struct Sensor {
  const uint8_t PIN;
  volatile bool pressed;
  uint8_t state;
};

Sensor B4 =  {12, false, LOW};
uint8_t pinB4;

void IRAM_ATTR ISR10L () {
  B4.pressed = true;
}

void setup() {
  pinMode(B4.PIN,INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(B4.PIN), ISR10L, CHANGE);

  Serial.begin(115200);
  Serial.println("Hello, CAMBIO!");
}

void loop() {
  if (B4.pressed) {
    B4.state = digitalRead(B4.PIN);
    Serial.print("sensor: ");
    if(B4.state == LOW) {
      Serial.println("ON");
    }
    else {
      Serial.println("OFF");
    }
    B4.pressed = false;
  }
  
  delay(500); // this speeds up the simulation
}