/// <summary>
/// New instance of the AnalogTemperatureSensor class.
/// </summary>
/// <param name="analogPin">Analog pin the temperature sensor is connected to.</param>
/// <param name="sensorType">Type of sensor attached to the analog port.</param>
/// <param name="calibration">Calibration for the analog temperature sensor.</param>
/// <param name="updateInterval">Number of milliseconds between samples (0 indicates polling to be used)</param>
/// <param name="temperatureChangeNotificationThreshold">Changes in temperature greater than this value will trigger an event when updatePeriod > 0.</param>
public AnalogTemperature(Cpu.AnalogChannel analogPin, KnownSensorType sensorType, Calibration calibration = null,
ushort updateInterval = MinimumPollingPeriod, float temperatureChangeNotificationThreshold = 0.001F)
{
if (temperatureChangeNotificationThreshold < 0)
{
throw new ArgumentOutOfRangeException(nameof(temperatureChangeNotificationThreshold),
"Temperature threshold should be >= 0");
}
if ((updateInterval != 0) && (updateInterval < MinimumPollingPeriod))
{
throw new ArgumentOutOfRangeException(nameof(updateInterval),
"Update period should be 0 or >= than " + MinimumPollingPeriod);
}
//
// If the calibration object is null use the defaults for TMP35.
//
if (calibration == null)
{
calibration = new Calibration();
}
TemperatureChangeNotificationThreshold = temperatureChangeNotificationThreshold;
_updateInterval = updateInterval;
AnalogPort = new AnalogInput(analogPin);
switch (sensorType)
{
case KnownSensorType.TMP35:
case KnownSensorType.LM35:
case KnownSensorType.LM45:
_yIntercept = 0;
_millivoltsPerDegreeCentigrade = 10;
break;
case KnownSensorType.LM50:
case KnownSensorType.TMP36:
_yIntercept = 500;
_millivoltsPerDegreeCentigrade = 10;
break;
case KnownSensorType.TMP37:
_yIntercept = 0;
_millivoltsPerDegreeCentigrade = 20;
break;
case KnownSensorType.Custom:
_yIntercept = calibration.MillivoltsAtSampleReading - (calibration.SampleReading * calibration.MillivoltsAtSampleReading);
_millivoltsPerDegreeCentigrade = calibration.MillivoltsPerDegreeCentigrade;
break;
default:
throw new ArgumentException("Unknown sensor type", nameof(sensorType));
#pragma warning disable 0162
break;
#pragma warning restore 0162
}
if (updateInterval > 0)
{
StartUpdating();
}
else
{
Update();
}
}
public AnalogTemperature(IAnalogInputPort analogInputPort,
KnownSensorType sensorType,
Calibration calibration = null)
{
AnalogInputPort = analogInputPort;
//
// If the calibration object is null use the defaults for TMP35.
//
if (calibration == null)
{
calibration = new Calibration();
}
switch (sensorType)
{
case KnownSensorType.TMP35:
case KnownSensorType.LM35:
case KnownSensorType.LM45:
_yIntercept = 0;
_millivoltsPerDegreeCentigrade = 10;
break;
case KnownSensorType.LM50:
case KnownSensorType.TMP36:
_yIntercept = 500;
_millivoltsPerDegreeCentigrade = 10;
break;
case KnownSensorType.TMP37:
_yIntercept = 0;
_millivoltsPerDegreeCentigrade = 20;
break;
case KnownSensorType.Custom:
_yIntercept = calibration.MillivoltsAtSampleReading - (calibration.SampleReading * calibration.MillivoltsPerDegreeCentigrade);
_millivoltsPerDegreeCentigrade = calibration.MillivoltsPerDegreeCentigrade;
break;
default:
throw new ArgumentException("Unknown sensor type", nameof(sensorType));
}
// wire up our observable
// have to convert from voltage to temp units for our consumers
// this is where the magic is: this allows us to extend the IObservable
// pattern through the sensor driver
AnalogInputPort.Subscribe
(
new FilterableObserver <FloatChangeResult, float>(
h => {
var newTemp = VoltageToTemperature(h.New);
var oldTemp = VoltageToTemperature(h.Old);
Temperature = newTemp; // save state
RaiseEventsAndNotify
(
new AtmosphericConditionChangeResult(
new AtmosphericConditions(newTemp, null, null),
new AtmosphericConditions(oldTemp, null, null)
)
);
}
)
);
}
public AnalogTemperature(IAnalogInputPort analogInputPort,
KnownSensorType sensorType,
Calibration calibration = null)
{
AnalogInputPort = analogInputPort;
switch (sensorType)
{
case KnownSensorType.TMP35:
case KnownSensorType.LM35:
case KnownSensorType.LM45:
calibration = new Calibration(
degreesCelciusSampleReading: 25,
millivoltsAtSampleReading: 250,
millivoltsPerDegreeCentigrade: 10);
break;
case KnownSensorType.LM50:
case KnownSensorType.TMP36:
calibration = new Calibration(
degreesCelciusSampleReading: 25,
millivoltsAtSampleReading: 750,
millivoltsPerDegreeCentigrade: 10);
break;
case KnownSensorType.TMP37:
calibration = new Calibration(
degreesCelciusSampleReading: 25,
millivoltsAtSampleReading: 750,
millivoltsPerDegreeCentigrade: 10);
break;
case KnownSensorType.Custom:
//user provided calibration
break;
default:
calibration = new Calibration();
break;
}
SensorCalibration = calibration;
// wire up our observable
// have to convert from voltage to temp units for our consumers
// this is where the magic is: this allows us to extend the IObservable
// pattern through the sensor driver
AnalogInputPort.Subscribe
(
new FilterableChangeObserver <FloatChangeResult, float>(
h => {
var newTemp = VoltageToTemperature(h.New);
var oldTemp = VoltageToTemperature(h.Old);
Temperature = newTemp; // save state
RaiseEventsAndNotify
(
new AtmosphericConditionChangeResult(
new AtmosphericConditions(newTemp, null, null),
new AtmosphericConditions(oldTemp, null, null)
)
);
}
)
);
}
