int led = 4;
int boton =0;
int pu;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
 pinMode(boton,INPUT);
 pinMode(led,OUTPUT);
}
void loop() {
pu=digitalRead(boton);
Serial.println(pu);
if (pu==0){
      led=0;
    }
if (pu==1){
  led=1;
}
}