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Stromdings - 16-port smart power meter

Stromdings uses an ATMEGA328 microcontroller and four MCP3304 analog-digital converters to measure the power on up to 16 circuits using current transformers. Measurements are transmitted via WiFi to a home assistant server using mqtt.

Features:

  • Measure up to 16 ports
  • Up to 16A (3.6kW @ 230V) per port
  • Non-invasive installation using 'clip on' current transformer clamps
  • +/- 2 Watt accuracy
  • Transmit measurements via WiFi using MQTT

Software

Stromdings is an Arduino project, developed in VSCode using the PlatrormIO extension. It runs on an 16MHz ATMega328P microcontroller.

Requirements to the microcontroller:

  • Analog port with hardware pinchange interrupt
  • Two serial ports or support for software serial interface
  • Serial peripheral interface (SPI)
  • i2c bus

Used third party libraries:

Hardware

  • ATMega328P microcontroller
  • MCP3304 analog-digital converters
  • YHDC SCT-013 100A current transformers (1:2000 turns)
  • 220 Ohm shunt resistors for measurements up to 16A (3.6kW @ 230V) per port
  • ESP-01 WiFi module using ESP8266 chip
  • LCD Display with 16x2 characters via i2c
  • Rotary encoder to select displayed info on the LCD

Schematics / PCB design

Schematics and PCB was designed using the EasyEDA online editor. Schematics, PCB Design and final Gerber-Files are available in the 'doc' folder.

Schematics: https://github.com/xmirakulix/Stromdings/raw/master/doc/Schematics.pdf

PCB:

PCB

Ideas for the future

  • PCB: D1 orientation wrong
  • PCB: add reset button
  • PCB: Power cycle possibility for ESP-01
  • PCB: Optimize 2.5V ref voltage track routing
  • PCB: Check debounce cap necessity for rotary