How would you something like this “ AC cycle control ” to a micro controller

[sam_sam_sam]

How would you hook up a micro controller to zero crossing to be used as a AC cycle controller

This right now is for a proof of concept and weather or not it can be done for educational purposes for now

Using this type of optic sensor “ H11AA1 ”

Here is the discussion on this forum

https://forums.parallax.com/discussi...with-p1#latest

[stj]

Re: How would you something like this “ AC cycle control ” to a micro controller

microchip has a pdf all about doing zero-crossing with an mcu
https://www.microchip.com/design-cen...o-cross-detect

[eccerr0r]

Re: How would you something like this “ AC cycle control ” to a micro controller

If you're using a ZC optoisolator, you don't need to do anything, just turn it on and isolator does ZC for you. Just that the microcontroller won't know exactly when the device is on, it could be many milliseconds before the device turns on.

Or as stj says you can do this in software and you have to tell the microcontroller when the ZCs occur. This way the microcontroller knows when the device is on because it knows when the ZC occurred.

Yes knowing the whole system would be helpful. Costs an extra pin on the microcontroller to detect ZCs but sometimes like controlling a heater, it doesn't matter and you can save a pin. Motors likely also fall into this category unless you want to know the exact positioning of the motor, then perhaps it matters.

[stj]

Re: How would you something like this “ AC cycle control ” to a micro controller

knowing the use would help.

the biggest reason for an mcu to know 0-point i think would be a video-wall - to prevent tearing of the image