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Meadow.Foundation.Sensors.Atmospheric.Bmp280

Bmp280
StatusStatus badge: working
Source codeGitHub
Datasheet(s)GitHub
NuGet packageNuGet Gallery for Meadow.Foundation.Sensors.Atmospheric.Bmx280

Code Example​

Bmp280 sensor;

publicoverrideTaskInitialize()
{
 Resolver.Log.Info("Initializing...");

//CreateSpiSensor();
CreateI2CSensor();

var consumer = Bmp280.CreateObserver(
handler: result =>
{
 Resolver.Log.Info($"Observer: Temp changed by threshold; new temp: {result.New.Temperature?.Celsius:N1}C, old: {result.Old?.Temperature?.Celsius:N1}C");
},
filter: result =>
{
if(result.Old?.Temperature is{} oldTemp &&
 result.New.Temperature is{} newTemp)
{
return(newTemp - oldTemp).Abs().Celsius >0.5;
}
returnfalse;
}
);
 sensor.Subscribe(consumer);

 sensor.Updated +=(sender, result)=>
{
try
{
 Resolver.Log.Info($" Temperature: {result.New.Temperature?.Celsius:N1}C");
 Resolver.Log.Info($" Pressure: {result.New.Pressure?.Millibar:N1}mbar ({result.New.Pressure?.Pascal:N1}Pa)");
}
catch(Exception ex)
{
 Resolver.Log.Error(ex,"Error reading sensor");
}
};

return Task.CompletedTask;
}

publicoverrideasyncTaskRun()
{
var conditions =await sensor.Read();
 Resolver.Log.Info("Initial Readings:");
 Resolver.Log.Info($" Temperature: {conditions.Temperature?.Celsius:N1}C");
 Resolver.Log.Info($" Pressure: {conditions.Pressure?.Bar:N1}hPa");

 sensor.StartUpdating(TimeSpan.FromSeconds(1));
}

voidCreateSpiSensor()
{
 Resolver.Log.Info("Create BME280 sensor with SPI...");

var spi = Device.CreateSpiBus();
 sensor =newBmp280(spi, Device.Pins.D00.CreateDigitalOutputPort());
}

voidCreateI2CSensor()
{
 Resolver.Log.Info("Create BME280 sensor with I2C...");

var i2c = Device.CreateI2cBus();
 sensor =newBmp280(i2c,(byte)Bmx280.Addresses.Default);// SDA pulled up

}

Sample project(s) available on GitHub

Wiring Example​

The BMP280 can be connected using I2C or SPI. Only 4 wires are required when using I2C:

  • 3.3V
  • Ground
  • SDA
  • SCL
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