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Meadow.Foundation.Sensors.Environmental.Scd40

Scd40
StatusStatus badge: working
Source codeGitHub
Datasheet(s)GitHub
NuGet packageNuGet Gallery for Meadow.Foundation.Sensors.Environmental.Scd4x

Code Example

Scd40 sensor;

public override Task Initialize()
{
Resolver.Log.Info("Initializing...");

var i2cBus = Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard);

sensor = new Scd40(i2cBus);
var serialNum = sensor.GetSerialNumber();
Resolver.Log.Info($"Serial: {BitConverter.ToString(serialNum)}");

var consumer = Scd40.CreateObserver(
handler: result =>
{
Resolver.Log.Info($"Observer: Temp changed by threshold; new temp: {result.New.Temperature?.Celsius:N2}C, old: {result.Old?.Temperature?.Celsius:N2}C");
},
filter: result =>
{
if (result.Old?.Temperature is { } oldTemp &&
result.Old?.Humidity is { } oldHumidity &&
result.New.Temperature is { } newTemp &&
result.New.Humidity is { } newHumidity)
{
return ((newTemp - oldTemp).Abs().Celsius > 0.5 &&
(newHumidity - oldHumidity).Percent > 0.05);
}
return false;
}
);

sensor?.Subscribe(consumer);

if (sensor != null)
{
sensor.Updated += (sender, result) =>
{
Resolver.Log.Info($" Concentration: {result.New.Concentration?.PartsPerMillion:N0}ppm");
Resolver.Log.Info($" Temperature: {result.New.Temperature?.Celsius:N1}C");
Resolver.Log.Info($" Relative Humidity: {result.New.Humidity:N0}%");
};
}

sensor?.StartUpdating(TimeSpan.FromSeconds(6));

return base.Initialize();
}

Sample project(s) available on GitHub

Class Scd40

Represents an SCD40 C02 sensor

Assembly: Scd4x.dll
View Source
Declaration
public class Scd40 : Scd4xBase, IObservable<IChangeResult<(Concentration? Concentration, Temperature? Temperature, RelativeHumidity? Humidity)>>, ISamplingSensor<(Concentration? Concentration, Temperature? Temperature, RelativeHumidity? Humidity)>, ISensor<(Concentration? Concentration, Temperature? Temperature, RelativeHumidity? Humidity)>, ITemperatureSensor, ISamplingSensor<Temperature>, ISensor<Temperature>, IHumiditySensor, ISamplingSensor<RelativeHumidity>, ISensor<RelativeHumidity>, ICO2ConcentrationSensor, ISamplingSensor<Concentration>, ISensor<Concentration>, ISensor, ISamplingSensor, II2cPeripheral

Inheritance: System.Object -> Meadow.Foundation.ObservableBase<UNIT>

Implements:

Expand

System.IObservable<Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.RelativeHumidity>>>>, Meadow.Peripherals.Sensors.ISamplingSensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.RelativeHumidity>>>, Meadow.Peripherals.Sensors.ISensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.RelativeHumidity>>>, Meadow.Peripherals.Sensors.ITemperatureSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Temperature>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Temperature>, Meadow.Peripherals.Sensors.Atmospheric.IHumiditySensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.RelativeHumidity>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.RelativeHumidity>, Meadow.Peripherals.Sensors.Environmental.ICO2ConcentrationSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Concentration>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Concentration>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, Meadow.Hardware.II2cPeripheral

Implements

  • System.IObservable<Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.RelativeHumidity>>>>
  • Meadow.Peripherals.Sensors.ISamplingSensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.RelativeHumidity>>>
  • Meadow.Peripherals.Sensors.ISensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.RelativeHumidity>>>
  • Meadow.Peripherals.Sensors.ITemperatureSensor
  • Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Temperature>
  • Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Temperature>
  • Meadow.Peripherals.Sensors.Atmospheric.IHumiditySensor
  • Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.RelativeHumidity>
  • Meadow.Peripherals.Sensors.ISensor<Meadow.Units.RelativeHumidity>
  • Meadow.Peripherals.Sensors.Environmental.ICO2ConcentrationSensor
  • Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Concentration>
  • Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Concentration>
  • Meadow.Peripherals.Sensors.ISensor
  • Meadow.Peripherals.Sensors.ISamplingSensor
  • Meadow.Hardware.II2cPeripheral