Split Single Phase Real Time Whole House Energy Meter v1.2

$49.99 $39.99

7 in stock (can be backordered)

SKU: EM-E32AS Categories: ,


The CircuitSetup ATM90E32 Split Single Phase Real Time Whole House Energy Meter can easily be hooked up to an ESP8266 or ESP32 to wirelessly transmit energy usage data over your wifi network and into a program like EmonCMS.

The ATM90E32 IC from Microchip is versatile and affordable. We’ve put it on a 40x50mm PCB and connected all the useful bits, so it’s easy to hook up to an ESP or Arduino board of choice,  current transformers, and an ac transformer (for voltage & powering the board). From there, all you have to do is load the software on your MPU via the Arduino IDE to start seeing how much power your house is using!


  • Samples 2 current channels & 1 voltage channel (expandable to 2 voltage)
  • Calculates Active Power, Reactive Power, Apparent Power, Power Factor, Frequency, and Temp
  • Uses standard current transformer clamps to sample current
  • Includes buck converter to power ESP8266, or ESP32 (one AC transformer is required, which is used to sample current)
  • Can set warnings for over voltage & sag, over current, and frequency thresholds
  • 2 IRQ interrupts, and 1 Warning output
  • Energy pulse output (pulses also correspond to 4 LED’s)
  • 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
  • Size: 40x50mm
  • Intended for single split phase homes


What you’ll need:

  • Current Transformers:  SCT-013-000 (will have to cut off connectors and wire into the boards screw connectors) or Magnelab SCT-0750-100 (must sever burden resistor connection on the back of the board since they have a built in burden resistor)
  • AC Transformer: 9v or 12v
  • An ESP32 (ESP8266 or anything else that has an SPI interface)
  • Jumper wires with Dupont connectors to connect the two boards.
  • Software to load on your MPU using the Arduino IDE: EmonESP and ATM90E32_Arduino
  • EmonCMS (shown in pictures), ThingSpeak or similar

Additional information

Weight 2 oz
Dimensions 4 × 4 × 1 in


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