This energy monitoring transmitter, known as emonTx, is an Atmega328-based small wireless energy monitoring node. It also fully compatible with Arduino IDE. EmonTx is designed to take inputs from multiple CT sensors, optically from a pulse-output utility meter and from multiple one-wire temperature sensors. The design is based on the JeeNodeV5 by Jean-Claude Wippler and uses 2x AA batteries or 5V USB as power source.
The device can be used to monitor electricity consumption, water and gas monitoring (from pulse output meter), renewable generation monitoring, heatpump monitoring, temperature monitoring and large scale monitoring.
Project Firmware, Schematic and Documentation