Arduino Hard Drive Rotary Encoder Use a hard drive motor as a rotary encoder. One of the motor connectors is common and tied to ground. Use the one that measures least resistors to the others. Then ...

The motor controller is commanded over the Arduino’s serial interface, and will support a serial interface to ROS (Robot Operating System) in the future.

The one catch is that you have to have a hard drive that uses a very particular motor scheme for this to work. The platter rotation shows the hour and the head’s track position counts off the ...