CODE | Shift Register 8-Bit Binary Counter - Arduino Project 017
In this project, you’re going to use additional ICs (Integrated Circuits) in the form of shift registers in order to drive LEDs to count in binary (I will explain what binary is soon). Specifically, you will drive eight LEDs independently using just three output pins from the Arduino.
Project 17 Shift Register 8-Bit Binary Counter
/* Coding Ron Wang
Sep.10th 2024
Autaba support for coding hardware
Project 17 Shift Register 8-Bit Binary Counter
*/
int latchPin = 8; //Pin connected to Pin 12 of 74HC595 (Latch)
int clockPin = 12; //Pin connected to Pin 11 of 74HC595 (Clock)
int dataPin = 11; //Pin connected to Pin 14 of 74HC595 (Data)
void setup() {
//set pins to output
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
}
void loop() {
//count from 0 to 255
for (int i = 0; i < 256; i++) {
//set latchPin low to allow data flow
digitalWrite(latchPin, LOW);
shiftOut(i);
//set latchPin to high to lock and send data
digitalWrite(latchPin, HIGH);
delay(1000);
}
}
void shiftOut(byte dataOut) {
// Shift out 8 bits LSB first, on rising edge of clock
boolean pinState;
digitalWrite(dataPin, LOW); //clear shift register ready for sending data
digitalWrite(clockPin, LOW);
for (int i=0; i<=7; i++) { // for each bit in dataOut send out a bit
digitalWrite(clockPin, LOW); //set clockPin to LOW prior to sending bit
// if the value of DataOut and (logical AND) a bitmask
// are true, set pinState to 1 (HIGH)
if ( dataOut & (1<<i) ) {
pinState = HIGH;
}
else {
pinState = LOW;
}
//sets dataPin to HIGH or LOW depending on pinState
digitalWrite(dataPin, pinState); //send bit out on rising edge of clock
digitalWrite(clockPin, HIGH);
}
digitalWrite(clockPin, LOW); //stop shifting out data
}
