void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(2,OUTPUT);
  pinMode(19,OUTPUT);
  pinMode(21,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2,HIGH);
  delay(2000);
  digitalWrite(2,LOW);
  delay(2000);
  digitalWrite(19,HIGH);
  delay(300);
  digitalWrite(19,LOW);
  delay(300);
  digitalWrite(21,HIGH);
  delay(2000);
  digitalWrite(21,LOW);
  delay(2000);
}