Short input code which processes the wii balance board input and calculates a bad estimate of weight with the simplest possible kalman filter.
Currently just an upload of old hacky code done over the weekend on a congress.
Calibration was done at one weight point with another scale, so it really isn't calibrated.
Compile with gcc -o wiiweight wiiweight.c.
To use this the wii balance board has to be connected and you need the assigned number by ev.
Use evtest to check which number $X is assigned to the balance board and pass it with ./wiiweight /dev/input/event$X.
The program will show the current measurement and the pseudo kalman filtered measurement in cout.