Energy Display

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I am looking for a (functionally) very simple device. All it should do is display the amount of energy (kWh) used in my house (refresh reading every 0.1 - 1 second). Does anyone know whether this device already exists and if not whether it is difficult to design/produce.

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There is a family of chips, i think from samos (south african chip producer) or ams (austrian microsystems). These chips have all the analog stuff build into them, they primarily need one or three hall-effect sensors, which sense the current flowing on the wire.

They have also an application note with all the required timing resistors / capaciors, right crystal and all...

One of these chips gives you the output in pulses, each good for 6,2 Ws...

you can then go and integrate these pulses over time, do average calculations etc...

You can try the following link:

abc.comnet.at/mrtg/pwr.html

(This is the energy my flat actually uses). The MC used there as back-end however is a 6805 and not an AVR...