ATMEL 8535L

hi all,

I am using ATMEL 8535L microcontroller.I am controlling the heater using PWM.The PWM is in Interrupt service routine.I want to check whether the Triac is shorted.For this i am stopping the PWM and giving a delay of 100 ms and checking the feedback .if i get a pulse.I am displacing triac has failed.

I am stopping the PWM for every 80 seconds and checking.This checking is done in while one loop.whenever the routine is executed there is a flicker in the LED display(for every 80 seconds).

Kindly guide me in solving this.


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