Multiple climate modules on one Tessel

[Summer]

Hello all,

I'm wondering how many climate modules one can connect to one tessel device. From the looks of it I would say 4, but does the software also support it?

How would I access all modules in code?

Thanks!

[ekolker]

Hey Summer

You can connect at most two of the Climate Modules to Tessel, and they will have to be on opposite sides of the board so that they use different I2C buses.

Also note that the errata described here, which has to do with the Si7005's improper handling of I2C traffic, will mean that you should not use any other I2C modules (Servo, Accelerometer, and RFID) with the Tessel if you have a Climate Module on each I2C bus.

[ekolker]

...and to answer the second half of your question, your code might looks something like this:

var tessel = require('tessel');

var climateDriver = require('climate-si7005');
var firstSensor = climateDriver.use(tessel.port('A'));
var secondSensor = null;

firstSensor.on('ready', function () {
  secondSensor = climateDriver.use(tessel.port('C'));
  secondSensor.on('ready', function () {
    console.log('Connected to both modules');
    // Loop forever
    setImmediate(function loop () {
      firstSensor.readTemperature('f', function (err, temp) {
        secondSensor.readHumidity(function (err, humid) {
          console.log('Degrees:', temp.toFixed(4) + 'F', 'Humidity:', humid.toFixed(4) + '%RH');
          setTimeout(loop, 300);
        });
      });
    });
  });
});
firstSensor.on('error', function(err) {
  console.log('something went wrong with the module on port A:\n', err);
});
secondSensor.on('error', function(err) {
  console.log('something went wrong with the module on port C:\n', err);
});