#define Botao 16 
#define buzzer 21 
#define ledV 4 
#define ledA 17 

void setup() {
  Serial.begin(9600);            
  pinMode(Botao, INPUT_PULLUP); 
  pinMode(buzzer, OUTPUT);
  pinMode(ledV, OUTPUT); 
  pinMode(ledA, OUTPUT);   
}

void loop() {
  int EstadodB = digitalRead(Botao); 
  if (EstadodB == LOW) {
    Serial.println("BOTÂO PRESSIONADO");
    digitalWrite(buzzer, HIGH); 
    digitalWrite(ledV, HIGH); 
    digitalWrite(ledA, HIGH); 
  }
  else {
    Serial.println("BOTÂO NÂO PRESSIONADO");
    digitalWrite(buzzer, LOW);  
    digitalWrite(ledV, LOW);
    digitalWrite(ledA, LOW); 
  }
}