int botao;
int led = 4;
void setup() {
  pinMode(3, INPUT);
  pinMode(4, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  botao = digitalRead(3);
  Serial.println(botao);
   if(botao == 1){
    digitalWrite(led, HIGH);}
  else{digitalWrite(led, LOW);};
}