Similar to the previous code block (but slightly more mathematically complicated), the temperature sensor returns an analog reading of the sensor.

If we look at the manufacturer's explanation (http://wiki.seeedstudio.com/Grove-Temperature_Sensor_V1.2/) on how to read the sensor, we will discover that the sensor's v1.2 is shipped with a thermistor with the value of 4,250 as well as a 100k resistor.

Consequently, the formula for calculating the temperature value using this sensor is as follows:

The following code will give the temperature based on the sensor readings every two seconds:

var mraa = require('mraa');
var pin3 = new mraa.Aio(3);
var RESISTOR = 100000;
var THERMISTOR = 4250;
var getTemperature = function() {
  var sensorReading = pin3.read();
  var R = 1023 / sensorReading - 1;
  R = RESISTOR * R;
  var temperature = 1 / (Math.log(R/RESISTOR)/THERMISTOR+1/298.15)-273.15;
  return temperature;
};
setInterval(function() {
  console.log("Current Temperature " + getTemperature());
},2000);

The output of this code will look something like this:

Using the SSH console, these readings will be logged.