Last Updated or created 2025-02-13

Part of a client’s build for powerful DC motors, so no details

Controlling this with an Arduino is straightforward, except for the SV signal.

This controls the speed using a voltage level.
A Uno has analog inputs, no outputs.

The trick is using a digital potmeter.

256 steps potmeter MCP41100

#include <SPI.h>
int svpin = 5;
setup:
  pinMode(svpin, OUTPUT);

loop:
// SPI Digital potmeter
  digitalPotWrite(0x20);