const int LED_PIN_1 = 2;
const int LED_PIN_3 = 2;
const int LED_PIN_2 = 15;
const int LED_PIN_4 = 15;
const int LOGIC_ANALYZER_PIN = 7;
const int DELAY_VALUE = 30;
const int LOOP_ITERATIONS = 10000;

void setup() {
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_3, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  pinMode(LED_PIN_4, OUTPUT);
}

void loop() {
  for (int i = 0; i <=10000; i = i+30) {
    digitalWrite(LED_PIN_1, HIGH);
    delay(i);
    digitalWrite(LED_PIN_3, LOW);
    delay(i);
 
    digitalWrite(LED_PIN_2, HIGH);
    delay(i);
    digitalWrite(LED_PIN_4, LOW);
    delay(i);
  }
}