int ledbiru = 19;
int ledmerah = 18;
int ledkuning = 5; 
int tombol = 15;
int a =0;
int b =0;

void setup()
{
  pinMode(ledbiru, OUTPUT);
  pinMode(ledmerah, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  pinMode(tombol, INPUT);
  
}
void loop()
{
  a=digitalRead(tombol);
  while(a==HIGH && b ==0)
  {
  digitalWrite(ledbiru, HIGH); //menyalakan pinled
  delay(1000);// jeda 1 detik
  digitalWrite(ledbiru, LOW); //mematikan pinled
  delay(1000); //jeda 1 detik
  digitalWrite(ledmerah, HIGH); //mematikan pinled
  delay(1000); //jeda 1 detik
  digitalWrite(ledmerah, LOW); //mematikan pinled
  delay(1000); //jeda 1 detik
  digitalWrite(ledkuning, HIGH); //mematikan pinled
  delay(1000); //jeda 1 detik
  digitalWrite(ledkuning, LOW); //mematikan pinled
  delay(1000); //jeda 1 detik
  b = 1;
  }
  while (a==LOW && b == 1)
  {
  digitalWrite(ledbiru, LOW); //menyalakan pinled
  digitalWrite(ledbiru, LOW); //mematikan pinled
  digitalWrite(ledmerah, LOW); //mematikan pinled
  digitalWrite(ledmerah, LOW); //mematikan pinled
  digitalWrite(ledkuning, LOW); //mematikan pinled
  digitalWrite(ledkuning, LOW); //mematikan pinled
  b =0;
  }
}