EmonTx v2





A low power, wireless energy monitoring node, the EmonTx is designed to sense data from multiple CT sensors, optical pulses from a utility meter and from multiple one-wire temperature sensors. It can be powered by 2 AA batteries or 5V at the USB connector.  Features and hardware details.

The emonTx is based on the Atmega328 8-bit microcontroller and is fully compatible with the Arduino IDE. A 5V FTDI to USB cable is required for programming.

The design is based on the JeeNode. It's fully open-source and is designed for easy expandability and compatibility with JeeLabs plug-shields.

Thank you to Robert Wall for the port map diagram.


See the dedicated features page

Build Guides

Open Hardware

The emonTx is open hardware with the designs released under the Creative Commons Attribution-ShareAlike 3.0 Unported License. The schematics and board files can be viewed and downloaded from the openenergymonitor github hardware repository here:

Firmware Examples

Start by setting up the Arduino programming environment so you're ready to upload code once you're finished building the board: Setup the Arduino Programming environment

All emonTx V2 Arduino Firmware is available on github. See the readme for a list of available firmware: