protected override void OnCharacteristicValueChanged(GattCharacteristic sender, GattValueChangedEventArgs eventArgs)
{
if (sender.Uuid == HumidityCharacteristicUuid)
{
if (_humidityValueChanged != null)
{
uint dataLength = eventArgs.CharacteristicValue.Length;
using (DataReader reader = DataReader.FromBuffer(eventArgs.CharacteristicValue))
{
if (dataLength == 4)
{
ushort temp = ReadBigEndianU16bit(reader);
ushort humidity = ReadBigEndianU16bit(reader);
var measurement = new HumidityMeasurement();
if (Version == 1)
{
// calculate temperature [deg C]
measurement.Temperature = -46.85 + (175.72 * (double)temp) / 65536.0;
humidity &= 0xFFFC; // clear bits [1..0] (status bits)
measurement.Humidity = -6.0 + (125.0 * (double)humidity) / 65536.0; // RH= -6 + 125 * SRH/2^16
}
else
{
measurement.Temperature = ((double)temp / 65536.0) * 165 - 40;
measurement.Humidity = ((double)humidity / 65536.0) * 100;
}
measurement.SetRawHumidity(humidity);
OnHumidityMeasurementValueChanged(new HumidityMeasurementEventArgs(measurement, eventArgs.Timestamp));
}
}
}
}
}
public HumidityMeasurementEventArgs(HumidityMeasurement measurement, DateTimeOffset timestamp)
{
Measurement = measurement;
Timestamp = timestamp;
}
