mattrix_alpha.ino

/*
  Shift Register Example
 for 74HC595 shift register
 */

//Pin connected to latch pin (ST_CP) of 74HC595
const int latchPin = 13;
//Pin connected to clock pin (SH_CP) of 74HC595
const int clockPin = 12;
////Pin connected to Data in (DS) of 74HC595
const int dataPin = 11;

byte anodes = 0b10000000;


void setup() {
  //set pins to output because they are addressed in the main loop
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);


}

void loop() {

  
  digitalWrite(latchPin, LOW);
  
  // Cathode 0 = ON, 1 = OFF
  // RGB RGB RG
  shiftOut(dataPin, clockPin, LSBFIRST, 0b01101111);
  
  anodes >>= 1;
  if (anodes == 0) {
    anodes = 0b10000000;
  }
  
  // anodes: 1 = ON, 0 = OFF
  shiftOut(dataPin, clockPin, LSBFIRST, anodes);

  digitalWrite(latchPin, HIGH);
  
  delay(1);
}