#define BTN_PIN 15
#define LED_PIN 23
int btn_state;
void setup() {
  Serial.begin(115200);
  pinMode(BTN_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  btn_state = digitalRead(BTN_PIN);
  /*Serial.print("Button state : ");
  Serial.println(btn_state);
  delay(1000);*/
  if (btn_state == HIGH){
    digitalWrite(LED_PIN, HIGH);
  }
  else {
    digitalWrite(LED_PIN, LOW);
  }
  delay(100);
}