From e7b02e999d54a3403fb6200a10f47106e2d55828 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C4=9Bj=20Kub=C3=AD=C4=8Dek?= <matej.kubicek@websitte.cz>
Date: Wed, 27 May 2026 09:08:40 +0200
Subject: [PATCH] =?UTF-8?q?P=C5=99id=C3=A1n=C3=AD=20obsluhy=20v=C5=A1ech?=
 =?UTF-8?q?=20=C4=8D=C3=A1st=C3=AD=20v=20p=C5=99=C3=ADslu=C5=A1n=C3=BDch?=
 =?UTF-8?q?=20souborech?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/.idea/editor.xml          | 245 ++++++++++++++++++++++++++++++++++
 src/include/ButtonInterrupt.h |  62 +++++++++
 src/include/CodeStorage.h     |  38 ++++++
 src/include/Display.h         |  73 ++++++++++
 src/include/Encoder.h         |  35 +++++
 src/include/Feedback.h        |  84 ++++++++++++
 src/include/Pins.h            |  16 +++
 src/include/VaultConfig.h     |  21 +++
 src/include/VaultState.h      |  96 +++++++++++++
 src/platformio.ini            |   4 +-
 src/src/main.cpp              |  21 ---
 src/src/main.ino              | 200 +++++++++++++++++++++++++++
 12 files changed, 873 insertions(+), 22 deletions(-)
 create mode 100644 src/include/ButtonInterrupt.h
 create mode 100644 src/include/CodeStorage.h
 create mode 100644 src/include/Display.h
 create mode 100644 src/include/Encoder.h
 create mode 100644 src/include/Feedback.h
 create mode 100644 src/include/Pins.h
 create mode 100644 src/include/VaultConfig.h
 create mode 100644 src/include/VaultState.h
 delete mode 100644 src/src/main.cpp
 create mode 100644 src/src/main.ino

diff --git a/src/.idea/editor.xml b/src/.idea/editor.xml
index ca29dcc..1798069 100644
--- a/src/.idea/editor.xml
+++ b/src/.idea/editor.xml
@@ -1,6 +1,251 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="BackendCodeEditorSettings">
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CDeclarationWithImplicitIntType/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CommentTypo/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=ConstevalIfIsAlwaysConstant/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppAbstractClassWithoutSpecifier/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppAbstractFinalClass/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppAbstractVirtualFunctionCallInCtor/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppAccessSpecifierWithNoDeclarations/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppAwaiterTypeIsNotClass/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBooleanIncrementExpression/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBoostFormatBadCode/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBoostFormatLegacyCode/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBoostFormatMixedArgs/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBoostFormatTooFewArgs/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBoostFormatTooManyArgs/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppCStyleCast/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppCVQualifierCanNotBeAppliedToReference/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassCanBeFinal/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassIsIncomplete/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassNeedsConstructorBecauseOfUninitializedMember/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppCompileTimeConstantCanBeReplacedWithBooleanConstant/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppConceptNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppConditionalExpressionCanBeSimplified/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppConstParameterInDeclaration/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppConstValueFunctionReturnType/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppCoroutineCallResolveError/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAArrayIndexOutOfBounds/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAConstantConditions/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAConstantFunctionResult/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAConstantParameter/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFADeletedPointer/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAEndlessLoop/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAInfiniteRecursion/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAInvalidatedMemory/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFALocalValueEscapesFunction/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFALocalValueEscapesScope/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFALoopConditionNotUpdated/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAMemoryLeak/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFANotInitializedField/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFANullDereference/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFATimeOver/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAUnreachableCode/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAUnreachableFunctionCall/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAUnreadVariable/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDFAUnusedValue/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeclarationHidesLocal/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeclarationHidesUncapturedLocal/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeclarationSpecifierWithoutDeclarators/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeclaratorDisambiguatedAsFunction/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeclaratorNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeclaratorUsedBeforeInitialization/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDefaultCaseNotHandledInSwitchStatement/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDefaultInitializationWithNoUserConstructor/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDefaultIsUsedAsIdentifier/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDefaultedSpecialMemberFunctionIsImplicitlyDeleted/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDefinitionsOrder/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeletingVoidPointer/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDependentTemplateWithoutTemplateKeyword/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDependentTypeWithoutTypenameKeyword/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeprecatedEntity/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeprecatedOverridenMethod/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDeprecatedRegisterStorageClassSpecifier/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDereferenceOperatorLimitExceeded/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDiscardedPostfixOperatorResult/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDoxygenSyntaxError/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDoxygenUndocumentedParameter/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppDoxygenUnresolvedReference/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEmptyDeclaration/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceCVQualifiersOrder/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceCVQualifiersPlacement/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceDoStatementBraces/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceForStatementBraces/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceFunctionDeclarationStyle/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceIfStatementBraces/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceNestedNamespacesStyle/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceOverridingDestructorStyle/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceOverridingFunctionStyle/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceTypeAliasCodeStyle/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnforceWhileStatementBraces/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEntityAssignedButNoRead/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEntityUsedOnlyInUnevaluatedContext/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEnumeratorNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEqualOperandsInBinaryExpression/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppEvaluationFailure/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppExplicitSpecializationInNonNamespaceScope/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppExpressionWithoutSideEffects/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppFinalFunctionInFinalClass/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppFinalNonOverridingVirtualFunction/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppForLoopCanBeReplacedWithWhile/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppForwardEnumDeclarationWithoutUnderlyingType/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppFunctionDoesntReturnValue/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppFunctionIsNotImplemented/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppFunctionResultShouldBeUsed/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppFunctionalStyleCast/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppHeaderHasBeenAlreadyIncluded/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppHiddenFunction/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppHidingFunction/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppIdenticalOperandsInBinaryExpression/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppIfCanBeReplacedByConstexprIf/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppImplicitDefaultConstructorNotAvailable/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppIncompatiblePointerConversion/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppIncompleteSwitchStatement/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppInconsistentNaming/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppIntegralToPointerConversion/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppInvalidLineContinuation/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppJoinDeclarationAndAssignment/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppLambdaCaptureNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppLocalVariableMayBeConst/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppLocalVariableMightNotBeInitialized/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppLocalVariableWithNonTrivialDtorIsNeverUsed/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppLongFloat/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMemberFunctionMayBeConst/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMemberFunctionMayBeStatic/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMemberInitializersOrder/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMismatchedClassTags/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMissingIncludeGuard/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMissingKeywordThrow/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppModulePartitionWithSeveralPartitionUnits/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMsExtAddressOfClassRValue/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMsExtBindingRValueToLvalueReference/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMsExtCopyElisionInCopyInitDeclarator/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMsExtDoubleUserConversionInCopyInit/@EntryIndexedValue" value="WARNING" type="string" />
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+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMsExtReinterpretCastFromNullptr/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMultiCharacterLiteral/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMultiCharacterWideLiteral/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMustBePublicVirtualToImplementInterface/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppMutableSpecifierOnReferenceMember/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppNoDiscardExpression/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppNodiscardFunctionWithoutReturnValue/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppNonExceptionSafeResourceAcquisition/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppNonExplicitConversionOperator/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppNonExplicitConvertingConstructor/@EntryIndexedValue" value="HINT" type="string" />
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+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppObjectMemberMightNotBeInitialized/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppOutParameterMustBeWritten/@EntryIndexedValue" value="WARNING" type="string" />
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+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterMayBeConst/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterMayBeConstPtrOrRef/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterNamesMismatch/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppParameterNeverUsed/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPassValueParameterByConstReference/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPointerConversionDropsQualifiers/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPointerToIntegralConversion/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPolymorphicClassWithNonVirtualPublicDestructor/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPossiblyErroneousEmptyStatements/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPossiblyUninitializedMember/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPossiblyUnintendedObjectSlicing/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrecompiledHeaderIsNotIncluded/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrecompiledHeaderNotFound/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrintfBadFormat/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrintfExtraArg/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrintfMissedArg/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrintfRiskyFormat/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppPrivateSpecialMemberFunctionIsNotImplemented/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRangeBasedForIncompatibleReference/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedefinitionOfDefaultArgumentInOverrideFunction/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantAccessSpecifier/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantBaseClassAccessSpecifier/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantBaseClassInitializer/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantBooleanExpressionArgument/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantCastExpression/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantComplexityInComparison/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantConditionalExpression/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantConstSpecifier/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantControlFlowJump/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantDereferencingAndTakingAddress/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantElaboratedTypeSpecifier/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantElseKeyword/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantElseKeywordInsideCompoundStatement/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantEmptyDeclaration/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantEmptyStatement/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantExportKeyword/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantFwdClassOrEnumSpecifier/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantInlineSpecifier/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantLambdaParameterList/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantMemberInitializer/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantNamespaceDefinition/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantParentheses/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantQualifier/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantQualifierADL/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantStaticSpecifierOnMemberAllocationFunction/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantStaticSpecifierOnThreadLocalLocalVariable/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantTemplateArguments/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantTemplateKeyword/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantTypenameKeyword/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantVoidArgumentList/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRedundantZeroInitializerInAggregateInitialization/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppReinterpretCastFromVoidPtr/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppRemoveRedundantBraces/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppReplaceMemsetWithZeroInitialization/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppReplaceTieWithStructuredBinding/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppReturnNoValueInNonVoidFunction/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppSmartPointerVsMakeFunction/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppSomeObjectMembersMightNotBeInitialized/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppSpecialFunctionWithoutNoexceptSpecification/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStaticAssertFailure/@EntryIndexedValue" value="ERROR" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStaticDataMemberInUnnamedStruct/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStaticSpecifierOnAnonymousNamespaceMember/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStringLiteralToCharPointerConversion/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTabsAreDisallowed/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTemplateArgumentsCanBeDeduced/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTemplateParameterNeverUsed/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTemplateParameterShadowing/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppThrowExpressionCanBeReplacedWithRethrow/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTooWideScope/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTooWideScopeInitStatement/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTypeAliasNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUninitializedDependentBaseClass/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUninitializedNonStaticDataMember/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnionMemberOfReferenceType/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnmatchedPragmaEndRegionDirective/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnmatchedPragmaRegionDirective/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnnamedNamespaceInHeaderFile/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnnecessaryWhitespace/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnsignedZeroComparison/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnusedIncludeDirective/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseAlgorithmWithCount/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseAssociativeContains/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseAuto/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseAutoForNumeric/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseElementsView/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseEraseAlgorithm/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseFamiliarTemplateSyntaxForGenericLambdas/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseRangeAlgorithm/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseStdSize/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseStructuredBinding/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseTypeTraitAlias/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUserDefinedLiteralSuffixDoesNotStartWithUnderscore/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUsingResultOfAssignmentAsCondition/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppVariableCanBeMadeConstexpr/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppVirtualFunctionCallInsideCtor/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppVirtualFunctionInFinalClass/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppVolatileParameterInDeclaration/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppWarningDirective/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppWrongIncludesOrder/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppWrongSlashesInIncludeDirective/@EntryIndexedValue" value="HINT" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppZeroConstantCanBeReplacedWithNullptr/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppZeroValuedExpressionUsedAsNullPointer/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=IdentifierTypo/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=IfStdIsConstantEvaluatedCanBeReplaced/@EntryIndexedValue" value="SUGGESTION" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=StdIsConstantEvaluatedWillAlwaysEvaluateToConstant/@EntryIndexedValue" value="WARNING" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=StringLiteralTypo/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
     <option name="/Default/CodeStyle/CodeFormatting/CppClangFormat/EnableClangFormatSupport/@EntryValue" value="false" type="bool" />
     <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_ARGUMENT/@EntryValue" value="true" type="bool" />
     <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_BINARY_EXPRESSIONS_CHAIN/@EntryValue" value="true" type="bool" />
diff --git a/src/include/ButtonInterrupt.h b/src/include/ButtonInterrupt.h
new file mode 100644
index 0000000..84310de
--- /dev/null
+++ b/src/include/ButtonInterrupt.h
@@ -0,0 +1,62 @@
+#pragma once
+
+#include <Arduino.h>
+
+class InterruptButton {
+public:
+    explicit InterruptButton(byte pin)
+        : _pin(pin), _lastPressMs(0) {
+    }
+
+    void begin() {
+        pinMode(_pin, INPUT_PULLUP);
+        _instance = this;
+        attachInterrupt(digitalPinToInterrupt(_pin), InterruptButton::isrRouter, FALLING);
+    }
+
+    bool consumePress() {
+        bool pending = false;
+        noInterrupts();
+        if (_pendingInterrupt) {
+            pending = true;
+            _pendingInterrupt = false;
+        }
+        interrupts();
+
+        if (!pending) {
+            return false;
+        }
+
+        const uint32_t now = millis();
+        if (now - _lastPressMs < BUTTON_DEBOUNCE_MS) {
+            return false;
+        }
+        _lastPressMs = now;
+        return true;
+    }
+
+    void clearPending() {
+        noInterrupts();
+        _pendingInterrupt = false;
+        interrupts();
+    }
+
+    bool isPressedRaw() const {
+        return digitalRead(_pin) == LOW;
+    }
+
+private:
+    static constexpr uint32_t BUTTON_DEBOUNCE_MS = 170;
+
+    static void isrRouter() {
+        if (_instance != nullptr) {
+            _pendingInterrupt = true;
+        }
+    }
+
+    inline static InterruptButton *_instance = nullptr;
+    inline static volatile bool _pendingInterrupt = false;
+
+    byte _pin;
+    uint32_t _lastPressMs;
+};
diff --git a/src/include/CodeStorage.h b/src/include/CodeStorage.h
new file mode 100644
index 0000000..8b33727
--- /dev/null
+++ b/src/include/CodeStorage.h
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <EEPROM.h>
+
+#include <array>
+#include <cstdint>
+
+#include "VaultConfig.h"
+
+inline bool loadStoredCode(std::array<uint8_t, CODE_LENGTH> &code) {
+    constexpr int STORAGE_MAGIC_ADDR = 0;
+    constexpr int STORAGE_CODE_ADDR = 1;
+    constexpr uint8_t STORAGE_MAGIC = 0x5A;
+
+    if (EEPROM.read(STORAGE_MAGIC_ADDR) != STORAGE_MAGIC) {
+        return false;
+    }
+
+    for (std::size_t i = 0; i < CODE_LENGTH; ++i) {
+        const uint8_t digit = EEPROM.read(STORAGE_CODE_ADDR + static_cast<int>(i));
+        if (digit > DIGIT_MAX) {
+            return false;
+        }
+        code[i] = digit;
+    }
+    return true;
+}
+
+inline void saveStoredCode(const std::array<uint8_t, CODE_LENGTH> &code) {
+    constexpr int STORAGE_MAGIC_ADDR = 0;
+    constexpr int STORAGE_CODE_ADDR = 1;
+    constexpr uint8_t STORAGE_MAGIC = 0x5A;
+
+    EEPROM.update(STORAGE_MAGIC_ADDR, STORAGE_MAGIC);
+    for (std::size_t i = 0; i < CODE_LENGTH; ++i) {
+        EEPROM.update(STORAGE_CODE_ADDR + static_cast<int>(i), code[i]);
+    }
+}
diff --git a/src/include/Display.h b/src/include/Display.h
new file mode 100644
index 0000000..bd4c7c3
--- /dev/null
+++ b/src/include/Display.h
@@ -0,0 +1,73 @@
+#pragma once
+
+#include <Arduino.h>
+#include <LiquidCrystal_I2C.h>
+
+#include <cstdio>
+
+#include "VaultConfig.h"
+
+class DisplayController {
+public:
+    DisplayController()
+        : _lcd(LCD_ADDR, LCD_COLS, LCD_ROWS) {
+    }
+
+    void begin() {
+        _lcd.init();
+        _lcd.backlight();
+        showMessage("Elektronicky", "trezor ready");
+    }
+
+    void showEntry(uint8_t selectedDigit, std::size_t enteredLength) {
+        char line1[17];
+        char line2[17];
+
+        snprintf(line1, sizeof(line1), "Kod: %c%c%c%c",
+                 enteredLength > 0 ? '*' : '_',
+                 enteredLength > 1 ? '*' : '_',
+                 enteredLength > 2 ? '*' : '_',
+                 enteredLength > 3 ? '*' : '_');
+        snprintf(line2, sizeof(line2), "Cislice: %u", selectedDigit);
+
+        writePadded(0, line1);
+        writePadded(1, line2);
+    }
+
+    void showSetup(uint8_t selectedDigit, std::size_t enteredLength) {
+        char line1[17];
+        char line2[17];
+
+        snprintf(line1, sizeof(line1), "Novy kod: %c%c%c%c",
+                 enteredLength > 0 ? '*' : '_',
+                 enteredLength > 1 ? '*' : '_',
+                 enteredLength > 2 ? '*' : '_',
+                 enteredLength > 3 ? '*' : '_');
+        snprintf(line2, sizeof(line2), "Vyber: %u", selectedDigit);
+
+        writePadded(0, line1);
+        writePadded(1, line2);
+    }
+
+    void showLockout(uint32_t remainingSeconds) {
+        char line2[17];
+        writePadded(0, "LOCKOUT");
+        snprintf(line2, sizeof(line2), "Cekej %lus", static_cast<unsigned long>(remainingSeconds));
+        writePadded(1, line2);
+    }
+
+    void showMessage(const char *line1, const char *line2) {
+        writePadded(0, line1);
+        writePadded(1, line2);
+    }
+
+private:
+    void writePadded(uint8_t row, const char *text) {
+        _lcd.setCursor(0, row);
+        _lcd.print("                ");
+        _lcd.setCursor(0, row);
+        _lcd.print(text);
+    }
+
+    LiquidCrystal_I2C _lcd;
+};
diff --git a/src/include/Encoder.h b/src/include/Encoder.h
new file mode 100644
index 0000000..511ed0f
--- /dev/null
+++ b/src/include/Encoder.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <Arduino.h>
+
+class RotaryEncoder {
+public:
+    RotaryEncoder(byte clkPin, byte dtPin)
+        : _clkPin(clkPin), _dtPin(dtPin), _lastClk(HIGH) {
+    }
+
+    void begin() {
+        pinMode(_clkPin, INPUT_PULLUP);
+        pinMode(_dtPin, INPUT_PULLUP);
+        _lastClk = digitalRead(_clkPin);
+    }
+
+    // -1 = vlevo, +1 = vpravo, 0 = bez změny
+    int8_t readStep() {
+        const int clkState = digitalRead(_clkPin);
+        int8_t step = 0;
+
+        if (clkState != _lastClk && clkState == LOW) {
+            const int dtState = digitalRead(_dtPin);
+            step = (dtState != clkState) ? 1 : -1;
+        }
+
+        _lastClk = clkState;
+        return step;
+    }
+
+private:
+    byte _clkPin;
+    byte _dtPin;
+    int _lastClk;
+};
diff --git a/src/include/Feedback.h b/src/include/Feedback.h
new file mode 100644
index 0000000..f8042e8
--- /dev/null
+++ b/src/include/Feedback.h
@@ -0,0 +1,84 @@
+#pragma once
+
+#include <Arduino.h>
+#include <Servo.h>
+
+class FeedbackController {
+public:
+    FeedbackController(byte servoPin, byte redPin, byte greenPin, byte bluePin, byte buzzerPin)
+        : _servoPin(servoPin), _redPin(redPin), _greenPin(greenPin), _bluePin(bluePin), _buzzerPin(buzzerPin) {
+    }
+
+    void begin(uint8_t lockedAngle) {
+        pinMode(_redPin, OUTPUT);
+        pinMode(_greenPin, OUTPUT);
+        pinMode(_bluePin, OUTPUT);
+        pinMode(_buzzerPin, OUTPUT);
+
+        _servo.attach(_servoPin);
+        lock(lockedAngle);
+        ledOff();
+    }
+
+    void lock(uint8_t angle) {
+        _servo.write(angle);
+    }
+
+    void unlock(uint8_t angle) {
+        _servo.write(angle);
+    }
+
+    void ledOff() {
+        setRgb(0, 0, 0);
+    }
+
+    void onCorrectCode(uint8_t unlockAngle) {
+        unlock(unlockAngle);
+        setRgb(0, 255, 0);
+        playSuccessMelody();
+    }
+
+    void onWrongCode() {
+        for (uint8_t i = 0; i < 3; ++i) {
+            setRgb(255, 0, 0);
+            delay(140);
+            ledOff();
+            delay(110);
+        }
+        playAlarm();
+    }
+
+private:
+    void setRgb(uint8_t red, uint8_t green, uint8_t blue) {
+        analogWrite(_redPin, red);
+        analogWrite(_greenPin, green);
+        analogWrite(_bluePin, blue);
+    }
+
+    void playSuccessMelody() {
+        tone(_buzzerPin, 784, 100);
+        delay(130);
+        tone(_buzzerPin, 988, 100);
+        delay(130);
+        tone(_buzzerPin, 1319, 170);
+        delay(190);
+        noTone(_buzzerPin);
+    }
+
+    void playAlarm() {
+        for (uint8_t i = 0; i < 2; ++i) {
+            tone(_buzzerPin, 220);
+            delay(250);
+            tone(_buzzerPin, 180);
+            delay(250);
+        }
+        noTone(_buzzerPin);
+    }
+
+    byte _servoPin;
+    byte _redPin;
+    byte _greenPin;
+    byte _bluePin;
+    byte _buzzerPin;
+    Servo _servo;
+};
diff --git a/src/include/Pins.h b/src/include/Pins.h
new file mode 100644
index 0000000..4f98037
--- /dev/null
+++ b/src/include/Pins.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <Arduino.h>
+
+constexpr byte BTN_PIN = 6; // tlačítko, druhý pin na GND
+constexpr byte ENCODER_CLK_PIN = 8;
+constexpr byte ENCODER_DT_PIN = 9;
+constexpr byte ENCODER_SW_PIN = 12; // volitelný SW na enkodéru
+
+// RGB LED common cathode
+constexpr byte RGB_G_PIN = 3;
+constexpr byte RGB_R_PIN = 5;
+constexpr byte RGB_B_PIN = 11;
+
+constexpr byte SERVO_PWM_PIN = 10;
+constexpr byte BUZZER_PIN = 7;
diff --git a/src/include/VaultConfig.h b/src/include/VaultConfig.h
new file mode 100644
index 0000000..48129f4
--- /dev/null
+++ b/src/include/VaultConfig.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+
+constexpr std::size_t CODE_LENGTH = 4;
+constexpr uint8_t MAX_FAILED_ATTEMPTS = 3;
+constexpr uint32_t LOCKOUT_MS = 30'000;
+
+constexpr uint8_t DIGIT_MIN = 0;
+constexpr uint8_t DIGIT_MAX = 9;
+
+constexpr uint8_t SERVO_LOCKED_ANGLE = 5;
+constexpr uint8_t SERVO_UNLOCKED_ANGLE = 95;
+constexpr uint32_t UNLOCK_VISIBLE_MS = 5000;
+
+constexpr uint8_t LCD_ADDR = 0x27;
+constexpr uint8_t LCD_COLS = 16;
+constexpr uint8_t LCD_ROWS = 2;
+
+constexpr std::array<uint8_t, CODE_LENGTH> DEFAULT_CODE = {1, 2, 3, 4};
diff --git a/src/include/VaultState.h b/src/include/VaultState.h
new file mode 100644
index 0000000..0c838a3
--- /dev/null
+++ b/src/include/VaultState.h
@@ -0,0 +1,96 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+
+#include "VaultConfig.h"
+
+enum class SubmitResult : uint8_t {
+    DigitAccepted,
+    CorrectCode,
+    WrongCode,
+    LockedOut,
+    InvalidDigit
+};
+
+class VaultState {
+public:
+    VaultState() : _code(DEFAULT_CODE), _entry{}, _entryLength(0), _failedAttempts(0), _lockoutUntilMs(0) {
+    }
+
+    void setCode(const std::array<uint8_t, CODE_LENGTH> &code) {
+        _code = code;
+    }
+
+    const std::array<uint8_t, CODE_LENGTH> &code() const {
+        return _code;
+    }
+
+    SubmitResult pushDigit(uint8_t digit, uint32_t nowMs) {
+        if (isLockedOut(nowMs)) {
+            return SubmitResult::LockedOut;
+        }
+        if (digit < DIGIT_MIN || digit > DIGIT_MAX) {
+            return SubmitResult::InvalidDigit;
+        }
+        if (_entryLength < CODE_LENGTH) {
+            _entry[_entryLength++] = digit;
+        }
+
+        if (_entryLength < CODE_LENGTH) {
+            return SubmitResult::DigitAccepted;
+        }
+
+        const bool ok = (_entry == _code);
+        clearEntry();
+
+        if (ok) {
+            _failedAttempts = 0;
+            return SubmitResult::CorrectCode;
+        }
+
+        ++_failedAttempts;
+        if (_failedAttempts >= MAX_FAILED_ATTEMPTS) {
+            _failedAttempts = 0;
+            _lockoutUntilMs = nowMs + LOCKOUT_MS;
+        }
+        return SubmitResult::WrongCode;
+    }
+
+    bool isLockedOut(uint32_t nowMs) const {
+        return nowMs < _lockoutUntilMs;
+    }
+
+    uint32_t lockoutRemainingMs(uint32_t nowMs) const {
+        if (!isLockedOut(nowMs)) {
+            return 0;
+        }
+        return _lockoutUntilMs - nowMs;
+    }
+
+    void clearEntry() {
+        _entry.fill(0);
+        _entryLength = 0;
+    }
+
+    std::size_t enteredLength() const {
+        return _entryLength;
+    }
+
+    uint8_t failedAttempts() const {
+        return _failedAttempts;
+    }
+
+    void resetLockout() {
+        _lockoutUntilMs = 0;
+        _failedAttempts = 0;
+        clearEntry();
+    }
+
+private:
+    std::array<uint8_t, CODE_LENGTH> _code;
+    std::array<uint8_t, CODE_LENGTH> _entry;
+    std::size_t _entryLength;
+    uint8_t _failedAttempts;
+    uint32_t _lockoutUntilMs;
+};
diff --git a/src/platformio.ini b/src/platformio.ini
index 2caf42c..2377f51 100644
--- a/src/platformio.ini
+++ b/src/platformio.ini
@@ -12,4 +12,6 @@
 platform = renesas-ra
 board = uno_r4_wifi
 framework = arduino
-lib_deps = marcoschwartz/LiquidCrystal_I2C@^1.1.4
+lib_deps =
+  marcoschwartz/LiquidCrystal_I2C@^1.1.4
+  arduino-libraries/Servo@^1.2.2
diff --git a/src/src/main.cpp b/src/src/main.cpp
deleted file mode 100644
index 722c928..0000000
--- a/src/src/main.cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-#include <Arduino.h>
-
-constexpr byte BTN = 6; // connected to GND on the other side
-constexpr byte ENCODER_CLK = 8;
-constexpr byte ENCODER_DT = 9;
-constexpr byte ENCODER_SW = 12;
-
-// common cathode
-constexpr byte RGB_G = 3;
-constexpr byte RGB_R = 5;
-constexpr byte RGB_B = 11;
-
-constexpr byte SERVO_PWM = 10;
-
-void setup() {
-
-}
-
-void loop() {
-
-}
\ No newline at end of file
diff --git a/src/src/main.ino b/src/src/main.ino
new file mode 100644
index 0000000..de06899
--- /dev/null
+++ b/src/src/main.ino
@@ -0,0 +1,200 @@
+#include <Arduino.h>
+
+#include <array>
+
+#include "ButtonInterrupt.h"
+#include "CodeStorage.h"
+#include "Display.h"
+#include "Encoder.h"
+#include "Feedback.h"
+#include "Pins.h"
+#include "VaultConfig.h"
+#include "VaultState.h"
+
+enum class Mode : uint8_t {
+    EnterCode,
+    SetupCode,
+    Unlocked,
+    Lockout
+};
+
+VaultState vault;
+RotaryEncoder encoder(ENCODER_CLK_PIN, ENCODER_DT_PIN);
+InterruptButton button(BTN_PIN);
+DisplayController display;
+FeedbackController feedback(SERVO_PWM_PIN, RGB_R_PIN, RGB_G_PIN, RGB_B_PIN, BUZZER_PIN);
+
+Mode mode = Mode::EnterCode;
+uint8_t selectedDigit = 0;
+std::array<uint8_t, CODE_LENGTH> setupCode = {0, 0, 0, 0};
+std::size_t setupDigitsEntered = 0;
+uint32_t unlockedUntil = 0;
+
+void handleSerialCommands() {
+    if (!Serial.available()) {
+        return;
+    }
+
+    String cmd = Serial.readStringUntil('\n');
+    cmd.trim();
+    cmd.toUpperCase();
+
+    if (cmd == "RESET") {
+        vault.resetLockout();
+        mode = Mode::EnterCode;
+        display.showMessage("Reset lockout", "Zadej kod");
+        delay(550);
+    }
+}
+
+void moveSelectedDigit(int8_t step) {
+    if (step == 0) {
+        return;
+    }
+
+    int16_t next = static_cast<int16_t>(selectedDigit) + step;
+    if (next > DIGIT_MAX) {
+        next = DIGIT_MIN;
+    } else if (next < DIGIT_MIN) {
+        next = DIGIT_MAX;
+    }
+    selectedDigit = static_cast<uint8_t>(next);
+}
+
+void setupModeTick() {
+    if (button.consumePress()) {
+        setupCode[setupDigitsEntered++] = selectedDigit;
+    }
+
+    if (setupDigitsEntered >= CODE_LENGTH) {
+        saveStoredCode(setupCode);
+        vault.setCode(setupCode);
+        vault.resetLockout();
+
+        feedback.lock(SERVO_LOCKED_ANGLE);
+        feedback.ledOff();
+
+        display.showMessage("Kod ulozen", "Zadej novy kod");
+        delay(1000);
+
+        setupDigitsEntered = 0;
+        selectedDigit = 0;
+        mode = Mode::EnterCode;
+        return;
+    }
+
+    display.showSetup(selectedDigit, setupDigitsEntered);
+}
+
+void enterCodeModeTick(uint32_t nowMs) {
+    if (vault.isLockedOut(nowMs)) {
+        mode = Mode::Lockout;
+        return;
+    }
+
+    if (button.consumePress()) {
+        const SubmitResult result = vault.pushDigit(selectedDigit, nowMs);
+
+        if (result == SubmitResult::CorrectCode) {
+            feedback.onCorrectCode(SERVO_UNLOCKED_ANGLE);
+            display.showMessage("Kod spravny", "Trezor odemcen");
+            unlockedUntil = nowMs + UNLOCK_VISIBLE_MS;
+            mode = Mode::Unlocked;
+            return;
+        }
+
+        if (result == SubmitResult::WrongCode) {
+            feedback.onWrongCode();
+            if (vault.isLockedOut(nowMs)) {
+                mode = Mode::Lockout;
+                return;
+            }
+            display.showMessage("Spatny kod", "Zkus to znovu");
+            delay(800);
+        }
+    }
+
+    display.showEntry(selectedDigit, vault.enteredLength());
+}
+
+void unlockedModeTick(uint32_t nowMs) {
+    if (nowMs >= unlockedUntil) {
+        feedback.lock(SERVO_LOCKED_ANGLE);
+        feedback.ledOff();
+        mode = Mode::EnterCode;
+        return;
+    }
+
+    display.showMessage("Trezor odemcen", "Pristup povolen");
+}
+
+void lockoutModeTick(uint32_t nowMs) {
+    if (!vault.isLockedOut(nowMs)) {
+        feedback.lock(SERVO_LOCKED_ANGLE);
+        feedback.ledOff();
+        mode = Mode::EnterCode;
+        return;
+    }
+
+    const uint32_t remainingMs = vault.lockoutRemainingMs(nowMs);
+    const uint32_t remainingSec = (remainingMs + 999) / 1000;
+    display.showLockout(remainingSec);
+}
+
+void setup() {
+    Serial.begin(115200);
+
+    pinMode(BTN_PIN, INPUT_PULLUP);
+    const bool setupRequestedAtBoot = (digitalRead(BTN_PIN) == LOW);
+
+    encoder.begin();
+    button.begin();
+    button.clearPending();
+
+    feedback.begin(SERVO_LOCKED_ANGLE);
+    display.begin();
+
+    std::array<uint8_t, CODE_LENGTH> loadedCode = {0, 0, 0, 0};
+    if (loadStoredCode(loadedCode)) {
+        vault.setCode(loadedCode);
+    } else {
+        vault.setCode(DEFAULT_CODE);
+        saveStoredCode(DEFAULT_CODE);
+    }
+
+    if (setupRequestedAtBoot) {
+        mode = Mode::SetupCode;
+        display.showMessage("SETUP rezim", "Nastav novy kod");
+        delay(900);
+    } else {
+        mode = Mode::EnterCode;
+        display.showMessage("Zadej kod", "Otoc + tlacitko");
+        delay(800);
+    }
+
+    Serial.println("Prikaz pro reset lockoutu: RESET");
+}
+
+void loop() {
+    handleSerialCommands();
+
+    moveSelectedDigit(encoder.readStep());
+    const uint32_t nowMs = millis();
+
+    switch (mode) {
+        case Mode::SetupCode:
+            setupModeTick();
+            break;
+        case Mode::EnterCode:
+            enterCodeModeTick(nowMs);
+            break;
+        case Mode::Unlocked:
+            unlockedModeTick(nowMs);
+            break;
+        case Mode::Lockout:
+            lockoutModeTick(nowMs);
+            break;
+    }
+
+    delay(20);
+}
\ No newline at end of file