#define R1 2
#define R2 3
#define R3 4
#define BUZZ 5
#define SENSOR 13
int VALOR;
void setup() {
  // put your setup code here, to run once:
 pinMode(R1, OUTPUT);
 pinMode(R2, OUTPUT);
 pinMode(R3, OUTPUT);
 pinMode(BUZZ, OUTPUT);
 pinMode(SENSOR, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 VALOR=digitalRead(SENSOR);
 if(VALOR==HIGH)
 {
  analogWrite(BUZZ, 10);
  for(int I=0;I<3;I++)
  {
    digitalWrite(R3, HIGH);
    delay(200);
    digitalWrite(R3, LOW);
    delay(200);
    digitalWrite(R2, HIGH);
    delay(200);
    digitalWrite(R2, LOW);
    delay(200);
    digitalWrite(R1, HIGH);
    delay(200);
    digitalWrite(R1, LOW);
    delay(200);
  }
  for(int I=0;I<20;I++)
  {
    digitalWrite(R1, HIGH);
    digitalWrite(R2, HIGH);
    digitalWrite(R3, HIGH);
    delay(200);
    digitalWrite(R1, LOW);
    digitalWrite(R2, LOW);
    digitalWrite(R3, LOW);
    delay(200);
  }
 }
 else
 {
  digitalWrite(R1, LOW);
  digitalWrite(R2, LOW);
  digitalWrite(R3, LOW);
  digitalWrite(BUZZ, LOW);
 }
}