I managed to control an old 3.5" floppy drive with my Arduino Uno. At the moment of this video, I am able to control the main rotation stepper, the power light and the reader head stepper. I control the drive through an IDE cable and I use the following pins: Pin 10: Main stepper - High = stop, Low = start. Pin 14: Power LED - High = off, Low = on. Pin 18: Move reader head one step - High = one step, Low = do nothing. Note: pin 18 must oscillate between high and low to make the reader step. Pin 20: Reader head step direction. High = Step towards the back of the drive, Low = Step towards the front of the drive.
Tags: Floppy, drive, 3.5, Arduino, uno, homebrew, hack, IDE, PATA, ATA
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