emonTx stands for Energy Monitoring Transmitter. It’s a small, open source wireless energy monitoring node. It’s based on the Arduino (Atmega328) and is fully compatible with the Arduino IDE and programmed via an FTDI to USB cable.
It’s designed to take inputs from multiple CT sensors, optically from a pulse-output utility meter and from multiple one-wire temperature sensors, and interface via RF with the Nanode which then makes the data available over the Internet. The emonTx is designed to be powered by 2x AA batteries or 5V USB. [via]
Openenergymonitor – [Link]