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Rick Waldron edited this page Jun 11, 2015 · 15 revisions

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

Supported Barometers:

  • MPL115A2 (I2C)
  • BMP180 (I2C)

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

ADXL345

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

ADXL345

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.

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