AURDUINO CODE

void setup() {

  // put your setup code here, to run once:

pinMode(7,OUTPUT);

pinMode(8,OUTPUT);

}

void loop() {

  // put your main code here, to run repeatedly:

digitalWrite(7,HIGH);

digitalWrite(8,LOW);

delay(2000);

digitalWrite(7,LOW);

digitalWrite(8,LOW);

delay(2000);

digitalWrite(7,LOW);

digitalWrite(8,HIGH);

delay(2000);

}