/// <summary>
/// Get a reading from the sensor and set the Temperature and Humidity properties.
/// </summary>
public void Update()
{
var data = _sht31d.WriteRead(new byte[] { 0x2c, 0x06 }, 6);
Humidity = (100 * (float)((data[3] << 8) + data[4])) / 65535;
Temperature = ((175 * (float)((data[0] << 8) + data[1])) / 65535) - 45;
}
///<Summary>
/// Ritorna un oggetto Temperatura
///</Summary>
public Temperatura getTemp()
{
Temperatura t = new Temperatura();
byte[] RegisterNum = new byte[1] {
TEMPERATURE_REGISTER
};
byte[] RegisterValue = new byte[2];
i2cs.WriteRead(RegisterNum, RegisterValue);
Debug.Print("MSB: " + RegisterValue[0] + " LSB: " + RegisterValue[1]);
t.setMSB(RegisterValue[0]); //Primo Byte MSB1
t.setLSB(RegisterValue[1]); //Secondo Byte LSB
byte[] ResetValue = new byte[1] {
RESET_WORD
};
i2cs.Write(ResetValue);
return(t);
}
private const int TransactionTimeout = 1000; // ms
public bool Init(Mode mode = Mode.Bmp085_Mode_Standard)
{
if ((mode > Mode.Bmp085_Mode_Ultrahighres) || (mode < 0))
{
_mode = Mode.Bmp085_Mode_Standard;
}
else
{
_mode = mode;
}
byte[] whoami = { 0 };
_bus.WriteRead(_slaveConfig, new[] { (byte)Registers.Bmp085_Register_Chipid }, whoami, TransactionTimeout);
//I2CBus.GetInstance().ReadRegister(_slaveConfig, (byte)Registers.Bmp085_Register_Chipid, whoami, TransactionTimeout);
if (whoami[0] != 0x55)
{
return(false);
}
ReadCoefficients();
return(true);
}
public override void WriteRead(byte[] writeBuffer, int writeOffset, int writeLength, byte[] readBuffer, int readOffset, int readLength, out int numWritten, out int numRead)
{
daisyLinkBus.WriteRead(writeBuffer, writeOffset, writeLength, readBuffer, readOffset, readLength, out numWritten, out numRead);
}
/// <summary>
/// Create a new SI7021 temperature and humidity sensor.
/// </summary>
/// <param name="address">Sensor address (default to 0x40).</param>
/// <param name="speed">Speed of the I2C interface (default to 100 KHz).</param>
/// <param name="updateInterval">Number of milliseconds between samples (0 indicates polling to be used)</param>
/// <param name="humidityChangeNotificationThreshold">Changes in humidity greater than this value will trigger an event when updatePeriod > 0.</param>
/// <param name="temperatureChangeNotificationThreshold">Changes in temperature greater than this value will trigger an event when updatePeriod > 0.</param>
public SI7021(byte address = 0x40, ushort speed = 100, ushort updateInterval = MinimumPollingPeriod,
float humidityChangeNotificationThreshold = 0.001F, float temperatureChangeNotificationThreshold = 0.001F)
{
if (speed > 1000)
{
throw new ArgumentOutOfRangeException("Speed should be between 0 and 1000 KHz");
}
if (humidityChangeNotificationThreshold < 0)
{
throw new ArgumentOutOfRangeException("Humidity threshold should be >= 0");
}
if (temperatureChangeNotificationThreshold < 0)
{
throw new ArgumentOutOfRangeException("Temperature threshold should be >= 0");
}
if ((updateInterval != 0) && (updateInterval < MinimumPollingPeriod))
{
throw new ArgumentOutOfRangeException("Update period should be 0 or >= than " + MinimumPollingPeriod);
}
TemperatureChangeNotificationThreshold = temperatureChangeNotificationThreshold;
HumidityChangeNotificationThreshold = humidityChangeNotificationThreshold;
_updateInterval = updateInterval;
_si7021 = new I2CBus(address, speed);
//
// Get the device ID.
//
var part1 = _si7021.WriteRead(new[]
{
Registers.ReadIDFirstBytePart1,
Registers.ReadIDFirstBytePart2
}, 8);
var part2 = _si7021.WriteRead(new[]
{
Registers.ReadIDSecondBytePart1,
Registers.ReadIDSecondBytePart2
}, 6);
SerialNumber = 0;
for (var index = 0; index < 4; index++)
{
SerialNumber <<= 8;
SerialNumber += part1[index * 2];
}
SerialNumber <<= 8;
SerialNumber += part2[0];
SerialNumber <<= 8;
SerialNumber += part2[1];
SerialNumber <<= 8;
SerialNumber += part2[3];
SerialNumber <<= 8;
SerialNumber += part2[4];
if ((part2[0] == 0) || (part2[0] == 0xff))
{
SensorType = DeviceType.EngineeringSample;
}
else
{
SensorType = (DeviceType)part2[0];
}
//
// Update the firmware revision.
//
var firmware = _si7021.WriteRead(new[]
{
Registers.ReadFirmwareRevisionPart1,
Registers.ReadFirmwareRevisionPart2
}, 1);
FirmwareRevision = firmware[0];
if (updateInterval > 0)
{
StartUpdating();
}
else
{
Update();
}
}
