Small module for the barometer brick on the UDOO Neo
npm install neo-barometerNode.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)
``javascript
// In a local project
npm install --save neo-barometer
// For global usage
npm install -g neo-barometer
`
When installed globally, the module installs four cli tools in your PATH:altitude
- : outputs altitude in meter to stdout
- : outputs pressure in pascal to stdout. Change unit with flag --unit [hpa|kpa|pa]
- : outputs temperature in Kelvin to stdout. Change unit with flag --unit [c|celcius|f|fahrenheit|K|Kelvin]
- : outputs all values in stringified JSON to stdout.
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).
`javascript
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));
``