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Topic: Clickwheel with Arduino (Read 7 times) previous topic - next topic


Thanks. :-)

If you could add a photograph of your motor connections that would be helpful too. :-D



That's the next thing to do, yes!  Of course, all CD-ROM motors are not the same, so it'll take a bit of figuring out which wire goes where on your particular motor.  Also, some motors might have the Hall sensors in parallel, instead of in series as I've shown them.  The motor driver chip datasheet shows that either configuration will work.


Through much pain and digging I came across this topic. I am not very much into electronics, so I cannot find the words that make google happy.
I have that same type of brushless CD motor, with obviously hall effect sensors in it (from the look of it probably 3). But it has a ribbon cable with 12 pins, so I cannot decode that :).
Obviously I am also waiting for your pictures and additional explanations. I also read your post about how to power and control such motor, but again - instead of 3 I have 12 pins, that I cannot decrypt.
Thanks for all the shared info so far!


Some of the wires in that 12-conductor cable may be unused, and some may be connected in parallel.  The first step is to use a multimeter to check for continuity between ribbon cable wires and the pins of the Hall-effect sensors.  Try to figure out the wiring of the motor coils, too, so that you can levae them unconnected.  Note from my diagram that the three Hall-effect sensors will have two wires each, plus power and ground.


Apr 06, 2009, 08:35 pm Last Edit: Apr 06, 2009, 08:38 pm by mircho Reason: 1
Thank you for your reply!
I went further with my observations, and traced which wires are connected to which hall-effect sensor. I traced the 6 wires to the 3 sensors.
Now what I don't know is if there is polarity in those sensors?
I assume that I have to count this way - 6 output lines from the sensors, power, ground for them, 3 control lines for the coils. (I traced those also). Is that right?
My motor comes from disassembled CD ROM. In it you can find two more motors the one opening the tray, and the one moving the optical head.
I managed to work with the DC motor that positions the head laser reader. On both drives I found a motor with linear optical encoder attached directly to the shaft. Because the encoder is linear (3 wires) and optical (led) I figured out the power and the ground (from the placement of a resistor) and was able to read the ticks from the data pin. (Sorry for the little off topic but I think googlers might find it handy)

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