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🔐 ESP8266 Digital Code Lock System A secure, DIY electronic locking system powered by the ESP8266 (NodeMCU). This project uses a matrix keypad for PIN entry, an I2C LCD for user feedback, and a relay module to control a high-voltage solenoid door bolt.
🚀 Features Secure PIN Entry: 4-digit master code validation.
Visual Feedback: 16x2 I2C LCD displays status messages ("Access Granted", "Invalid Code").
Privacy Mode: Masks input characters with * on the display.
Auto-Lock: Automatically re-engages the lock after a customizable delay.
Hardware Efficiency: Utilizes the ESP8266's GPIOs to handle an 8-pin keypad and I2C communication simultaneously.
🛠️ Hardware Requirements Microcontroller: ESP8266 (NodeMCU or Wemos D1 Mini).
Input: 4x4 Matrix Keypad.
Output: 16x2 LCD with I2C Backpack.
Actuator: 12V Solenoid Lock + 5V Relay Module.
Power: External 12V DC supply (to power the lock and ESP8266 via regulator).