Welcome to bme3xx-sensor, a Node.js I2C module for the Bosch BMP3xx family of Humidity, Barometric Pressure, Temperature Sensor. Adafruit sells a BMP388 breakout board and here is the 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 BMP3xx/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.
Since bme280-sensor needs to talk directly to the I2C bus and requires access to /dev/i2c, you will typically need run Node with elevated privileges or add your user account to the i2c group: $ sudo adduser $USER i2c
const BMP3xx = require('bme280-sensor');
// The BMP3xx constructor options are optional.
//
const options = {
i2cBusNo : 1, // defaults to 1
i2cAddress : BMP3xx.BMP3xx_DEFAULT_I2C_ADDRESS() // defaults to 0x77
};
const bme280 = new BMP3xx(options);
// Read BMP3xx sensor data, repeat
//
const readSensorData = () => {
bme280.readSensorData()
.then((data) => {
// temperature_C, pressure_hPa, and humidity are returned by default.
// I'll also calculate some unit conversions for display purposes.
//
data.temperature_F = BMP3xx.convertCelciusToFahrenheit(data.temperature_C);
data.pressure_inHg = BMP3xx.convertHectopascalToInchesOfMercury(data.pressure_hPa);
console.log(`data = ${JSON.stringify(data, null, 2)}`);
setTimeout(readSensorData, 2000);
})
.catch((err) => {
console.log(`BMP3xx read error: ${err}`);
setTimeout(readSensorData, 2000);
});
};
// Initialize the BMP3xx sensor
//
bme280.init()
.then(() => {
console.log('BMP3xx initialization succeeded');
readSensorData();
})
.catch((err) => console.error(`BMP3xx initialization failed: ${err} `));
##Example Output
> sudo node example.js
Found BMP3xx chip id 0x60 on bus i2c-1 address 0x77
BMP3xx initialization succeeded
data = {
"temperature_C": 32.09,
"humidity": 34.851083883116694,
"pressure_hPa": 1010.918480644477,
"temperature_F": 89.76200000000001,
"pressure_inHg": 29.852410107059583
}
##Example Wiring
For I2C setup on a Raspberry Pi, take a look at my pi-weather-station project.