Using Hard Drive Motor to Make Pretty LEDs Blink (aka rotory encoder with an op amp)





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Published on May 17, 2011

**Attention! I have a new blog!**

Here i've made a neat little thingamabob that turns an old hard drive's motor into a rotory encoder which who's spinning motion translates into pretty blinking lights. By reading the motors 3 phases as the magnetic ring inside passes by them inside the motor we can accurately tell which direction it is moving. this isn't a particularly new idea but i think this is one that anyone can do considering that the cost is about $5 for the whole thing and much less if you can scrounge some of the parts such as in my case. In any case here's the parts list

-1x "lf347 quad op amp ic" ($1.50)
-3x 10k resistor ($0.05 ea)
-3x 1k resistor ($0.05 ea)
-3x 100 ohm resistor ($0.05 ea)
-3x 5mm ($0.15 ea)
-1x protoboard at least 2inches by 2inches ($1-4)
-1 meter of wire (freeish)
-1x hard drive motor (free from old hard drive)

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