ATM90E26 Single-Phase Energy Monitor Dev Kits

by whatnick

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

Mar 08, 2018

Getting started with the default firmware on the DIN Rail Energy Monitor

This is just a starting point of what is possible firmware wise on this platform. Read the full update.

Feb 13, 2018

Shipping of DIN Rail Monitors

DIN Rail electronics passed tests Read the full update.

Jan 18, 2018

Address Update

Shipping of the Breakout board, Featherwing Board and kits will be beginning soon. Please update your address if you need to. Read the full update.

Jan 05, 2018

Manufacturing and Shipping Update

TM90E26 Breakouts and Featherwings will be shipped to Crowd Supply next week, DIN Rail energy monitor's are expected to ship early February. Read the full update.

Dec 01, 2017

Production Update

I have been making good progress and continuously releasing my work on Github for review. Read the full update.

Oct 17, 2017

ATM90E26 Featherwing Test Rig and QC

This week I am building an automated test rig for the ATM90E26 Breakout boards Read the full update.

Sep 18, 2017

Many Thanks for all of your Support

The campaign concluded last week with around 200% of my initial target raised. Thank you so much for your support. Read the full update.

Sep 13, 2017

Campaign Ending Soon

This is your friendly reminder that the ATM90E26 Single-Phase Energy Monitor Dev Kits campaign will be ending soon. Read the full update.

Sep 07, 2017

ATM90E26 Breakout assembly and QC progress

Thank you very much for your interest and support. I have reached my funding goal with a few weeks to spare. Read the full update.

Aug 14, 2017

Progress on DIN rail power/sampling board

I have been receiving a few questions regarding the 3-phase supplies and the DIN rail module. Read the full update.

Aug 04, 2017

ATM90E26 Featherwing Assembly Progress

Here are some assembled board photos. Read the full update.

Aug 01, 2017

The ATM90E26 Single-Phase Energy Monitor Dev Kit is Now Live

The ATM90E26 Single-Phase Energy Monitor Dev Kit campaign is now live. The energy monitor dev kit is an open, affordable and accurate energy monitor using ATM90E26. Read the full update.

$4,900 raised

of $1,800 goal

272% 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.


DIN Rail Energy Monitor (Single ATM90E26)

Something your electrician will feel good about installing. A fully featured DIN rail module with options to install two ATM90E26 monitoring boards for grid + solar. Can be interfaced with Wemos (ESP8266) footprint boards to add Wi-Fi, BLE, LoRa, and other forms of network connectivity.


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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