neo-barometer

Node.js module for retrieving data from the barometer brick for the UDOO Neo. Gets atmospheric pressure in pascals, temperature in kelvin and altitude in meters.

A note on altitude: the value is derived from measured temperature, measured atmospheric pressure and a fixed atmospheric pressure at sea level (P0, 1013.25 hPa). P0 could be different at your location, so the calculed altitude might not be accurate.

Important: this modules uses ES2015 (ES6) features, so use a modern version of node.js (v4.x, v5.x etc)

Installation

// In a local project
npm install --save neo-barometer
 
// For global usage
npm install -g neo-barometer

Usage (cli)

When installed globally, the module installs four cli tools in your PATH:

• altitude: outputs altitude in meter to stdout
• pressure [--unit hpa]: outputs pressure in pascal to stdout. Change unit with flag --unit [hpa|kpa|pa]
• temperature [--unit celcius]: outputs temperature in Kelvin to stdout. Change unit with flag --unit [c|celcius|f|fahrenheit|K|Kelvin]
• barometer: outputs all values in stringified JSON to stdout.

Usage (module)

The module exports four Readable Streams:

• barometer.Temperature: a stream of temperature values in degrees celcius.
• barometer.Pressure: a stream of atmospheric pressure values in pascals.
• barometer.Altitude: a stream of altitude values in meters.
• barometer.Compound: a stream of objects that contain all three values (temperature, pressure & altitude).

let barometer = require('neo-barometer');
 
// 1. Just temperature
let temperature = new barometer.Temperature();
temperature.on('data', console.log.bind(console));
temperature.on('error', console.error.bind(console));
 
// 2. Just pressure 
let pressure = new barometer.Pressure();
pressure.on('data', console.log.bind(console));
pressure.on('error', console.error.bind(console));
 
// 3. Just altitude
let altitude = new barometer.Altitude();
altitude.on('data', console.log.bind(console));
altitude.on('error', console.error.bind(console));
 
// 4. Compound (all values)
let compound = new barometer.Compound();
compound.on('data', console.log.bind(console));
compound.on('error', console.error.bind(console));