Code & Circuit diagram for Keypad Arduino Security System
🔐 Arduino Keypad Security System
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💻 Arduino Code
Upload the following code to your Arduino using the Arduino IDE:
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#include <Keypad.h> char *password = "3690"; // Change this to modify password int position = 0; const byte ROWS = 4; const byte COLS = 4; char keys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = {13, 12, 11, 10}; byte colPins[COLS] = {9, 8, 7, 6}; Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS); int Lock = 5; // Relay connected to pin 5 void setup() { pinMode(Lock, OUTPUT); LockedPosition(true); } void loop() { char key = keypad.getKey(); if (key == '*' || key == 'A') { position = 0; LockedPosition(true); } if (key == password[position]) { position++; } if (position == 4) { // Change if password length increases LockedPosition(false); } delay(100); } void LockedPosition(int locked) { if (locked) { digitalWrite(Lock, LOW); } else { digitalWrite(Lock, HIGH); } } |
If you are getting a stray error, download the code from
here
.
🔌 Circuit Diagram
