int a = 12;
int b = 14;
int c = 27;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  
}

void loop() {

  digitalWrite(a, HIGH);
  delay(2000);
  digitalWrite(a, LOW);
  delay(2000);
  digitalWrite(b, HIGH);
  delay(2000);
  digitalWrite(b, LOW);
  delay(2000);
  digitalWrite(c, HIGH);
  delay(2000);
  digitalWrite(c, LOW);
  delay(2000);
  // put your main code here, to run repeatedly:
 // this speeds up the simulation
}