STEP 1

Note: Temperature and humidity readings can be skewed by the operating temperature of the Tessel. Distancing the the climate module from the Tessel via wires is recommended for accurate readings.

Make a directory inside your “tessel-code” folder called “climate”, change directory into that folder, and initialize a tessel project:

mkdir climate; cd climate; t2 init

STEP 2

Plug the climate module into Tessel port A with the hexagon/icon side down and the electrical components on the top, then plug Tessel into your computer via USB.

STEP 3

Install by typing npm install climate-si7020 into the command line.

STEP 4

Rename “index.js” to “climate.js” and replace the file’s contents with the following:

// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/publicdomain/zero/1.0/

/*********************************************
This basic climate example logs a stream
of temperature and humidity to the console.
*********************************************/

var tessel = require('tessel');
var climatelib = require('climate-si7020');

var climate = climatelib.use(tessel.port['A']);

climate.on('ready', function () {
  console.log('Connected to climate module');

  // Loop forever
  setImmediate(function loop () {
    climate.readTemperature('f', function (err, temp) {
      climate.readHumidity(function (err, humid) {
      console.log('Degrees:', temp.toFixed(4) + 'F', 'Humidity:', humid.toFixed(4) + '%RH');
      setTimeout(loop, 300);
      });
    });
  });
});

climate.on('error', function(err) {
  console.log('error connecting module', err);
});

Save the file.

STEP 5

In your command line, t2 run climate.js See the temperature and humidity change if you cup your hands and breathe on the module.

Bonus: Change the code so the temperature reads out in celsius rather than Fahrenheit.

STEP 6

What else can you do with a climate module? Try a community-created project.