espruino temperature controlled relay

espruino-temp-relay.js

var dht = require("DHT22").connect(A1);

const threshold = 25;
const interval = 10;
let currentTemp = 0;

// LEDs off
LED1.write(false);
LED2.write(false);

// LED error blink
let l1 = false;
let errorInterval;

var on = false;
function setState(isOn) {
  if (on !== isOn) {
    if (isOn) {
      console.log("Turning on...");
    } else {
      console.log("Turning off...");
    }
  }
  on = isOn;
  LED1.write(on);
  digitalWrite(A0, !on);
  LED2.write(!on);
}

function turnOn() {
  setState(true);
}

function turnOff() {
  setState(false);
}

function checkTemp() {
  dht.read(function (a) {
    if (a.temp === -1) {
      console.log("Read error");
      // Just in case
      turnOn();
      if (errorInterval === undefined) {
         errorInterval = setInterval("digitalWrite(LED1,l1=!l1);",200);
      }
      return;
    }
    if (errorInterval !== undefined) {
      clearInterval(errorInterval);
      errorInterval = undefined; 
    }
    console.log("Temp is ", a.temp);
    currentTemp = a.temp;
    if (a.temp > threshold) {
      turnOn();
    } else {
      turnOff();
    }
  });
}

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