Class Ccs811

Provide access to the CCS811 C02 and VOC Air Quality Sensor

Assembly: Ccs811.dll

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public class Ccs811 : PollingSensorBase<(Concentration? Co2, Concentration? Voc)>, IObservable<IChangeResult<(Concentration? Co2, Concentration? Voc)>>, ISamplingSensor<(Concentration? Co2, Concentration? Voc)>, ISensor<(Concentration? Co2, Concentration? Voc)>, ICo2Sensor, IVocSensor, ISamplingSensor<Concentration>, ISensor<Concentration>, ISensor, ISamplingSensor, II2cPeripheral

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

Implements:

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System.IObservable<Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>>, Meadow.Peripherals.Sensors.ISamplingSensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>, Meadow.Peripherals.Sensors.ISensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>, Meadow.Peripherals.Sensors.Atmospheric.ICo2Sensor, Meadow.Peripherals.Sensors.Atmospheric.IVocSensor, 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

Properties

Co2

The measured CO2 concentration

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public Concentration? Co2 { get; }

Voc

The measured VOC concentration

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public Concentration? Voc { get; }

DefaultI2cAddress

The default I2C address for the peripheral

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public byte DefaultI2cAddress { get; }

Methods

Initialize()

Initialize the sensor

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protected void Initialize()

Exceptions

System.Exception
Raised if HW_ID register returns an invalid id

GetBaseline()

Get baseline value

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public ushort GetBaseline()

Returns

System.UInt16: The baseline value### SetBaseline(ushort) Set the baseline value

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public void SetBaseline(ushort value)

Parameters

Type	Name	Description
System.UInt16	value	The new baseline

GetMeasurementMode()

Get the current measurement mode

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public Ccs811.MeasurementMode GetMeasurementMode()

Returns

Meadow.Foundation.Sensors.Atmospheric.Ccs811.MeasurementMode: The measurement mode### SetMeasurementMode(MeasurementMode) Set the Measurement mode

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public void SetMeasurementMode(Ccs811.MeasurementMode mode)

Parameters

Type	Name	Description
Meadow.Foundation.Sensors.Atmospheric.Ccs811.MeasurementMode	mode	The new mode

ReadSensor()

Reads data from the sensor

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protected override Task<(Concentration? Co2, Concentration? Voc)> ReadSensor()

Returns

System.Threading.Tasks.Task<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>: The latest sensor reading### RaiseEventsAndNotify(IChangeResult<(Concentration? Co2, Concentration? Voc)>) Raise events for subscribers and notify of value changes

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protected override void RaiseEventsAndNotify(IChangeResult<(Concentration? Co2, Concentration? Voc)> changeResult)

Parameters

Type	Name	Description
Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>	changeResult	The updated sensor data

Events

VocUpdated

Event raised when the VOC concentration value changes

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public event EventHandler<ChangeResult<Concentration>> VocUpdated

Event Type

System.EventHandler<Meadow.ChangeResult<Meadow.Units.Concentration>>

Implements

• System.IObservable<Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>>
• Meadow.Peripherals.Sensors.ISamplingSensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>
• Meadow.Peripherals.Sensors.ISensor<System.ValueTuple<System.Nullable<Meadow.Units.Concentration>,System.Nullable<Meadow.Units.Concentration>>>
• Meadow.Peripherals.Sensors.Atmospheric.ICo2Sensor
• Meadow.Peripherals.Sensors.Atmospheric.IVocSensor
• 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