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Like Wii Fit, but you don't need to leave your bed.
Status: Research phase.
One bed, four force resistor sensor, one under each leg. Measure the weight of the person(s) sleeping in the bed and presenting daily weight measurements and weight-changes during sleep (Determing nightmares? Other perodic bed activities?) on the internet using a genericethernet-module, or indirect via a genericcan-module.
Using FSR-sensors bought from http://androidworld.com/prod59.htm.
Latest schematic/PCB-layout can be found in repository
/hardware/trunk/schematics/Sleepalizer/ in SVN.