Espruino DS18B20 and BMP085 sensors

espruino.js

const wifi = require('Wifi');
const http = require('http');
const DS18B20 = require('DS18B20');
const BMP085 = require('BMP085');

const wifiSSID = 'cool';
const wifiKey = 'secret';

const tempProbePin = NodeMCU.D3;
const atmospherePins = {
  scl: NodeMCU.D1,
  sda: NodeMCU.D2
};

var sensors;

const onInit = () => {
  sensors = initSensors();
  wifiConnect(() => {
    webserviceStart();
  });
};

const initSensors = () => {
  // DS18B20 sensor API.
  const oneWire = new OneWire(tempProbePin);
  const tempProbe = DS18B20.connect(oneWire);

  // BMP085 sensor API.
  I2C1.setup(atmospherePins);
  const atmosphere = BMP085.connect(I2C1);

  return {
    tempProbe: tempProbe,
    atmosphere: atmosphere
  };
};

const wifiConnect = (cb) => {
  wifi.connect(wifiSSID, {
    password: wifiKey
  }, (err) => {
    if (err)
      console.log(err);
    else {
      console.log('Connected!');
      cb();
    }
  });
  wifi.setDHCPHostname('joe');
  wifi.save();
};

const webserviceStart = () => {
  http
    .createServer(onPageRequest)
    .listen(80);
};

const onPageRequest = (req, res) => {
  sensors.atmosphere.getPressure((atm) => {
    const sensorData = {
      tempProbe: sensors.tempProbe.getTemp(),
      atmosphere: atm
    };
    res.writeHead(200, {
      'Content-Type': 'application/json'
    });
    res.end(JSON.stringify(sensorData));
  });
};