its very simplein main | Projects › Projects › LASER SECURITY USING LM339 › its very simplein main March 31, 2014 at 4:53 am #11427 Ashutosh BhattParticipant its very simple in main function switch off buzzer initially. in ur ISR just switch it ON. dont switch off. when reset is pressed manually again main function is called so buzzer will be off.
