//ESP32 74HC595 Shift Register Test with LEDs

//ESP32 PINS
const int LATCHPIN = 2;                                       //1
const int CLOCKPIN = 4;
const int DATAPIN = 0;

byte sensor_numbers[9] = {                                    //2
  B00000000,  //all off
  B00000001,  //Pin 1
  B00000010,  //Pin 2
  B00000100,  //Pin 3
  B00001000,  //Pin 4
  B00010000,  //Pin 5
  B00100000,  //Pin 6
  B01000000,  //Pin 7
  B10000000,  //Pin 8
};

void setup() {
  pinMode(LATCHPIN ,OUTPUT);                                  //3
  pinMode(CLOCKPIN ,OUTPUT);
  pinMode(DATAPIN ,OUTPUT);
}

void loop() {
  powerSwitch(0);                                             //4
  delay(1000);
  powerSwitch(1);
  delay(1000);
  powerSwitch(2);
  delay(1000);
  powerSwitch(3);
  delay(1000);
}

//Power Supply Function
void powerSwitch(byte pin){                                   //5
  digitalWrite(LATCHPIN, LOW);                                //6
  shiftOut(DATAPIN, CLOCKPIN, MSBFIRST, sensor_numbers[pin]); //7
  digitalWrite(LATCHPIN, HIGH);                               //8
}