hts221-sensor

HTS221 I2C temperature and humidity sensor module for Node.js on Linux boards like the Raspberry Pi or BeagleBone.

Supports Node.js versions 10, 12, 14, 15 and 16.

Contents

• Features
• Installation
• Usage
  • Report Temperature and Humidity
  • Report Temperature and Humidity Continuously
• API
• Related Packages

Features

• Simple temperature and humidity sensing
• Promise based asynchronous API

Installation

npm install hts221-sensor

Usage

Report Temperature and Humidity

'use strict';

const hts221 = require('hts221-sensor');

hts221.open().then(sensor =>
  sensor.read().
  then(reading => {
    console.log('celsius: ' + reading.celsius);
    console.log('humidity: ' + reading.humidity);
  }).
  then(_ => sensor.close())
).catch(console.log);

Report Temperature and Humidity Continuously

const hts221 = require('hts221-sensor');

hts221.open().then(sensor =>
  setInterval(_ =>
    sensor.read().
    then(reading => {
      console.log('celsius: ' + reading.celsius);
      console.log('humidity: ' + reading.humidity);
    }).catch(console.log),
    1000
  )
).catch(console.log);

API

Functions

• open([options])

Class Hts221

• close()
• read()

open([options])

Returns a promise for a Hts221 object.

The following options are supported:

• i2cBusNumber - integer, I2C bus number, optional, default 1
• i2cAddress - integer, Hts221 I2C address, optional, default 0x5f

close()

Returns a promise which will resolve when all resources used by the HTS221 object have been freed.

read()

Returns a promise for an object containing a sensor reading.

Sensor Reading

• celsius - number, temperature in degrees Celsius
• humidity - number, relative humidity in percent

Related Packages

• onoff - GPIO access and interrupt detection
• i2c-bus - I2C serial bus access