#define speaker1 19



void setup() {
  // array of GPIO pins
  int ledPins[] = {15, 2, 4, 5};
  int numLeds = 4;
  int i = 0;
  int j =0;

  pinMode(speaker1, OUTPUT);



    for (i=0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
    }

  for (i=0; i < 40; i++) {
    if( ( i % 10==0)
      {
        digitalWrite(ledPins[j], HIGH);
        Serial.print("j: ");
        Serial.print(j);

        // make sound
        tone(speaker1, 170 + 100*i); // Send 1200KHz sound signal, which is a G tone
        delay(50);
        noTone(speaker1); // Stop sound
        delay(10);

        j++;
        delay(250);
      }
   
    }
  




void loop() {
  // No code needed in the loop for this example
}