Isolated Grid ZCD Sensing applicable to any Microcontroller

zero crossing detection with any microcontroller, optical isolation provided by optocoupler

Hello friends there are many ways of sensing grid ZCD here is one which can be used with mostly all microcontrollers. This is optically isolated method for ZCD Sensing. (Here is a non isolated method of ZCD sensing)
You can reduce power draw from the isolated circuit by decreasing the optocoupler’s LED current with a corresponding increase of the optocoupler’s load resistor yields slower and more uncertain switching. To achieve faster and sharper switching, you would have to sacrifice power efficiency; however, the benefit of this sacrifice is limited because of the inverse relationship between power efficiency and the ac-voltage magnitude.
You can see many other techniques of optical isolation at this link.

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