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We had a version of the HDDJ working with an arduino reading an old stepper motor (with 4 wires), then sending serial data to processing, using a midi library, and midiox + midiyoke. Having trouble getting reliable forward/back speed data from the newer HDD's (2 or 3 wires), I think they are brushless DC motors? anyone had any experiance with this?

Cheers, Al

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Check out http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1251656637/7#7 It has the arduino version of the instructable, a video, and a diagram of how to set it up.

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Wow this is excellent! Nice write up, code, and breadboard layout in fritzing. – jkopel Nov 3 '09 at 20:08
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I have used a brushless motor from a CD player for input. The best info I found was this instructable http://www.instructables.com/id/HDDJ_Turning_an_old_hard_disk_drive_into_a_rotary/

They show how to use an op-amp to make the signals readable.

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Yeah, had old steppers going with the op-amp, but brushless seemed to give unreliable glitches compared to the stepper. – Allan Oct 30 '09 at 20:54
You need to make sure you are connecting directly to the leads of the motor and have cut any and all the other circuitry out of the way. The motor I used had a number of hall effect sensors and such mounted internally. I opened it up and just unsoldered them before attaching the motor to the op-amp circuit. – jkopel Oct 30 '09 at 21:18

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