Chris over at [DIY is the way] built an Arduino powered thermostat they you can monitor your heating and cooling system via a web interface. The project allows him to monitor and control the thermostat remotely. The project uses an Arduino (Duemilanove), an Arduino Ethernet Shield and an LM35 temperature sensor.

The Arduino is a low cost open source microcontroller which has gained a huge following by DIYer and artists.

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