#define buzzer 2
#define echo 6
#define trigger 7
#define ledVerm 3
#define ledVerde 4

int duracao = 0;
int distancia = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(buzzer, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(trigger, OUTPUT);
  pinMode(ledVerm, OUTPUT);
  pinMode(ledVerde, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  duracao = pulseIn(echo, HIGH);
  distancia = duracao*0.017;
  Serial.println(distancia);
  delay(1000);

  if(distancia < 25){
    digitalWrite(ledVerde, LOW);
    delay(100);
    digitalWrite(buzzer, HIGH);
    delay(150);
    digitalWrite(buzzer, LOW);
    digitalWrite(ledVerm, HIGH);
  } else {
    digitalWrite(ledVerm, LOW);
    delay(100);
    digitalWrite(ledVerde, HIGH);
  }

  
}