int freq_1 = 1000;
int freq_2 = 1000;
int pin_1 = 22;
int pin_2 = 27;


void setup() {
  Serial.begin(9600);
  Serial.print("Program started\n");

   pinMode(22, OUTPUT);
   pinMode(23, OUTPUT);
   pinMode(24, OUTPUT);
   pinMode(25, OUTPUT);
   pinMode(26, OUTPUT);
   pinMode(27, OUTPUT);
   pinMode(28, OUTPUT);
   pinMode(29, OUTPUT);
}

void loop() {
  Serial.print("Looped\n");

  int j = 0;
  while(j<4) {
    Serial.println(j);

  if (j == 0) {
    pin_1 = 22;
    pin_2 = 27;
  }
  if (j == 1) {
    pin_1 = 24;
    pin_2 = 29;
  }
    if (j == 2) {
    pin_1 = 26;
    pin_2 = 23;
  }
    if (j == 3) {
    pin_1 = 28;
    pin_2 = 25;
  }

    Serial.println(pin_1);
    Serial.println(pin_2);

    digitalWrite(pin_1, HIGH);
    digitalWrite(pin_2, HIGH);
    delay(freq_1);
    digitalWrite(pin_2, LOW);
    digitalWrite(pin_2, LOW);
    delay(freq_2);

    j++;

  }
}