Blynk & Tessel 2 Example

// I used "Generic Board + WiFi" for my Blynk Project Device Settings
// I added one button setup as a switch mapped to V1 (Blynk Virtual Pin 1) that outputs 0 or 1 to toggle one of the on board LEDs
// I added another button setup as a push button mapped to V0 (Blynk Virtual Pin 0) that outputs 0 or 1 to toggle a Tessel relay

// I had to use --full option when loading the code on the T2 for the blynk-library to run properly

// Example Code Running on Tessel 2
var tessel = require('tessel');

var RelayLib = require('relay-mono');
var relay = RelayLib.use(tessel.port['B']);

var BlynkLib = require('blynk-library');
var blynk = new BlynkLib.Blynk('YOUR_BLYNK_PROJECT_AUTH_TOKEN_HERE'); // use the auth token generated for your project in the Blynk app

var v0 = new blynk.VirtualPin(0); // setup a button in the Blynk app mapped to Virtual Pin 0
var v1 = new blynk.VirtualPin(1); // setup a button in the Blynk app mapped to Virtual Pin 1

v0.on('write', function(val) {

  console.log(`v0: ${val}`);

  if ( val == 1 ) {
    relay.turnOn(1, function(err) {
      console.log('Relay [1] is closed...');
    });
  }
  else {
    relay.turnOff(1, function(err) {
      console.log('Relay [1] is open...')
    });
  }

});
 
v1.on('write', function(val) {

  console.log(`v1: ${val}`);

  if ( val == 1 ) {
    tessel.led[3].on();
    console.log('LED [3] is on...');
  }
  else {
    tessel.led[3].off();
    console.log('LED [3] is off...');
  }

});