ATM90E26 Single-Phase Energy Monitor Dev Kits

by whatnick

An open, affordable, and accurate energy monitor using ATM90E26.

View all updates Jan 18, 2018

Address Update

Hi All,

We’ve received a package from Tisham Dhar of Whatnick. We will soon begin shipping out the following pledge levels:

  • ATM90E26 Breakout Board
  • ATM90E26 Breakout Kit
  • Energy Monitor FeatherWing
  • Energy Monitor FeatherWing Kit

If needed, please update your address by visiting your account page.

As soon as your order ships, you will receive a confirmation email with tracking number. You can learn more about shipping by visiting our guide.

The DIN Rail units are still in production. Tisham estimates mid-to-late February for delivery on those. Thanks for your patience in the meantime.


Eric Strom
Crowd Supply

$5,145 raised

of $1,800 goal

285% Funded! Order Below

Product Choices


Energy Monitor FeatherWing

A hacker-friendly, low-voltage dev kit for the ATM90E26. Compatible with most Adafruit Feather-series boards and accessible via SPI or UART. Two can be stacked in SPI mode for grid + solar single-phase monitoring.


Energy Monitor FeatherWing Kit

An Energy Monitor Featherwing with some essentials to get you going. The Adafruit Feather and a 100 A YHDC current clamp will be included as part of the kit. Voltage sampling transformer is the only other part the user has to supply.


ATM90E26 Secondary Module for DIN Rail Use

Secondary module for the DIN Rail Energy Monitor above which will add another phase into the monitoring setup. Essentially the same as the breadboard version but with isolated SPI bus making it suitable for use with high-voltage inputs. This module can be used to measure a second phase or single phase solar output after the inverter. You can also use it to design your own isolated high-voltage monitoring system.



Whatnick INC is a consulting engineering company mainly working in the Energy Monitoring arena. We aim to build open-source hardware and empower users to put their own monitoring solutions together.

Tishampati Dhar

Electronics Design Lead

Rany Thach

Logistics and Supply Chain

Gokul Shriyam


Andrew Karas

Enclosure Designs and MCAD

Fabrice Marre

Video Production




PCB Manufacturer

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