Barometer

The Barometer class constructs objects that represent a single Barometer sensor attached to the physical board.

Supported Barometers:

• BMP180
  • Adafruit
  • SparkFun
• MPL115A2
  • Adafruit

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, MPL115A2. The Name of the controller to use		Yes
  address	number	Address for I2C device.	By Device	No
  freq	number	Milliseconds. The rate in ms of data events.	25	No

• MPL115A2 Options (controller: "MPL115A2")

  Property	Type	Value/Description	Default	Required

• BMP180 Options (controller: "BMP180")

  Property	Type	Value/Description	Default	Required

Shape

{ 
  id: A user definable id value. Defaults to a generated uid
  pressure: The current pressure value in kPa. READONLY
}

Component Initialization

MPL115A2

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

BMP180

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

Usage

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

board.on("ready", function() {
  var barometer = new five.Barometer({
    controller: "MPL115A2"
  });

  barometer.on("data", function() {
    console.log("barometer");
    console.log("  pressure : ", this.pressure);
    console.log("--------------------------------------");
  });
});

API

There are no Barometer specific methods.

Events

• change The "change" event is emitted whenever the value of the barometric pressure sensor changes.

• data The "data" event is fired as frequently as the user defined freq will allow in milliseconds.