you need 3 saparate ZCD – | Microcontroller › PIC › PIC 16F676 C CODE for analog i/p signal detect › you need 3 saparate ZCD – October 19, 2017 at 1:23 pm #14674 Ashutosh BhattParticipant you need 3 saparate ZCD – zero cross detector circuits one for each phase the output of ZCD is continuous pulses till AC is present as soon as AC gone – the pulses will disappear so continuously monitor pulses from 3 sides and when any one or more is absent turn on the LED thats all
