ESP32 + light sensor sensor = electricity meter in InfluxDB

Written in MicroPython. Use something like a LM393 photodiode light sensors and attach it to your electricity meter.

Installation

• Download MicroPython here
• Then flash it to your microcontroller, ESP32 for example:

esptool.py -p /dev/ttyACM0 erase_flash
esptool.py -p /dev/ttyACM0 --baud 460800 write_flash 0 ESP32_GENERIC_C3-20251209-v1.27.0.bin

Use Thonny (graphical IDE) or ampy (CLI) to flash the files to the microcontroller.

Example with ampy:

ampy --port /dev/ttyACM0 put config.py
ampy --port /dev/ttyACM0 put main.py

Attach the light sensors directly on the impuslse LED on you electricity meter like this:

You can display the values saved in InfluxDB using Grafana like this if you like: