#define led1 2
#define led2 4
#define led3 5
void setup() {
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
}
void loop() {
digitalWrite(led1, HIGH);
digitalWrite(led1, LOW);
digitalWrite(led1, LOW);
delay(500);
digitalWrite(led2, LOW);
digitalWrite(led2, HIGH);
digitalWrite(led2, LOW);
delay(500);
digitalWrite(led3, LOW);
digitalWrite(led3, LOW);
digitalWrite(led3, HIGH);
digitalWrite(led3, LOW);
delay(500);
}