mtex-bmp280

BMP 280 sensor library
=========

A Node.js I2C module for the Bosch BMP280 Barometric Pressure and Temperature Sensor - datasheet.

This module uses i2c-bus which should provide access with Node.js on Linux boards like the Raspberry Pi Zero, 1, 2, or 3, BeagleBone, BeagleBone Black, or Intel Edison.

Note: While the BMP280 device does report temperature, it is measured by the internal temperature sensor. This temperature value depends on the PCB temperature and sensor element self-heating.
Therefore ambient temperature is typically reported above actual ambient temperature.

This module is largely inspired by skylarstein's bme280-sensor library.

However, the main difference is - this library provides a way to setup the sensor - mode, oversampling, etc.

Installation

``shell
npm install bmp280-sensor --save
`

Example Code

`
const BMP280 = require('bmp280-sensor');
const options = {
i2cBusNumber : 1, // defaults to 1
i2cAddress : 0x76, // defaults to 0x76
verbose : true
};
const bmp280 = new BMP280(options);

bmp280.config({
powerMode: 1, // 0 - sleep, 1|2 - one measurement, 3 - continuous
pressureOversampling: 3, // 0 - Skipped, 1 - ×1, 2 - ×2, 3 - ×4, 4 - ×8, 5 - ×16
temperatureOversampling: 1, // 0 - Skipped, 1 - ×1, 2 - ×2, 3 - ×4, 4 - ×8, 5 - ×16
iirFilter: 2, // Coefficient: 0 - off, 1 - 2, 2 - 4, 3 - 8, 4 - 16
standby: 4 // 0 - 0.5ms, 1 - 62.5ms, 2 - 125ms, 3 - 250ms, 4 - 500ms, 5 - 1000ms, 6 - 2000ms, 7 - 4000ms
});

console.log(Reading sensors);
bmp280.readSensors()
.then((data) => {
console.log(Temperture:\t${data.Temperature});
console.log(Pressure:\t${data.Pressure});
})
.then(() => {
bmp280.close();
})
.catch((err) => {
console.log(err);
bmp280.close();
});

process.on('SIGINT', () => {
bmp280.close();
process.exit();
});
`

Example Output

`
> node example.js
Found BMx280 chip ID 0x58 on bus i2c-1, address 0x76
BMP280 cal = {
"dig_T1": 28057,
"dig_T2": 26787,
"dig_T3": -1000,
"dig_P1": 36945,
"dig_P2": -10608,
"dig_P3": 3024,
"dig_P4": 2509,
"dig_P5": 153,
"dig_P6": -7,
"dig_P7": 15500,
"dig_P8": -14600,
"dig_P9": 6000
}
Reading sensors
Temperture: 34.16
Pressure: 1016.8900275234026
``