water_temp.js

// Break this out into separate repo.
const Grow = require('Grow.js');
const five = require('johnny-five');
const spawn = require('child_process').spawn;

// Create a new board object
const board = new five.Board()

// When board emits a 'ready' event run this start function.
board.on('ready', function start() {
  let data_interval,
    water_temp;

  // This requires OneWire support using the ConfigurableFirmata
  let thermometer = new five.Thermometer({
    controller: 'DS18B20',
    pin: 4
  });

  thermometer.on('change', function() {
    water_temp = this.celsius;
  });

  // Create a new grow instance and connect to https://grow.commongarden.org
  let grow = new Grow({
    uuid: 'meow',
    token: 'meow',

    component: 'Thermostat',

    // Properties can be updated by the API
    properties: {
      state: 'off',
      growfile: {
        temperature: {
          min: 22,
          ideal: 27,
          max: 29,
          pid: {
            k_p: 300,
            k_i: 0,
            k_d: 200,
            dt: 1
          }
        },
      },
      interval: 1000,
      threshold: 0.2,
    },

    start: function () {
      let interval = this.get('interval');
      data_interval = setInterval(()=> {
        this.temp_data();
      }, interval);

      let growfile = this.get('growfile');
      this.registerTargets(growfile);

      let threshold = this.get('threshold');

      // Listen for correction events from our PID controller
      this.on('correction', (key, correction) => {
        console.log(correction);
        if (Math.abs(correction) > threshold) {
          if (key === 'temperature') {
            if (correction > 0) {
              this.call('turn_on');
            } else {
              this.call('turn_off');
            }
          }
        }
      });
    },

    stop: function () {
      clearInterval(data_interval);
      this.removeAllListeners();
    },

    restart: function () {
      this.stop();
      this.removeTargets();
      this.start();
    },

    // Note, there are probably more elegant ways of handling subthing methods.
    turn_on: function () {
      console.log('Heater on');
      // var process = spawn('dlipower', ['--hostname', '192.168.0.100', '--user', 'admin', '--password', '1234', 'on', '4']);
      this.set('state', 'on');
    },

    turn_off: function () {
      console.log('Heater off');
      // var process = spawn('dlipower', ['--hostname', '192.168.0.100', '--user', 'admin', '--password', '1234', 'off', '4']);
      this.set('state', 'off');
    },

    temp_data: function () {
      grow.emit('temperature', water_temp);

      console.log('temperature: ' + water_temp);
    }
  });

  grow.connect({
    host: '10.0.0.198'
  });

});