Split Single-phase Energy Meter

by CircuitSetup

Affordable remote energy monitoring for your entire home

View all updates Jul 07, 2019

Testing and Ordering

The past couple weeks has been consumed with getting every last detail ironed over. Testing hardware and improving software has taken up most of that time. Not to mention drilling 600 holes in the first 100 kit boxes with the help of special plastic drill bits, and 3d printed templates!

Unfortunately, we are not on schedule to have everything delivered by July 15th. There were some details overlooked that prevented this from happening. For example, we mistakenly thought that we could use a certain connector for the kits that joins the ESP32 to the PCB. As it turns out, because of limited head room in the kit box, this connector has to be custom ordered, and it’ll take two weeks to make. These were ordered last week and should be at PCBWay by next week. We apologize for this oversight and hope to make it up through better software.

Production on the actual energy meter boards will begin next week, and will be completed within 2 - 3 weeks time. Everything else we either already have, or has been shipped, including the custom current transformers with 3.5 mm jacks.

That being said, the other big thing is a substantial improvement to the default software that runs on the ESP32, EmonESP. There were admittedly some missing features and/or bugs. For example:

  • The ability to able to change voltage & current calibration values without recompiling everything
  • Through testing we found that the ESP32 would have a hard time reconnecting to WiFi if the signal was lost, and would sometimes lock up
  • No way to change what WiFi network it was on without resetting everything in EmonESP
  • The ability to update firmware from the web interface without downloading and recompiling everything, despite there being a button to do so

All of these features are now available in our version of EmonESP!

If you plan on running different software to gather energy data from the energy meter, there are already several new options, including libraries for MicroPython, CircuitPython, and integration into ESPHome, which can be used to easily get data directly into Home Assistant, and other home automation systems! Many thanks to those that have already contributed to the software!

That’s all for now! Be sure to watch our Github project page if you haven’t already!

$29,612 raised

of $6,300 goal

470% Funded! Order Below

Product Choices


Energy Meter Board

Perfect for building your own energy monitoring system. Hook up our energy meter to your MCU, current & AC transformers, load the software, and start monitoring!


Energy Meter Kit

Comes with Energy Meter, 2x 16 mm round YHDC SCT-016 120 A CT Sensors, Pre-programmed ESP32 Dev Module, 100x60x25 mm ABS plastic box, PCB ESP32 box adapter, and mounting screws. Everything you need to connect the energy monitor to your house and start monitoring your energy usage in no time. European customers must provide their own 9 V AC Transformers.


Solar Monitoring + Energy Meter

If you want to monitor your solar power generation and energy usage at the same time, this is the package for you! Comes with 2x Energy Meters, 4x 16 mm round YHDC SCT-016 120 A CT Sensors, PCB ESP32 adapter, Pre-programmed ESP32 Dev Module. European customers must provide their own 9 V AC Transformers.



CircuitSetup's goal is to make affordable and useful electronic components available to makers, and DIY electronics enthusiasts. Our products are carefully crafted, tested, and re-tested to make sure they meet the demands of their users.

John Deglavina

Founder & Product Designer

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