An IOT Based Smart AC Electricity Meter with Tamper Protection

The IoT-Based Smart AC Electricity Meter operates by simultaneously monitoring power consumption parameters and physical security conditions around the metering unit. Powering the system is an HLK-5M05 AC-DC 5V converter, which steps down high-voltage AC mains to power the low-voltage logic circuitry centered around the Arduino Uno R4 WiFi. To measure electrical consumption, the ZMPT107 voltage sensor and ACS770LCB-050B current sensor interface with the AC line, providing analog signals that the microcontroller processes to calculate voltage, current, and overall power usage. A DS3231 Real-Time Clock provides precise timestamps for data logging, which is saved locally onto a Micro SD card module and displayed locally via a 1602 LCD screen using the I2C protocol. For remote tracking and visualization, the onboard ESP32-S3 module of the Uno R4 WiFi connects to the Blynk IoT platform over local Wi-Fi, syncing real-time energy data to the cloud. Tamper protection and environmental safety are handled by a multi-sensor array: an A3144 Hall-effect magnetic sensor detects unauthorized magnetic interference meant to trick mechanical meters, an SW-18015 vibration sensor registers physical impacts or drilling attempts, and a flame sensor detects fire hazards. If tampering or danger is identified, the system triggers a relay module (useful for disconnecting the load), lights up a WS2812B RGB LED for visual status alerts, and flags the event for remote monitoring.