var logger = require('winston');
var sensor = require("ds18x20")

module.exports.start = function(channel){
  logger.info("Starting External temperature module");
  var isLoaded = sensor.isDriverLoaded();
  if(isLoaded){
    console.log(isLoaded);
    var devices = sensor.list();
    console.log(devices);
    setInterval(function () {
      var temperature = readSensor(devices, channel);
    }, 5000);
  }


}

function readSensor(devices) {
  // Read Sensor data
  sensor.get(devices[devices.length - 1], function(err, temp){
  	if(err){
  		console.log(err);
  	}
  	channel.emit('temperature_external', { temperature: temp });
  });
  // give random data for testing
  // var high = 25;
  // var low = 23;
  // var temp =  Math.random() * (high - low) + low
}