We used the buffer 74LS245 for our project. It is an electronic chip that has 20 pins. Pin 20 is the +5V power pin, and pin 10 is the ground pin.This 74LS245 buffer chip has 8 inputs pins and 8 output pins. Pin number 1 is considered the direction pin; therefore, it’s labelled DIR. It is called the direction pin because it controls the direction of the flow of electrical current. When DIR is held high, or 1, the input would be taken from the “A” side and the output would be given from the “B” side. In the same manner, when DIR is held low, or 0, the input is taken from the “B” side and the output would be given from the “A” side. When pin #19 is +5V, no information moves from A to B or B to A. When pin 19 is 0V, information flows from A to B or B to A depending on the wiring of pin 1. Pins 2-9 (A1-A8) and pins 18-11 (B1- B8) are the data pins.
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