@▷ LED 7 segment Count Down Alarm | Diagram for Schematic

LED 7 segment Count Down Alarm

LED 7 segment Count Down Alarm



 

LED 7 segment Count Down Alarm

 


Here I have added two fets for the time-out switch, it is like an electronic relay, just much more reliable it can be used to sound a big horn, or what ever you like. PIC 16F84 running 4.00 MHz using crystal or resonator, not critical since this count down alarm only runs for a few minutes


LED 7 segment Count Down Alarm



LED 7 segment Count Down Alarm



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