So I'm controlling a fairly heavy motor for a school project and I've got the motor control to work at this point. We're using this controller for speed control. The thing is, it has to be remotecontrolled, we're doing this through an arduino. I can't seem to figure out how to replace the potentiometer with arduino control. I've figured out which cable is V+(red), Vout(yellow) and ground(black), that was fairly obvious. I know that I somehow have to use PWM and a 100K resistor because of the impedance. The on/off switch is also in the pot-meter, but I've figured out how to replace that. On the poFrom googling I've seen that a digital potentiometer might be an option, but I don't really have the time to order that in time, because we're approaching the deadline for the project.
How do I hook up the arduino to the pins on the motorcontroller that would've normally be hooked up to the potentiometer to do the speed control remotely.
Any help would be greatly apprectiated! :) I'm fairly new to electronics so I'm sorry if these are noob questions.