#define PIN_LED1 7
#define PIN_LED2 6
#define PIN_LED3 5
#define PIN_LED4 4


void setup() {
  // put your setup code here, to run once:
pinMode (4, OUTPUT);
pinMode (5, OUTPUT);
pinMode (6, OUTPUT);
pinMode (7, OUTPUT);
Serial.begin(115200);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(4, HIGH);
delay(100);
digitalWrite(4, LOW);
delay(100);
digitalWrite(5, HIGH);
delay(100);
digitalWrite(5, LOW);
delay(100);
digitalWrite(6, HIGH);
delay(100);
digitalWrite(6, LOW);
delay(100);
digitalWrite(7, HIGH);
delay(100);
digitalWrite(7, LOW);
delay(100);
digitalWrite(6, HIGH);
delay(100);
digitalWrite(6, LOW);
delay(100);
digitalWrite(5, HIGH);
delay(100);
digitalWrite(5, LOW);
delay(100);
digitalWrite(4, HIGH);
delay(50);

}