How to synchronize PWM with external event

[codezork]

As for dimmer applications neccessary, a pwm signal with variable duty-cycle must be generated to drive a triac. But to be synchronized with the mains' zero crossing, the pwm cycle must be started by a GPIO event from a zero-crossing sensor (optocoupler). What would be the best approach to solve this problem? Has anybody done a similar thing before?

[RUTU]

Hi ,

I also want to do dimming with BLE Event and I am able to do dimming with your reference code. In our requirement we want two dimming . When I try to do two dimming using your example code and using another code capture register It works . But when i changed the intensity of one Dimming module the another gets automatically infected and change the intensity . Can you please give some info if I want to do two dimming using single Zero Crossing Event then how can i do??

[codezork]

If you could share your code, it would be easier to find the problem. BTW I left TRIACs and using the leading edge and changed to MOSFETs using the trailing edge. This leads to a much less noisier switching with nearly no EMI. Disadvantage: you need 2 MOSFETs for switching.

[umeshdj]

Is there any way to implement it using nRFx in nRF connect SDK? I want to implement a fan regulator / light dimmer using nRF52832. I know this is an old post.