Hello everybody, I have been working with a friend on a project for a while, its about the construction of an evaporative cooler, we already made it but we are still missing the automatic part; we need to control the velocity of the fan motor using arduino by interpretating the signal of a temperature and humidity sensor, we tried a simple circuit that uses a potenciometer to regulate and it worked pretty well, its a circuit like this one:
The problem is now to add the part of the arduino to make it work as a potenciometer. I was wondering if I can change the potenciometer for a digital one like the AD5241 or AD5242 and make it work up to 1 MOhm? Do you think it can actually work as a normal potenciometer but interpretate the signal of arduino?
We already looked for other circuits, some of those use an optocoupler, but the problem is that motor is AC and inductive so it won´t work.
The motor we need to control is an AC fan of 1/8 hp 110 V 3.6 A.
Thanks for everything