This project is an ESP32-based smart power monitoring and protection system that measures voltage, current, power, and temperature, and automatically trips the MCB using servo motors when overvoltage is detected. It also logs data to Firebase Realtime Database and sends SMS alerts via Air780E GSM Module.

Components Used Component Description ESP32 Main microcontroller for processing and Wi-Fi connection ZMPT101B Voltage Sensor Measures AC voltage ACS712 Current Sensor (30A) Measures AC current DS18B20 Temperature Sensor Measures temperature Air780E GSM Module Sends SMS alerts 16x2 I2C LCD Display Displays real-time readings Servo Motor x2 Controls MCB tripping and reset mechanism Buzzer Audible alarm on overvoltage Buck Step-Down Converter (5V) Powers servo motors and sensors Resistors, jumper wires, breadboard General circuit connections

Wiring Connections ESP32 Pin Mapping Module / Device Pin on ESP32 Notes ZMPT101B Voltage Sensor 34 Analog input ACS712 Current Sensor 32 Analog input DS18B20 Temperature Sensor 26 OneWire data pin (add 4.7kΩ pull-up resistor to 3.3V) Air780E GSM (RX) 4 Connects to TX of GSM module Air780E GSM (TX) 2 Connects to RX of GSM module Servo Motor 1 12 MCB switch servo 1 Servo Motor 2 13 MCB switch servo 2 Buzzer 5 Active buzzer output I2C LCD SDA 21 I2C data line I2C LCD SCL 22 I2C clock line 5V Power Supply VIN / External 5V Ensure enough current for servos