Multi

The Multi class constructs objects that represent a single "breakout" module attached to the physical board. The "breakout" module will itself contain 2 or more components, such as a thermistor and a hygrometer, or an altimeter and a pressure sensor.

Supported multi sensor modules:

• BMP180
  • Adafruit
  • SparkFun
  • Grove
• BMP280
  • Adafruit
• BME280
  • Adafruit
  • Sparkfun
• HTU21D
  • Adafruit
  • Sparkfun
• HIH6130
  • Sparkfun
• MPL115A2
  • Adafruit
  • Sparkfun
• MPL3115A2
  • Adafruit
  • Sparkfun
    • SparkFun Weather Shield
    • SparkFun Photon Weather Shield
• SI7020
  • Tessel
• SI7021
  • Sparkfun
• MS5611
  • Amazon
• TH02
  • Grove
• DHT11 (Via I2C Backpack)
  • Google
• DHT21 (Via I2C Backpack)
  • Google
• DHT22 (Via I2C Backpack)
  • Google

This list will continue to be updated as more component support is implemented.

Parameters

• General Options

  Property	Type	Value/Description	Default	Required
  controller	string	BMP180, BMP280, BME280, HTU21D, HIH6130, MPL115A2, MPL3115A2, SI7020, SI7021, MS5611, TH02. The Name of the controller to use		yes
  freq	Number	In milliseconds, how often data events should fire	20	no

In addition, anything in the options object passed to the Multi constructor will be passed along to each of its constituent component sensors (e.g. Thermometer, Altimeter, etc.). See relevant sensor component class documentation for more details about what options each takes.

Shape

Some of these properties may or may not exist depending on whether the multi sensor supports it.

Property Name	Description	Read Only
accelerometer	An instance of Accelerometer class.	Yes
altimeter	An instance of Altimeter class.	Yes
barometer	An instance of Barometer class.	Yes
gyro	An instance of Gyro class.	Yes
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes
temperature	An instance of Thermometer class.	Yes

Component Initialization

BMP180

new five.Multi({
  controller: "BMP180"
});

Property Name	Description	Read Only
barometer	An instance of Barometer class.	Yes
thermometer	An instance of Thermometer class.	Yes
temperature	An instance of Thermometer class.	Yes

HTU21D

new five.Multi({
  controller: "HTU21D"
});

Shape

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes
temperature	An instance of Thermometer class.	Yes

HIH6130

new five.Multi({
  controller: "HIH6130"
});

MPL115A2

new five.Multi({
  controller: "MPL115A2"
});

Property Name	Description	Read Only
barometer	An instance of Barometer class.	Yes
thermometer	An instance of Thermometer class.	Yes
temperature	An instance of Thermometer class.	Yes

MPL3115A2

new five.Multi({
  controller: "MPL3115A2"
});

Property Name	Description	Read Only
altimeter	An instance of Altimeter class.	Yes
barometer	An instance of Barometer class.	Yes
thermometer	An instance of Thermometer class.	Yes
temperature	An instance of Thermometer class.	Yes

SI7020

new five.Multi({
  controller: "SI7020"
});

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

SI7021

new five.Multi({
  controller: "SI7021"
});

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

MS5611

new five.Multi({
  controller: "MS5611"
});

Property Name	Description	Read Only
altimeter	An instance of Altimeter class.	Yes
barometer	An instance of Barometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

TH02

new five.Multi({
  controller: "TH02"
});

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

DHT11_I2C_NANO_BACKPACK

new five.Multi({
  controller: "DHT11_I2C_NANO_BACKPACK"
});

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

DHT21_I2C_NANO_BACKPACK

new five.Multi({
  controller: "DHT21_I2C_NANO_BACKPACK"
});

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

DHT22_I2C_NANO_BACKPACK

new five.Multi({
  controller: "DHT22_I2C_NANO_BACKPACK"
});

Property Name	Description	Read Only
hygrometer	An instance of Hygrometer class.	Yes
thermometer	An instance of Thermometer class.	Yes

Usage

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {

  var multi = new five.Multi({
    controller: "MPL115A2"
  });

  multi.on("data", function() {
    console.log("Barometer: %d", this.barometer.pressure);
    console.log("Temperature: %d", this.temperature.celsius);
  });
});

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var multi = new five.Multi({
    controller: "HTU21D"
  });

  multi.on("change", function() {
    console.log("temperature");
    console.log("  celsius           : ", this.temperature.celsius);
    console.log("  fahrenheit        : ", this.temperature.fahrenheit);
    console.log("  kelvin            : ", this.temperature.kelvin);
    console.log("--------------------------------------");

    console.log("Hygrometer");
    console.log("  relative humidity : ", this.hygrometer.relativeHumidity);
    console.log("--------------------------------------");
  });
});

API

The Multi class does not have an explicit API. Refer to the individual components for their APIs

Events

• data The "data" event is fired as frequently as new data becomes available.

• change The "change" event is fired whenever a corresponding "change" is fired from any constituent component.

Note: You may also bind to events on Multi object component sensors directly, e.g. myMulti.thermometer.on('change')