For this project, we use 16f877A PIC microcontroller. It has 40 pins consists of 5 ports which are Port A, Port B, Port C, Port D and Port E. We only use Port A and Port B. We use Port B for the output while Port A is used for input from the input buttons active low that activates the circuit. The chip has two pairs of power pins (VDD__5 V nominal and Vss _ 0 V), and either pair can be used.
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