/// <summary>
/// Create a new TMP102 object using the default configuration for the sensor.
/// </summary>
/// <param name="address">I2C address of the sensor.</param>
/// <param name="speed">Speed of the communication with the sensor.</param>
public TMP102(byte address = 0x48, ushort speed = 100, ushort updateInterval = MinimumPollingPeriod,
float temperatureChangeNotificationThreshold = 0.001F)
{
if ((speed < 10) || (speed > 1000))
{
throw new ArgumentOutOfRangeException(nameof(speed), "Speed should be 10 KHz to 3,400 KHz.");
}
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);
}
TemperatureChangeNotificationThreshold = temperatureChangeNotificationThreshold;
_updateInterval = updateInterval;
_tmp102 = new I2cBus(address, speed);
var configuration = _tmp102.ReadRegisters(0x01, 2);
_sensorResolution = (configuration[1] & 0x10) > 0 ?
Resolution.Resolution13Bits : Resolution.Resolution12Bits;
if (updateInterval > 0)
{
StartUpdating();
}
else
{
Update();
}
}
/// <summary>
/// Make a temperature and humidity reading.
/// </summary>
public void Update()
{
_si7021.WriteByte(Registers.MeasureHumidityNoHold);
//
// Maximum conversion time is 12ms (page 5 of the datasheet).
//
Thread.Sleep(25);
var data = _si7021.ReadBytes(3);
var humidityReading = (ushort)((data[0] << 8) + data[1]);
Humidity = ((125 * (float)humidityReading) / 65536) - 6;
if (Humidity < 0)
{
Humidity = 0;
}
else
{
if (Humidity > 100)
{
Humidity = 100;
}
}
data = _si7021.ReadRegisters(Registers.ReadPreviousTemperatureMeasurement, 2);
var temperatureReading = (short)((data[0] << 8) + data[1]);
Temperature = (float)(((175.72 * temperatureReading) / 65536) - 46.85);
}
/// <summary>
/// Force the sensor to make a reading and update the relevanyt properties.
/// </summary>
public void Read()
{
var controlRegister = _mag3110.ReadRegister((byte)Registers.Control1);
controlRegister |= 0x02;
_mag3110.WriteRegister((byte)Registers.Control1, controlRegister);
var data = _mag3110.ReadRegisters((byte)Registers.XMSB, 6);
X = (short)((data[0] << 8) | data[1]);
Y = (short)((data[2] << 8) | data[3]);
Z = (short)((data[4] << 8) | data[5]);
}
/// <summary>
/// Update the Temperature property.
/// </summary>
public void Update()
{
var temperatureData = _tmp102.ReadRegisters(0x00, 2);
var sensorReading = 0;
if (SensorResolution == Resolution.Resolution12Bits)
{
sensorReading = (temperatureData[0] << 4) | (temperatureData[1] >> 4);
}
else
{
sensorReading = (temperatureData[0] << 5) | (temperatureData[1] >> 3);
}
Temperature = (float)(sensorReading * 0.0625);
}
