The title says it all. I'm doing a project with a spinning HDD disk with a slot cut in it, RGB LEDs, and precise turning on and off of the colors.
I'm planning to glue a magnet and use a hall effect sensor, but just opened another HDD and this one has 4 pins instead of 3. I applied voltage to all 4 pins (5V)so I hope I didn't fry the sensor, but I've identified 3 that have 8 ohms, 1 has 4 ohms. So I want to know, can I forget using a magnet and use the sensor already in the motor?
If so how would I wire it to receive pulses on each rotation, or magnetic pole switch?
Any insight on this is greatly appreciated as I've googled and cannot find one example of how to wire it.