public async Task <double> GetPressure()
{
using (var sensor = new Bme280(_bmp280))
{
sensor.SetPowerMode(PowerMode.Forced);
double pressure = await sensor.ReadPressureAsync();
var temp = await sensor.ReadTemperatureAsync();
var alt = await sensor.ReadAltitudeAsync(pressure);
double humid = await sensor.ReadHumidityAsync();
_logger.LogDebug(
$"Pressure value: {pressure}; PowerMode: {sensor.ReadPowerMode()}; Temperature: {temp.Celsius}; Altitude: {alt}; Humidity: {humid}");
return(pressure);
}
}
public ISensorReading ReadSensor()
{
var result = new HumidityTemperatureAltitudePressureReading();
using (_sensor)
{
_sensor.SetPowerMode(Bmx280PowerMode.Forced);
//set samplings
_sensor.SetTemperatureSampling(Sampling.UltraLowPower);
_sensor.SetPressureSampling(Sampling.UltraLowPower);
_sensor.SetHumiditySampling(Sampling.UltraLowPower);
result.Humidity = _sensor.ReadHumidityAsync().Result;
result.Temperature = _sensor.ReadTemperatureAsync().Result;
result.Altitude = _sensor.ReadAltitudeAsync(defaultSeaLevelPressure).Result;
result.Pressure = _sensor.ReadPressureAsync().Result;
}
return(result);
}
static async Task Main(string[] args)
{
Console.WriteLine("Hello Bme280!");
//bus id on the raspberry pi 3
const int busId = 1;
//set this to the current sea level pressure in the area for correct altitude readings
const double defaultSeaLevelPressure = 1033.00;
var i2cSettings = new I2cConnectionSettings(busId, Bme280.DefaultI2cAddress);
var i2cDevice = new UnixI2cDevice(i2cSettings);
var i2CBmpe80 = new Bme280(i2cDevice);
using (i2CBmpe80)
{
while (true)
{
////set mode forced so device sleeps after read
i2CBmpe80.SetPowerMode(PowerMode.Forced);
//set samplings
i2CBmpe80.SetTemperatureSampling(Sampling.UltraLowPower);
i2CBmpe80.SetPressureSampling(Sampling.UltraLowPower);
//read values
Temperature tempValue = await i2CBmpe80.ReadTemperatureAsync();
Console.WriteLine($"Temperature {tempValue.Celsius}");
double preValue = await i2CBmpe80.ReadPressureAsync();
Console.WriteLine($"Pressure {preValue}");
double altValue = await i2CBmpe80.ReadAltitudeAsync(defaultSeaLevelPressure);
Console.WriteLine($"Altitude: {altValue}");
Thread.Sleep(1000);
//set higher sampling
i2CBmpe80.SetTemperatureSampling(Sampling.LowPower);
Console.WriteLine(i2CBmpe80.ReadTemperatureSampling());
i2CBmpe80.SetPressureSampling(Sampling.UltraHighResolution);
Console.WriteLine(i2CBmpe80.ReadPressureSampling());
//set mode forced and read again
i2CBmpe80.SetPowerMode(PowerMode.Forced);
//read values
tempValue = await i2CBmpe80.ReadTemperatureAsync();
Console.WriteLine($"Temperature {tempValue}");
preValue = await i2CBmpe80.ReadPressureAsync();
Console.WriteLine($"Pressure {preValue}");
altValue = await i2CBmpe80.ReadAltitudeAsync(defaultSeaLevelPressure);
Console.WriteLine($"Altitude: {altValue}");
Thread.Sleep(5000);
//set sampling to higher
i2CBmpe80.SetTemperatureSampling(Sampling.UltraHighResolution);
Console.WriteLine(i2CBmpe80.ReadTemperatureSampling());
i2CBmpe80.SetPressureSampling(Sampling.UltraLowPower);
Console.WriteLine(i2CBmpe80.ReadPressureSampling());
}
}
}