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.

(Read the rest of this post…)

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