I have an AC PWM dimmer board from eBay that uses a potentiometer to control the dimming level. I want to replace it with a digital potentiometer that would serve the same function. However, it needs to be able to handle at least 120VAC and 0.5mA. It also has to be able to be controlled by 5VDC from an Arduino, Raspberry Pi, etc. Does anyone know of any such part?
120VAC Digital Potentiometer
acdigital potentiometermicrocontroller
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Best Answer
There are at least a couple of different options but neither is going to be very good.
1) Use a LED / CdS cell combination. The amount of LED current will change the CdS cell resistance - typically from a few hundred Ohms all the way up to several Megohms.
The downsides are: a) Poor Linearity; b) downright awful device-to-device matching.
2) Convert the dimmer design to a standard phase-control circuit using an appropriate opto-coupler (MOC3011). The downside is that you need to sample the incoming AC zero-cross points and have your controller delay the signal into the opto by the correct amount for the particular dimming level desired.
Or: you could simply build or purchase a dimmer designed for remote control. There are many existing designs available, ranging from analog control (0-10 Vdc) or a digital bit-stream or digital PWM control.