int led1 = 12, led2 = 14, led3 = 27;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}
void loop() {
  digitalWrite(led1, HIGH);
  delay(100);
  digitalWrite(led1, LOW);
  delay(100);
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led2, LOW);
  delay(100);
  digitalWrite(led3, HIGH);
  delay(100);
  digitalWrite(led3, LOW);
  delay(100);
}