const int PIN_10 = 10;
const int PIN_11 = 11;
const int PIN_12 = 12;

void setup() 
{
  pinMode(PIN_10, OUTPUT);
  pinMode(PIN_11, OUTPUT);
  pinMode(PIN_12, OUTPUT);
}


void loop()
{
int pencacah;

pencacah = 1;
while (pencacah <= 3)
{
digitalWrite(PIN_12, HIGH);
delay(1000);
digitalWrite(PIN_12, LOW);
delay(1000);
pencacah++;
}

pencacah = 1;
while (pencacah <= 3)
{
digitalWrite(PIN_11, HIGH);
delay(1000);
digitalWrite(PIN_11, LOW);
delay(1000);
pencacah++;
}

pencacah = 1;
while (pencacah <= 3)
{
digitalWrite(PIN_10, HIGH);
delay(1000);
digitalWrite(PIN_10, LOW);
delay(1000);
pencacah++;
}
}