Split Home Energy Meter features ESP32 with Microchip ATM90E32

Split Home Energy Meter features ESP32 with Microchip ATM90E32

Split Single Phase Energy Meter. Affordable remote energy monitoring for your entire home

The Split Single Phase Energy Meter can monitor the energy usage in your entire home in real time. It can easily be hooked up to an ESP8266 or ESP32 to wirelessly transmit energy usage data into a program like EmonCMS. It can also be used to monitor solar power generation to keep track of how much power you are making.

EmonCMS Android Screen

With the Split Single Phase Energy Meter you can:

  • Save Money!
    • See exactly how much money is being spent on energy in real time
    • Find appliances that are using too much electricity
  • View & Gather Energy Data
    • View the energy usage of your entire home
    • Or track solar power generation
    • Review and graph historical energy data
    • View usage data in the EmonCMS Android or iOS apps
  • Be Informed!
    • Independent of your power company’s meter
    • Set up alerts for over or under usage
  • Not spend a ton on energy monitoring!
    • Built to be inexpensive but very accurate
    • Costs hundreds less than some other solutions


  • Samples two current channels & one voltage channel (expandable to two voltage)
  • Calculates:
    • Active Power
    • Reactive Power
    • Apparent Power
    • Power Factor
    • Frequency
    • Temperature
  • Uses standard current transformer clamps to sample current
  • Includes built-in buck converter to power ESP8266, or ESP32
  • Two IRQ interrupts, and 1 Warning output
  • Energy pulse output (pulses correspond to 4 LEDs)
  • Zero crossing output
  • SPI Interface
  • Measurement Error: 0.1%
  • Dynamic Range: 6000:1
  • Gain Selection: Up to 4x
  • Voltage Reference Drift Typical (ppm/°C): 6
  • ADC Resolution (bits): 16
  • Compact size at only 40 mm x 50 mm

The project is going to be launched soon on www.crowdsupply.com. For updates, you can subscribe to the form on landing page.

Update 08/05/2019: Split single-phase energy meter just launched on Crowd Supply with a $6,300 funding target. If you only need the energy meter breakout board a $29 pledge will suffice, but most people will likely go with the $59 energy monitoring kit that  adds two YHDC SCT-016 120A CT Sensors, a pre-programmed ESP32 module, an ABS plastic box, the adapter board, and mounting screws. The power supply is not included, and can be added for $12 (120V, US only), or you may use your own.

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About mixos

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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Kaushal Kishore

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Nice, well pricedkit. But what is the benefit compared to using the ESP32’s own 6-channel ADC with a simple voltage splitter?

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