#define red 13
#define yellow 12
#define blue 11
void setup() {
// put your setup code here, to run once:
pinMode(yellow, OUTPUT);
pinMode(red, OUTPUT);
pinMode(blue, OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite(yellow, HIGH);
digitalWrite(red, LOW);
digitalWrite(blue, LOW);
delay(500);
digitalWrite(yellow, LOW);
digitalWrite(red, HIGH);
digitalWrite(blue, LOW);
delay(500);
digitalWrite(yellow, LOW);
digitalWrite(red, LOW);
digitalWrite(blue, HIGH);
delay(500);
}