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A very simple and easy to use 12 Bit I2C ADC Breakout with on board voltage reference
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I2C Mini pH probe interface project page
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A page detailing the information about LeoPhi our Arduino Compatible USB enabled pH interface.
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A very flexible and completely open source solution to garden automation. From Autoponics to standard outdoor monitoring.
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Simple USB to Serial convertor that fits Xbee modules and has the standard Sparkfun Header for programing AVR's, Arduinos, etc...
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Xbee voltage level converter. This is a useful project for those times when you need to interface 3.3v with a 5V Arduino.
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A diy tutorial for arduino platform, shows how to make a pH probe sensor interface for arduino
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A simple tutorial showing how to create a small, cheap, relaible relay board to allow an Arduino to switch high voltage and current.
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CT coil interface that allows near instant gain switching, follows the Atmel AVR465 application note for Energy monitoring.