Arduino Advanced Keypad Lock

This video shows you how to make a 4-digit code , with a reset button using an arduino. Comment below for any questions you have !

Here Is the Code :

#include //This is just for preview, dowload file to make it easier

#include LiquidCrystal_I2C lcd(0x3F, 16, 2);

const int button1 = 2; bool buttonState1 = LOW;

const int button2 = 3; bool buttonState2 = LOW;

const int button3 = 4; bool buttonState3 = LOW;

const int button4 = 5; bool buttonState4 = LOW;

const int correctPin = 8; const int passwordPin = 6; const int wrongPin = 7;

const int resetButton = 9;

bool resetButtonState = LOW;

const int newCodePin = 7;//10 const int passwordRecievePin = 6;//11 const int codeConfirmedPin = 8;//12

bool testState1 = LOW; bool testState2 = LOW; bool testState3 = HIGH;

int value1; int value2; int value3; int value4; int orderCheck = 1;

int pass1 = 1; int pass2 = 2; int pass3 = 3; int pass4 = 4;

void setup() { pinMode(button1, INPUT); pinMode(button2, INPUT); pinMode(button3, INPUT); pinMode(button4, INPUT);

pinMode(correctPin, OUTPUT); pinMode(passwordPin, OUTPUT); pinMode(wrongPin, OUTPUT);

pinMode(resetButton, INPUT);

pinMode(newCodePin, OUTPUT); pinMode(passwordRecievePin, OUTPUT); pinMode(codeConfirmedPin, OUTPUT);

Serial.begin(9600);

lcd.begin(); Wire.begin(); lcd.clear(); lcd.setCursor(0, 0); lcd.print("Enter the Code"); } void loop() { if (debounceButton(resetButtonState, resetButton) == HIGH && resetButtonState == LOW) { resetButtonState = HIGH; } else if (debounceButton(resetButtonState, resetButton) == LOW && resetButtonState == HIGH) { resetButtonState = LOW; if (testState1 == LOW) { testState1 = HIGH; testState3 = LOW; digitalWrite(newCodePin, HIGH); lcd.clear(); lcd.print("Enter Original"); lcd.setCursor(0, 1); lcd.print("Code");

} else if (testState1 == HIGH) { testState1 = LOW; testState3 = HIGH; digitalWrite(newCodePin, LOW); } } if (testState1 == HIGH) { if (debounceButton(buttonState1, button1) == HIGH || debounceButton(buttonState2, button2) == HIGH || debounceButton(buttonState3, button3) == HIGH || debounceButton(buttonState4, button4) == HIGH) {

switch (orderCheck) { case 1: {

if (debounceButton(buttonState1, button1) == HIGH ) { value1 = 1; orderCheck = 2; }

else if (debounceButton(buttonState2, button2) == HIGH) { value1 = 2; orderCheck = 2; }

else if (debounceButton(buttonState3, button3) == HIGH ) { value1 = 3; orderCheck = 2; }

else if (debounceButton(buttonState4, button4) == HIGH ) { value1 = 4; orderCheck = 2; } blink(); delay(500); break; } case 2: {

if (debounceButton(buttonState1, button1) == HIGH ) { value2 = 1; orderCheck = 3; }

else if (debounceButton(buttonState2, button2) == HIGH ) { value2 = 2; orderCheck = 3; }

else if (debounceButton(buttonState3, button3) == HIGH ) { value2 = 3; orderCheck = 3; }

else if (debounceButton(buttonState4, button4) == HIGH) { value2 = 4; orderCheck = 3; } blink(); delay(500); break; } case 3: {

if (debounceButton(buttonState1, button1) == HIGH ) { value3 = 1; orderCheck = 4; }

else if (debounceButton(buttonState2, button2) == HIGH) { value3 = 2; orderCheck = 4; }

else if (debounceButton(buttonState3, button3) == HIGH ) { value3 = 3; orderCheck = 4; }

else if (debounceButton(buttonState4, button4) == HIGH) { value3 = 4; orderCheck = 4; } blink(); delay(500); break; } case 4 : {

if (debounceButton(buttonState1, button1) == HIGH ) { value4 = 1; orderCheck = 5; }

else if (debounceButton(buttonState2, button2) == HIGH ) { value4 = 2; orderCheck = 5; }

else if (debounceButton(buttonState3, button3) == HIGH ) { value4 = 3; orderCheck = 5; }

else if (debounceButton(buttonState4, button4) == HIGH ) { value4 = 4; orderCheck = 5; } blink(); delay(500);

if (value1 == pass1 && value2 == pass2 && value3 == pass3 && value4 == pass4 && orderCheck == 5) { testState1 = LOW; testState2 = HIGH; digitalWrite(newCodePin, LOW); digitalWrite(passwordRecievePin, HIGH); lcd.clear(); lcd.print("Code accepted"); delay(1000); lcd.clear(); lcd.print("Enter new Code"); value1 = 0; value2 = 0; value3 = 0; value4 = 0; orderCheck = 1; } else if (orderCheck == 5) { orderCheck = 1; testState1 = LOW; testState3 = HIGH; value1 = 0; value2 = 0; value3 = 0; value4 = 0; lcd.clear(); lcd.print("Access Denied"); delay(1000); for (int x = 0; x < 3; x++) { digitalWrite(newCodePin, HIGH); delay(300); digitalWrite(newCodePin, LOW); delay(300); } lcd.clear(); lcd.print("Enter the Code"); break; } } } } } if (testState2 == HIGH) { if (debounceButton(buttonState1, button1) == HIGH || debounceButton(buttonState2, button2) == HIGH || debounceButton(buttonState3, button3) == HIGH || debounceButton(buttonState4, button4) == HIGH) {