int led = 13;
int btn = 12;


void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(btn, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:


bool btnValue = digitalRead(btn);
if(btnValue == 1){
digitalWrite(led, HIGH);
}
if(btnValue == 0){
  digitalWrite(led,LOW);
}

Serial.println(btnValue);
}