void setup() {
Serial.begin(115200);
pinMode(5, OUTPUT);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);

}

void loop() {
digitalWrite(5, HIGH);
delay(1000);
digitalWrite(5, LOW);
delay(0);
digitalWrite(2, HIGH);
delay(1000);
digitalWrite(2, LOW);
delay(0);
digitalWrite(3, HIGH);
delay(1000);
digitalWrite(3, LOW);
delay(0);
digitalWrite(4, HIGH);
delay(1000);
digitalWrite(4, LOW);
delay(0);
}