I want to use an Arduino to control a motor I pulled from a treadmill. The treadmill came with an MC-60 controller. The treadmill used a potentiometer to control the motor speed. Here's a portion of a treadmill schematic I found that shows the potentiometer and the MC-60 controller:
Many sources cite the potentiometer for the MC-60 board as being 5K Ohms, but I measured 10K Ohms on my treadmill's potentiometer. Looking at the schematic, it looks like the MC-60's potentiometer uses 12V. The Arduino pins supply 5V.
What's the appropriate circuit from the Arduino to the H, W and L pins on the MC-60? I want to use the Arduino to control the speed (through a digital potentiometer, I'm assuming).
Note: Consider me a novice on electrical engineering. I use the cut and paste method of circuit creation. :-) I'm a professional software engineer so I can handle the programming end pretty well.