Hi Miles,

I used your wii motion+ code and tested the chip on my turnable at 33.3333 rpm and found that the yaw gyro appears to work alright, giving 21 counts*sec/°.

When putting the chip side up to test the roll gyro, the chip puts out real strange data. Did you test that?

I get the following output:

WM+ tester

   yaw: 8318   pitch: 7984   roll: 8187         //calibration zeroes
   yaw: 22     pitch: 14     roll: 24           // still
   yaw: -2     pitch: 12     roll: 17
   yaw: -9     pitch: 12     roll: 30
   yaw: -22    pitch: 25     roll: 24
   yaw: -9     pitch: 19     roll: 24
   yaw: 18     pitch: 6      roll: 30
   yaw: -16    pitch: 12     roll: 36
   yaw: 5      pitch: 12     roll: 11
   yaw: 45     pitch: 93     roll: 3812         // turning (side up) at 33.333 rpm
   yaw: 324    pitch: 328    roll: 4140         // clockwise for roll axis test
   yaw: 555    pitch: 563    roll: 4426
   yaw: 378    pitch: 384    roll: 4227
   yaw: 575    pitch: 588    roll: 4475
   yaw: 793    pitch: 762    roll: 4692
   yaw: 956    pitch: 917    roll: 4903
   yaw: 1133   pitch: 1047   roll: 1028
   yaw: 1350   pitch: 1245   roll: 1233
   yaw: 1575   pitch: 1456   roll: 1431
   yaw: 1752   pitch: 1617   roll: 1042
   yaw: 1395   pitch: 2033   roll: 1365
   yaw: 1674   pitch: 1426   roll: 1346
   yaw: 246    pitch: 1271   roll: 645
   yaw: 1626   pitch: 1450   roll: 1427
   yaw: 1674   pitch: 1500   roll: 1464
   yaw: 1688   pitch: 18     roll: 99
   yaw: 1042   pitch: -230   roll: 409
   yaw: -10    pitch: -2     roll: 14           // still
   yaw: -17    pitch: -2     roll: 20
   yaw: -3     pitch: -8     roll: 1
   yaw: -10    pitch: 4      roll: 14
   yaw: -10    pitch: 4      roll: 1

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it looks as if data add up in the yaw and pitch memory of the on board IC and when they reach 1000 counts the whole thing goes mad. the data they show are useless on all channels.

Do you have an idea what is happening here?

please let me know what I CAN DO TO SOLVE THIS MYSTERY,

thanks, newbee