Barometer

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

Supported Barometers:

• BMP180
  • Adafruit
  • SparkFun
• MPL115A2
  • Adafruit
  • SparkFun
• MPL3115A2
  • Adafruit
  • Sparkfun
    • SparkFun Weather Shield
    • SparkFun Photon Weather Shield

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, MPL3115A2. 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
  mode	number	0-3. Oversampling ratio mode.	3	No

Shape

Property Name	Description	Read Only
id	A user definable id value. Defaults to a generated uid	No
pressure	The current pressure value in kPa.	Yes

Component Initialization

BMP180

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

MPL115A2

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

MPL3115A2

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

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.