Circuit Lake

Electronic Project and Circuit Collection

PIC Countdown Timer

05/09/2009 Category: Monitoring, PIC, Timer


The goal of this PIC timer is to provide a countdown time from 1 second to 99 minutes & 59 seconds. One of its applications is to control the lighting for the Ultra-Violet exposure of photosensitive PCB material. The project provides also an audible alarm at the end of the countdown time and switches the UV lights by means of a relay. The timer uses microcontroller PIC16F84(A) to store up to 15 different (user-programmable) countdown times.

PIC timer
Countdown timer documentation