Zero crossing with only resistor but without traditional components

lara's picture

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Joined: Oct 05, 2018

Replies: 4
Zero crossing with only resistor but without traditional components
December 20, 2018 - 2:38am

Hi,
Would you suggest  what should i cosider in the aspect of design before to connect live wire of 230v/50hz directly to a MCU Pin through a resistor/s only  for the purpose of detection of zero crossing point in which traditional ckt(combination of diode, resistor, opto) can be truncated with minimul component in design.
To achieve the above scenario what step should I follow in step-wise for getting a good x-ing point as well??

I have google that it is possible in direct with mcu also seen some microchip AN.
Thnk all.  

Ashutosh's picture

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Joined: Aug 27, 2018

Replies: 7
with MCU it is possible
December 20, 2018 - 11:04am

Yes it is possible to detect zero crossing with just a single resistor and a microcontroller.

This topic has already been discussed here 

https://circuitdigest.com/forums/embedded/solved-ac-load-control-triac-d...