#define LED1_PIN 22
#define LED1_PIN 21
#define LED1_PIN 23

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(22, OUTPUT);
pinMode(21, OUTPUT);
pinMode(23, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(22, HIGH);
digitalWrite(21, LOW);
digitalWrite(23, LOW);
delay(100);
digitalWrite(22, LOW);
digitalWrite(21, HIGH);
digitalWrite(23, LOW);
delay(100);
digitalWrite(22, LOW);
digitalWrite(21, LOW);
digitalWrite(23, HIGH);
delay(100);
}