README.md

BMP180 - barometer, altitude and temperature sensor

BMP180 is a device that read barometric pressure, altitude and temperature. I2C can be used to communicate with the device.

Documentation

Datasheet for the BMP180.

Usage

An example on how to use this device binding is available in the samples folder.

// bus id on the raspberry pi 3
const int busId = 1;

I2cConnectionSettings i2cSettings = new(busId, Bmp180.DefaultI2cAddress);
using I2cDevice i2cDevice = I2cDevice.Create(i2cSettings);

using Bmp180 i2cBmp280 = new(i2cDevice);
// set samplings
i2cBmp280.SetSampling(Sampling.Standard);

// read values
Temperature tempValue = i2cBmp280.ReadTemperature();
Console.WriteLine($"Temperature: {tempValue.DegreesCelsius:0.#}\u00B0C");
Pressure preValue = i2cBmp280.ReadPressure();
Console.WriteLine($"Pressure: {preValue.Hectopascals:0.##}hPa");

// Note that if you already have the pressure value and the temperature, you could also calculate altitude by
// calling WeatherHelper.CalculateAltitude(preValue, Pressure.MeanSeaLevel, tempValue) which would be more performant.
Length altValue = i2cBmp280.ReadAltitude(WeatherHelper.MeanSeaLevel);

Console.WriteLine($"Altitude: {altValue:0.##}m");
Thread.Sleep(1000);

// set higher sampling
i2cBmp280.SetSampling(Sampling.UltraLowPower);

// read values
tempValue = i2cBmp280.ReadTemperature();
Console.WriteLine($"Temperature: {tempValue.DegreesCelsius:0.#}\u00B0C");
preValue = i2cBmp280.ReadPressure();
Console.WriteLine($"Pressure: {preValue.Hectopascals:0.##}hPa");

// Note that if you already have the pressure value and the temperature, you could also calculate altitude by
// calling WeatherHelper.CalculateAltitude(preValue, Pressure.MeanSeaLevel, tempValue) which would be more performant.
altValue = i2cBmp280.ReadAltitude(WeatherHelper.MeanSeaLevel);
Console.WriteLine($"Altitude: {altValue:0.##}m");

The following fritzing diagram illustrates one way to wire up the BMP180 with a Raspberry Pi using I2C.