#define PIN_BUTTON 37
int state_btn = HIGH;


void setup() {
  // put your setup code here, to run once:
pinMode(PIN_BUTTON,INPUT_PULLUP);
Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
int state_new = digitalRead(PIN_BUTTON);
if (state_btn && !state_new) {
Serial.println("pressed");
}
state_btn = state_new;
delay(1);
}