Page last updated at 05:38 GMT, Friday, 29 May 2009 06:38 UK

Tech Know: When is the pot empty?

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A system to monitor the level of tea in a pot is one of many gadgets spawned by a mini-computer.

Ellie Gibson meets the enthusiasts using the Arduino micro-computer in their home-brewed inventions.

The Arduino can be linked up to any number of sensors and links the information it gets from them to an action.

It is open-sourced, allowing anyone to make use of it.

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