Arduino Compatible MC-2100 Controller and Lathe Tachometer 

The completed circuit in operation

After getting the simple 555 based MC-2100 driver circuit working, we moved on to a controller with more features. I’d been looking for an excuse to make an arduino-compatible board (here’s a description if you’re not familiar), and this seemed like the ticket.

The initial spec for the controller included the following functions:

  • Read user input from potentiometer
  • Send the 50ms period PWM signal to the MC-2100
  • Sense the lathe’s spindle speed using a magnetic reed switch or equivalent
  • Display the spindle speed on a 7 segment LED display

At this point, the controller meets the requirements laid out above. I’ll discuss the implementation of each feature into the controller in the order listed above.

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