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.