Split Single Phase Real Time Whole House Energy Meter v1.4

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Frequently Bought Together

Jameco AC 120V 60Hz to AC 9 Volt Wall Adapter Transformer @ 1000mA Black Straight 2.5mm Female Plug

NodeMCU-32s - ESP32 ESP-WROOM-32 Development Board


Warranty: 90 Days

SKU: EM-E32AS Category: Tag:


The CircuitSetup ATM90E32 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.

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
    • Calculate energy usage for a single room to divide an energy bill fairly among roommates
  • View & Gather Energy Data
    • View the energy usage of your entire home
    • Track solar power generation (2 units required)
    • Calculate how much it costs to charge your electric vehicle
    • Remote energy monitoring for vacation or rental properties
    • Review and graph historical energy data
  • Be Informed!
    • Independent of your power utility’s meter
    • Set up alerts for over or under usage
    • Prevent surprises on energy bills
    • View usage data in the EmonCMS Android or iOS apps
    • Automate notifications with your home automation system like “send my phone a message when the dryer is done”, or even “if I leave the house, and the oven is on, send me an alert” (programming required)
  • Spend less on energy monitoring hardware!
    • Affordable but very accurate
    • Save hundreds over popular monitoring systems


  • Uses the Microchip ATM90E32AS
  • Samples 2 current channels & 1 voltage channel (expandable to 2 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
  • 2 IRQ interrupts, and 1 Warning output
  • Energy pulse output (pulses correspond to 4 LEDs)
  • Zero crossing output
  • SPI Interface
  • IC Measurement Error: 0.1%
  • IC Dynamic Range: 6000:1
  • Gain Selection: Up to 4x
  • Voltage Reference Drift Typical (ppm/°C): 6
  • ADC Resolution (bits): 16
  • Compact size at only 40x50mm


What you’ll need:

  • Current Transformers:
  • AC Transformer: Jameco Reliapro 9v
  • An ESP32 (ESP8266 or anything else that has an SPI interface & recommended wifi)
  • Jumper wires with Dupont connectors, or perf board to connect the two boards. An adapter board also comes with your purchase of a pre-programmed ESP32


Please see our Github repository for details on setting up software for the energy meter.

Additional information

Weight2 oz
Dimensions4 × 4 × 1 in
Board CT Connector

Quick Release Screw, 3.5mm Jack


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