Electricity monitoring library - install in Arduino IDE's libraries folder then restart the IDE
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Arduino Energy Monitoring Library - compatible with Arduino 1.0
Designed for use with emonTx: http://openenergymonitor.org/emon/Modules
Download to Arduino IDE 'libraries' folder. Restart of IDE required.
Git Clone and Git Pull can be easily used to keep the library up-to-date and manage changes. JeeLabs has done a good post on the topic: http://jeelabs.org/2011/12/29/out-with-the-old-in-with-the-new/
Update: 5th January 2014: Support Added for Arduino Due (ARM Cortex-M3, 12-bit ADC) by icboredman.
To enable this feature on Arduino Due, add the following statement to setup() function in main sketch: analogReadResolution(ADCBITS); This will set ADCBITS to 12 (Arduino Due), EmonLib will otherwise default to 10 analogReadResolution(ADC_BITS);. See blog post on using Arduino Due as energy monitor: http://boredomprojects.net/index.php/projects/home-energy-monitor