Home energy monitor
I've had a go at a home energy monitor based on the mbed, measuring whole house electricity and gas. This is done in a non-invasive way with a current and voltage transformer for the electrical power and an IR photoreflector for the gas.
This picture shows the LCD displaying electrical power (one of the pushbuttons is used to toggle to gas unit display at the moment):
Current transformer (voltage transformer is not shown; it is an AC-AC plug-in adapter):
Photoreflector (the zero digit on the rightmost dial is conveniently reflective):
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