ESP8266 based AC power monitor

I created this AC power monitor that is based on a Wemos D1 Mini and a 100A:50mA split core current transformer. It reports real time power consumption to Home Assistant via ESPHome and displays the data on the i2c oled display.

You can find the ESPHome yaml here.

Parts list:

  • Wemos D1 mini (Amazon – US)
  • 3.5mm breakout (Amazon – US)
  • SCT-013-000 Non-invasive AC Current Sensor (Amazon – US)
  • i2c OLED Display (Amazon – US)


Print settings

  • Printer: Creality Ender 3v2 Neo
  • Filament: Anycubic white PLA (Amazon – US) Note: This is very nice filament.
  • Bed temperature: 60’c
  • Nozzle temperature: 200’c
  • Infill: 20%


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