void setup() {
pinMode(11, OUTPUT);
pinMode(7, OUTPUT);
pinMode(9, OUTPUT);
}
void loop() {

digitalWrite(11, HIGH);
digitalWrite(9, LOW);
digitalWrite(7, LOW);
delay(1000);
digitalWrite(11, LOW);
digitalWrite(9, HIGH);
digitalWrite(7, LOW);
delay(1000);
digitalWrite(11, LOW);
digitalWrite(9, LOW);
digitalWrite(7, HIGH);
delay(1000);
}