Altimeter

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

Supported Altimeters:

• BMP180
  • Adafruit
  • SparkFun
  • Grove
• BMP280
  • Adafruit
• BME280
  • Adafruit
  • Sparkfun
• MPL3115A2
  • Adafruit
  • Sparkfun
    • SparkFun Weather Shield
    • SparkFun Photon Weather Shield
• MS5611
  • Amazon

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

Parameters

• General Options

  Property	Type	Value/Description	Default	Required
  controller	string	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
  elevation	number	Meters. A reference elevation for relative changes.	1	No

Shape

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

Component Initialization

MPL3115A2

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

BMP180

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

MS5611

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

Usage

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

board.on("ready", function() {
  var barometer = new five.Altimeter({
    controller: "MPL3115A2"
  });

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

API

There are no Altimeter specific methods.

Events

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

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