private float Convert(Measurement.UnitsOfMeasure from, Measurement.UnitsOfMeasure to, float value)
{
float result = 0.0f;
if (from == to)
{
result = value;
}
else if (from == Measurement.UnitsOfMeasure.Celsius)
{
result = value * 9 / 5 + 32;
}
else
{
result = (value - 32) * 5 / 9;
}
return(result);
}
// takes an instant reading or returns the average accumulated value, and returns
// the interpreted value adjusted by calibration settings.
public async Task <Models.Measurement> GetTemperature()
{
Measurement result = _lastMeasurement;
try
{
if (_pin == null || _dht11 == null)
{
int pinNumber = TEMPERATUREDATAPIN; // default
if (CalibrationSettings.ContainsKey(TempGpioPinNumberSetting))
{
pinNumber = Int32.Parse(CalibrationSettings[TempGpioPinNumberSetting].ToString());
}
var c = GpioController.GetDefault();
if (c != null)
{
_pin = c.OpenPin(pinNumber, GpioSharingMode.Exclusive);
if (_pin != null)
{
_dht11 = new Dht11(_pin, GpioPinDriveMode.Input);
}
}
}
if (_dht11 == null)
{
return(null);
}
DhtReading reading = await _dht11.GetReadingAsync().AsTask();
for (int retries = 0; retries < 10; retries++)
{
if (reading.TimedOut)
{
Debug.Write(".");
}
else if (!reading.IsValid)
{
Debug.Write("x");
}
else
{
break;
}
}
if (reading.IsValid)
{
//Debug.WriteLine($"Temp reading = {reading.Temperature}");
Measurement.UnitsOfMeasure units = Measurement.UnitsOfMeasure.Fahrenheit;
if (CalibrationSettings.ContainsKey(PreferredTemperatureUnits))
{
units = (Measurement.UnitsOfMeasure)Enum.Parse(typeof(Measurement.UnitsOfMeasure), CalibrationSettings[PreferredTemperatureUnits].ToString());
}
Measurement adjust = new Measurement(0.0f, Measurement.UnitsOfMeasure.Fahrenheit);
if (CalibrationSettings.ContainsKey(AdjustTemperatureSetting))
{
adjust = CalibrationSettings[AdjustTemperatureSetting] as Measurement;
}
float temperature = (float)reading.Temperature;
temperature = Convert(Measurement.UnitsOfMeasure.Celsius, units, temperature);
adjust.Amount = Convert(adjust.Units, units, adjust.Amount);
adjust.Units = units;
temperature += adjust.Amount; // now that we know they are in the same (preferred) units
result = new Measurement(temperature, units);
_lastMeasurement = result;
OnTemperatureChanged(new MeasurementChangedEventArgs(result));
}
else
{
KegLogger.KegLogException(new TemperatureException("Custom: Unable to Read temperature."), "GetTemperature", SeverityLevel.Warning);
Debug.WriteLine($"Unable to read temperature.");
}
}
catch (Exception ex)
{
Debug.WriteLine("Error, " + ex.Message);
KegLogger.KegLogException(ex, "GetTemperature", SeverityLevel.Critical);
}
return(result);
}
