espruino temperature controlled fan on Thingy:52

espruino.js

const threshold = 26.5;
const interval = 10;
let currentTemp;
let isOff;

function setLEDS(l1,l2,l3) {
  digitalWrite(LED1, l1);
  digitalWrite(LED2, l2);
  digitalWrite(LED3, l3);
}

function setIsOff(b) {
  if (b && isOff === undefined || b && !isOff) {
    console.log("Turning off.");
    // Thingy.beep(500, 100);
  } else if (!b && isOff === undefined || !b && isOff) {
    console.log("Turning on.");
    /*
    Thingy.beep(3000, 100);
    setTimeout("Thingy.beep(3000, 100)", 200);
    */
  }
  isOff = b;
  digitalWrite(D2, isOff);
}

function alert() {
  console.log("Alert: " + currentTemp);
  setIsOff(false);
  setLEDS(true,false,false);
}

function ok() {
  console.log("OK: " + currentTemp);
  setIsOff(true);
  setLEDS(false,true,false);
}

function warn() {
  setIsOff(false);
  console.log("Warning: " + currentTemp);
  setLEDS(true,true,false);
}

function onHumidity(res) {
    console.log(res.temperature);
    currentTemp = res.temperature;
    if (currentTemp > threshold) {
      alert();
    } else if (currentTemp > threshold * 0.9) {
      warn();
    } else {
      ok();
    }
}

function detect() {
  Thingy.getHumidity(onHumidity);
}


setInterval(detect, 1000 * interval);
detect();