Bme680.sample.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Device.I2c;
using System.Threading;
using Iot.Device.Bmxx80;
using Iot.Device.Common;
using UnitsNet;

Console.WriteLine("Hello BME680!");

// The I2C bus ID on the Raspberry Pi 3.
const int busId = 1;
// set this to the current sea level pressure in the area for correct altitude readings
Pressure defaultSeaLevelPressure = WeatherHelper.MeanSeaLevel;

I2cConnectionSettings i2cSettings = new(busId, Bme680.DefaultI2cAddress);
I2cDevice i2cDevice = I2cDevice.Create(i2cSettings);

using Bme680 bme680 = new Bme680(i2cDevice, Temperature.FromDegreesCelsius(20.0));

while (true)
{
    // reset will change settings back to default
    bme680.Reset();

    // 10 consecutive measurement with default settings
    for (var i = 0; i < 10; i++)
    {
        // Perform a synchronous measurement
        var readResult = bme680.Read();

        // Print out the measured data
        Console.WriteLine($"Gas resistance: {readResult.GasResistance?.Ohms:0.##}Ohm");
        Console.WriteLine($"Temperature: {readResult.Temperature?.DegreesCelsius:0.#}\u00B0C");
        Console.WriteLine($"Pressure: {readResult.Pressure?.Hectopascals:0.##}hPa");
        Console.WriteLine($"Relative humidity: {readResult.Humidity?.Percent:0.#}%");

        if (readResult.Temperature.HasValue && readResult.Pressure.HasValue)
        {
            var altValue = WeatherHelper.CalculateAltitude(readResult.Pressure.Value, defaultSeaLevelPressure, readResult.Temperature.Value);
            Console.WriteLine($"Altitude: {altValue.Meters:0.##}m");
        }

        if (readResult.Temperature.HasValue && readResult.Humidity.HasValue)
        {
            // WeatherHelper supports more calculations, such as saturated vapor pressure, actual vapor pressure and absolute humidity.
            Console.WriteLine($"Heat index: {WeatherHelper.CalculateHeatIndex(readResult.Temperature.Value, readResult.Humidity.Value).DegreesCelsius:0.#}\u00B0C");
            Console.WriteLine($"Dew point: {WeatherHelper.CalculateDewPoint(readResult.Temperature.Value, readResult.Humidity.Value).DegreesCelsius:0.#}\u00B0C");
        }

        // when measuring the gas resistance on each cycle it is important to wait a certain interval
        // because a heating plate is activated which will heat up the sensor without sleep, this can
        // falsify all readings coming from the sensor
        Thread.Sleep(1000);
    }

    // change the settings
    bme680.TemperatureSampling = Sampling.HighResolution;
    bme680.HumiditySampling = Sampling.UltraHighResolution;
    bme680.PressureSampling = Sampling.Skipped;

    bme680.ConfigureHeatingProfile(Bme680HeaterProfile.Profile2, Temperature.FromDegreesCelsius(280), Duration.FromMilliseconds(80), Temperature.FromDegreesCelsius(24));
    bme680.HeaterProfile = Bme680HeaterProfile.Profile2;

    // 10 consecutive measurements with custom settings
    for (int i = 0; i < 10; i++)
    {
        // Perform an asynchronous measurement
        var readResult = await bme680.ReadAsync();

        // Print out the measured data
        Console.WriteLine($"Gas resistance: {readResult.GasResistance?.Ohms:0.##}Ohm");
        Console.WriteLine($"Temperature: {readResult.Temperature?.DegreesCelsius:0.#}\u00B0C");
        Console.WriteLine($"Pressure: {readResult.Pressure?.Hectopascals:0.##}hPa");
        Console.WriteLine($"Relative humidity: {readResult.Humidity?.Percent:0.#}%");

        if (readResult.Temperature.HasValue && readResult.Pressure.HasValue)
        {
            var altValue = WeatherHelper.CalculateAltitude(readResult.Pressure.Value, defaultSeaLevelPressure, readResult.Temperature.Value);
            Console.WriteLine($"Altitude: {altValue.Meters:0.##}m");
        }

        if (readResult.Temperature.HasValue && readResult.Humidity.HasValue)
        {
            // WeatherHelper supports more calculations, such as saturated vapor pressure, actual vapor pressure and absolute humidity.
            Console.WriteLine($"Heat index: {WeatherHelper.CalculateHeatIndex(readResult.Temperature.Value, readResult.Humidity.Value).DegreesCelsius:0.#}\u00B0C");
            Console.WriteLine($"Dew point: {WeatherHelper.CalculateDewPoint(readResult.Temperature.Value, readResult.Humidity.Value).DegreesCelsius:0.#}\u00B0C");
        }

        Thread.Sleep(1000);
    }
}