Class Emc2101

Represents an EMC2101 fan controller and temperature monitor

Assembly: Emc2101.dll

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public class Emc2101 : PollingSensorBase<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)>, IObservable<IChangeResult<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)>>, ISamplingSensor<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)>, ISensor<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)>, ISensor, ISamplingSensor, II2cPeripheral

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

Implements:
System.IObservable<Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>>, Meadow.Peripherals.Sensors.ISamplingSensor<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>, Meadow.Peripherals.Sensors.ISensor<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, Meadow.Hardware.II2cPeripheral

Properties

ExternalTemperature

The temperature as read by the external sensor

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public Temperature? ExternalTemperature { get; }

InternalTemperature

The temperature as read by the internal sensor

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public Temperature? InternalTemperature { get; }

FanSpeed

The current fan speed

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public AngularVelocity? FanSpeed { get; }

DefaultI2cAddress

The default I2C address for the peripheral

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public byte DefaultI2cAddress { get; }

MinimumFanSpeed

Get/Set the minimum fan speed for the currently connected fan

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public AngularVelocity MinimumFanSpeed { get; set; }

PwmFrequencyScaler

Scales the PWM frequency against the current fan settings Recommended to leave at max value of 0x1F The is a 5 bit value

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public byte PwmFrequencyScaler { get; set; }

PwmDivisor

The alternate PWM divide value that can be used instead of CLK_SEL bit function This can set anytime but will only be used if the clock override bit is enabled

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public byte PwmDivisor { get; set; }

FanPwmDutyCycle

Get/Set the current manually set fan PWM duty cycle (0 - 1.0)

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public float FanPwmDutyCycle { get; set; }

Hysteresis

Get / set the amount of hysteresis applied to the temperature readings used in the fan speed lookup table

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public Temperature Hysteresis { get; set; }

SensorDataRate

The temperature sensor data rate

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public Emc2101.DataRate SensorDataRate { get; set; }

DACOutputEnabled

Enable or disable outputting the fan control signal as a DC voltage

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public bool DACOutputEnabled { get; set; }

Fields

i2cComms

I2C Communication bus used to communicate with the peripheral

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protected readonly II2cCommunications i2cComms

Methods

RaiseEventsAndNotify(IChangeResult<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)>)

Raise changed events for subscribers

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protected override void RaiseEventsAndNotify(IChangeResult<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)> changeResult)

Parameters

Type	Name	Description
Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>	changeResult	The new sensor values

ReadSensor()

Reads data from the sensor

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protected override Task<(Temperature? InternalTemperature, Temperature? ExternalTemperature, AngularVelocity? FanSpeed)> ReadSensor()

Returns

System.Threading.Tasks.Task<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>: The latest sensor reading### EnableTachInput(bool) Enable the TACH/ALERT pin as an input to read the fan speed (for 4 wire fans)

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public void EnableTachInput(bool enable)

Parameters

Type	Name	Description
System.Boolean	enable	true to enable, false to disable

InvertFanSpeed(bool)

Invert the sensor's reading of fan speed

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public void InvertFanSpeed(bool invert)

Parameters

Type	Name	Description
System.Boolean	invert	true to invert, false for normal

ConfigurePwmClock(bool, bool)

Configure the PWM clock

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public void ConfigurePwmClock(bool clockSelect, bool clockOverride)

Parameters

Type	Name	Description
System.Boolean	clockSelect	true to use a 1.4kHz base PWM clock, false to use the default 360kHz PWM clock
System.Boolean	clockOverride	true to override the base clock and use the frequency divisor to set the PWM frequency

ConfigureFanSpinup(FanSpinupDrive, FanSpinupTime)

Configure the fan spinup behavior

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public void ConfigureFanSpinup(Emc2101.FanSpinupDrive spinupDrive, Emc2101.FanSpinupTime spinupTime)

Parameters

Type	Name	Description
Meadow.Foundation.ICs.FanControllers.Emc2101.FanSpinupDrive	spinupDrive	The drive or percent to spin up to
Meadow.Foundation.ICs.FanControllers.Emc2101.FanSpinupTime	spinupTime	The time taken to spin up to the drive speed

SetLookupTable(LutIndex, Temperature, float)

Set a temperature and fan duty cycle to the lookup table

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public void SetLookupTable(Emc2101.LutIndex index, Temperature temperatureThreshhold, float pwmDutyCycle)

Parameters

Type	Name	Description
Meadow.Foundation.ICs.FanControllers.Emc2101.LutIndex	index	The LUT index to set
Meadow.Units.Temperature	temperatureThreshhold	the temperature threshold
System.Single	pwmDutyCycle	the fan PWM duty cycle

Events

InternalTemperatureUpdated

Internal Temperature changed event

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public event EventHandler<IChangeResult<Temperature>> InternalTemperatureUpdated

Event Type

System.EventHandler<Meadow.IChangeResult<Meadow.Units.Temperature>>

ExternalTemperatureUpdated

External Temperature changed event

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public event EventHandler<IChangeResult<Temperature>> ExternalTemperatureUpdated

Event Type

System.EventHandler<Meadow.IChangeResult<Meadow.Units.Temperature>>

FanSpeedUpdated

Fan Speed changed event

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public event EventHandler<IChangeResult<AngularVelocity>> FanSpeedUpdated

Event Type

System.EventHandler<Meadow.IChangeResult<Meadow.Units.AngularVelocity>>

Implements

• System.IObservable<Meadow.IChangeResult<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>>
• Meadow.Peripherals.Sensors.ISamplingSensor<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>
• Meadow.Peripherals.Sensors.ISensor<System.ValueTuple<System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.Temperature>,System.Nullable<Meadow.Units.AngularVelocity>>>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor
• Meadow.Hardware.II2cPeripheral