EmonTx Arduino Shield

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emonTx Arduino Shield

An open-hardware wireless energy monitoring Arduino compatible (Duemilanove,Uno and Leonardo) shield.

emonTx Shield BackemonTx Shield Front

See non-invasive section of building blocks for theory behind CT energy monitoring.


  • Apparent Power, Real Power*, Power Factor* and AC RMS voltage readings*
  • 4 x CT Current Sensor input
  • AC 9V RMS voltage sensor input
  • 433/868Mhz RFM12B (HopeRF) wireless transceiver to transmit/receive data to other OpenEnergyMonitor and JeeNode modules
  • On-board DS18B20 digital temperature sensor
  • Status LED
  • Compatible with Duemilanove,Uno and Leonardo
  • Compatible with OpenEnergyMonitor modules (emonGLCD, emonBase - NannodeRF etc.)

* with 9V AC adapter

Design Files & Part List

  • 10 x 470K (yellow, violet, yellow, gold)
  • 5 x 10uF
  • 4 x 33R 1% (orange, orange, black, brown)
  • 4 x 10K 1% (brown, black, black, orange, brown)
  • 4 x 4K7 (yellow, violet, red, yellow, gold)
  • 4 x 3.5mm jack (Rapid: 20-0157)
  • 1 x 0.1uF (100nF)
  • 1 x 470R (yellow, violet, brown, gold)
  • 1 x 100K 1% (brown, black, black yellow, brown)
  • 1 x 2.1mm DC barrel
  • 1 x RFM12B 868/433Mhz (HopeRf)
  • 1 x 82mm/165mm Ant
  • 1 x 3mm LED
  • 1 x DS18B20 temperature sensor (optional - not included as standard)
  • 1 x 6 pin ISP header (female)
  • 2 x 6 pin header (or 1 x 28 pin header)
  • 2 x 8 pin header

Recommended CT: 100A max SCT013-000 See building blocks for more information on CT's

Build Guide

Port Map

Function Arduino Port
9V AC sample ADC0
CT 1-4 ADC 1-4
DS18B20 Temperature Dig4
LED Dig9
RFM12B SS Dig10 (recommended) / Dig5
RFM12B INT Dig3 Leonardo / Dig2 Uno

Code Guide

Example Sketches