Test code for the 4x4 driver shield. Pulses all 16 outputs on and off with a 1 second delay in between.

test-4x4-driver-shield.ino

void setup() {
  //set pins to output because they are addressed in the main loop
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(13, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

  int data = 0xFF;

  digitalWrite(7, LOW); // Prepares latch
  digitalWrite(8, HIGH); // Deactivates master reset

  shiftOut(11, 13, MSBFIRST, (0xFF)); // shift data for OUT8-OUT15

  shiftOut(11, 13, MSBFIRST, 0xFF);  // shift data for OUT0-OUT7


  digitalWrite(7, HIGH);

  delay(1000);

// REPEAT WITH INVERSE
  
  data = 0x00;

  digitalWrite(7, LOW); // Prepares latch
  digitalWrite(8, HIGH); // Deactivates master reset

  shiftOut(11, 13, MSBFIRST, (0x00)); // shift data for OUT8-OUT15

  shiftOut(11, 13, MSBFIRST, 0x00);  // shift data for OUT0-OUT7


  digitalWrite(7, HIGH);

  delay(1000);

}