The PIC16F84 that is used is a very basic& cheap FLASH µController from MICROCHIP.
It has 13 digital I/O’s of which just 5 are used here. The PIC16F84 has no analog inputs or outputs.The controller is ideal for experimenting because it can be erased and re-programmed 1000 times.For easy time calculation the circuit used a 10.24 MHz Xtal.
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