DIY Arduino Digital Code Lock 2


Components required :

1) 1 x Arduino Uno R3 Board (Buy here) or 1 x Arduino Development Board (Buy here)  
2) 1 x 16×2 LCD with Breakout Board (Buy here)
3) 1 x 170 Point BreadBoard (Buy here)
4) 1 x Single Channel 5V Relay Module (Buy here)
5) 1 x 4*4 Keypad Matrix (Buy here)
6) 1 x 5V Small Buzzer (Buy here)

1) Power Source (Battery with Snapper/DC Adapter) : 9-12V DC (Buy here)
2) Tools (Buy here)
3) Jumper Wires (Buy here)

Download Codes & Circuit Diagram.  

In case of any questions or queries, feel free to post below.

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  1. How do you edit the password without changing the code?

    1. Hello Patrick,
      For that, you’ll have to store the password in EEPROM and update it using EEPROM Write functions.
      It’ll involve modifying the original code.

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