Splat1.com Now what happends if I press....

Picked up one of the N67FU Electricity Cost and Usage Calculators at Maplin for £9.99. After seeing the Tweet-A-Watt on hackaday I decided to see what I could do with it.

http://www.maplin.co.uk/module.aspx?moduleno=223573

Photo's at http://www.flickr.com/photos/splat1/
Information printed on the unit,
Plug-in Electricity Cost and Usage Calculator
Model: N67FU
Rating Voltage:
AC100-240/50-60Hz
Power measurement:
0.2-3120W
Voltage measurement:
AC 90-250V
Current measurement:
AC 0-13.00A
Frequency measurement:
50-60Hz
Electric quantity measurement:
0.001-9999kWh

BS1363
Usual Lead free and CE stickers.

Key Parts:
Elan - EM78P468NQJ 8-Bit Micro controller
Microchip Technology Inc - 24C01A is a 1K bit Electrically Erasable PROM
Cirrus Logic - CS5460A-BS - Single Phase Bi-Directional Power/Energy IC

Jobs to tackle,
Reconstruct a circuit digram for the unit.
Find a way to power the unit without mains connection so we can have a poke at its operation without the risk of frying oneself.
Have a good read of the data sheets of the 3 main parts and see where we can improve/brake things.
Check to see if its possible to dump the existing code from the MCU and EEPROM.
See what the pin headers and contact spots are for on the board.

To be continued...