Room Management System - Input stage part 2

Now we find all the parallel input pins (pin 1, 4 to 7 and 13 to 15) of our shift registers and connect a 10 K resistor to ground on each of the input pins.

Time to connect the switches to our shift registers. Starting with number 1:

Pin 7 (parallel input 1) goes to S1;

Pin 6 (parallel input 2) goes to S2;

Pin 5 (parallel input 3) goes to S3;

Pin 4 (parallel input 4) goes to S4;

Pin 1 (parallel input 8) goes to S5;

Pin 15 (parallel input 7) goes to S6;

Pin 14 (parallel input 6) goes to S7;

Pin 13 (parallel input 5) goes to S8;

We carry on to shift register 2:

Pin 7 (parallel input 1) goes to S9;

Pin 6 (parallel input 2) goes to S10;

Pin 5 (parallel input 3) goes to S11;

Pin 4 (parallel input 4) goes to S12;

Pin 1 (parallel input 8) goes to S13;

Pin 15 (parallel input 7) goes to S14;

Pin 14 (parallel input 6) goes to S15;

Pin 13 (parallel input 5) goes to S16;

Finally the shift register 3:

Pin 7 (parallel input 1) goes to S17;

Pin 6 (parallel input 2) goes to S18;

The rest of the input pins of shift register 3 staying empty for now. Don't worry, we will use a couple of more inputs at a later stage.

In the next part we start writing the code for the input stage.