private long ReadUncompensatedPressure()
{
// write register address
bmp180.WriteBytes(new byte[] { 0xF4, (byte)(0x34 + (oversamplingSetting << 6)) });
// insert pressure waittime using oversampling setting as index.
Thread.Sleep(pressureWaitTime[oversamplingSetting]);
// get MSB and LSB result
byte[] data = new byte[3];
data = bmp180.ReadRegisters(0xF6, 3);
return(((data[0] << 16) | (data[1] << 8) | (data[2])) >> (8 - oversamplingSetting));
}
/// <summary>
/// Update the temperature and pressure from the sensor and set the Pressure property.
/// </summary>
public async Task Update()
{
//
// Tell the sensor to take a temperature and pressure reading, wait for
// 3ms (see section 2.2 of the datasheet) and then read the ADC values.
//
mpl115a2.WriteBytes(new byte[] { Registers.StartConversion, 0x00 });
await Task.Delay(5);
var data = mpl115a2.ReadRegisters(Registers.PressureMSB, 4);
//
// Extract the sensor data, note that this is a 10-bit reading so move
// the data right 6 bits (see section 3.1 of the datasheet).
//
var pressure = (ushort)(((data[0] << 8) + data[1]) >> 6);
var temperature = (ushort)(((data[2] << 8) + data[3]) >> 6);
Conditions.Temperature = (float)((temperature - 498.0) / -5.35) + 25;
//
// Now use the calculations in section 3.2 to determine the
// current pressure reading.
//
const double PRESSURE_CONSTANT = 65.0 / 1023.0;
var compensatedPressure = coefficients.A0 + ((coefficients.B1 + (coefficients.C12 * temperature))
* pressure) + (coefficients.B2 * temperature);
Conditions.Pressure = (float)(PRESSURE_CONSTANT * compensatedPressure) + 50;
}
/// <summary>
/// Update the Temperature property.
/// </summary>
public void Update()
{
lm75.WriteByte((byte)Register.LM_TEMP);
var data = lm75.ReadRegisters((byte)Register.LM_TEMP, 2);
// Details in Datasheet P10
double temp = 0;
ushort raw = (ushort)((data[0] << 3) | (data[1] >> 5));
if ((data[0] & 0x80) == 0)
{
// temperature >= 0
temp = raw * 0.125;
}
else
{
raw |= 0xF800;
raw = (ushort)(~raw + 1);
temp = raw * (-1) * 0.125;
}
//only accurate to +/- 0.1 degrees
Conditions.Temperature = (float)Math.Round(temp, 1);
}
protected async Task <AtmosphericConditions> ReadSensor()
{
AtmosphericConditions conditions = new AtmosphericConditions();
return(await Task.Run(() => {
si7021.WriteByte(HUMDITY_MEASURE_NOHOLD);
//
// 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]);
conditions.Humidity = ((125 * (float)humidityReading) / 65536) - 6;
if (conditions.Humidity < 0)
{
conditions.Humidity = 0;
}
else
{
if (conditions.Humidity > 100)
{
conditions.Humidity = 100;
}
}
data = si7021.ReadRegisters(TEMPERATURE_MEASURE_PREVIOUS, 2);
var temperatureReading = (short)((data[0] << 8) + data[1]);
conditions.Temperature = (float)(((175.72 * temperatureReading) / 65536) - 46.85);
return conditions;
}));
}
/// <summary>
/// Create a new TMP102 object using the default configuration for the sensor.
/// </summary>
/// <param name="address">I2C address of the sensor.</param>
public Tmp102(II2cBus i2cBus, byte address = 0x48)
{
tmp102 = new I2cPeripheral(i2cBus, address);
var configuration = tmp102.ReadRegisters(0x01, 2);
_sensorResolution = (configuration[1] & 0x10) > 0 ?
Resolution.Resolution13Bits : Resolution.Resolution12Bits;
}
/// <summary>
/// Force the sensor to make a reading and update the relevant properties.
/// </summary>
async Task Update()
{
int temp = 0;
//
// Get the humidity first.
//
groveTH02.WriteRegister(Registers.Config, StartMeasurement);
//
// Maximum conversion time should be 40ms but loop just in case
// it takes longer.
//
await Task.Delay(40);
while ((groveTH02.ReadRegister(Registers.Status) & 0x01) > 0)
{
;
}
byte[] data = groveTH02.ReadRegisters(Registers.DataHigh, 2);
temp = data[0] << 8;
temp |= data[1];
temp >>= 4;
Conditions.Humidity = (((float)temp) / 16) - 24;
//
// Now get the temperature.
//
groveTH02.WriteRegister(Registers.Config, StartMeasurement | MeasureTemperature);
//
// Maximum conversion time should be 40ms but loop just in case
// it takes longer.
//
await Task.Delay(40);
while ((groveTH02.ReadRegister(Registers.Status) & 0x01) > 0)
{
;
}
data = groveTH02.ReadRegisters(Registers.DataHigh, 2);
temp = data[0] << 8;
temp |= data[1];
temp >>= 2;
Conditions.Temperature = (((float)temp) / 32) - 50;
}
/// <summary>
/// Read the six sensor bytes and set the values for the X, Y and Z acceleration.
/// </summary>
/// <remarks>
/// All six acceleration registers should be read at the same time to ensure consistency
/// of the measurements.
/// </remarks>
public void Update()
{
var data = _adxl345.ReadRegisters(Registers.X0, 6);
X = (short)(data[0] + (data[1] << 8));
Y = (short)(data[2] + (data[3] << 8));
Z = (short)(data[4] + (data[5] << 8));
if ((_updateInterval != 0) &&
((Math.Abs(X - _lastX) > AccelerationChangeNotificationThreshold) ||
(Math.Abs(Y - _lastY) > AccelerationChangeNotificationThreshold) ||
(Math.Abs(Z - _lastZ) > AccelerationChangeNotificationThreshold)))
{
Vector lastNotifiedReading = new Vector(_lastX, _lastY, _lastZ);
Vector currentReading = new Vector(X, Y, Z);
_lastX = X;
_lastY = Y;
_lastZ = Z;
AccelerationChanged(this, new SensorVectorEventArgs(lastNotifiedReading, currentReading));
}
}
public double GetIlluminance()
{
var data = i2cPeripheral.ReadRegisters(0x03, 2);
int exponent = ((data[0] & 0xF0) >> 4);
int mantissa = ((data[0] & 0x0F) >> 4) | (data[1] & 0x0F);
var luminance = Math.Pow(2, exponent) * mantissa * 0.045;
return(luminance);
}
/// <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);
}
Conditions.Temperature = (float)(sensorReading * 0.0625);
}
/// <summary>
/// Create a new MPL115A2 temperature and humidity sensor object.
/// </summary>
/// <param name="address">Sensor address (default to 0x60).</param>
/// <param name="i2cBus">I2CBus (default to 100 KHz).</param>
public Mpl115a2(II2cBus i2cBus, byte address = 0x60)
{
var device = new I2cPeripheral(i2cBus, address);
mpl115a2 = device;
//
// Update the compensation data from the sensor. The location and format of the
// compensation data can be found on pages 5 and 6 of the datasheet.
//
var data = mpl115a2.ReadRegisters(Registers.A0MSB, 8);
var a0 = (short)(ushort)((data[0] << 8) | data[1]);
var b1 = (short)(ushort)((data[2] << 8) | data[3]);
var b2 = (short)(ushort)((data[4] << 8) | data[5]);
var c12 = (short)(ushort)(((data[6] << 8) | data[7]) >> 2);
//
// Convert the raw compensation coefficients from the sensor into the
// doubleing point equivalents to speed up the calculations when readings
// are made.
//
// Datasheet, section 3.1
// a0 is signed with 12 integer bits followed by 3 fractional bits so divide by 2^3 (8)
//
coefficients.A0 = (double)a0 / 8;
//
// b1 is 2 integer bits followed by 7 fractional bits. The lower bits are all 0
// so the format is:
// sign i1 I0 F12...F0
//
// So we need to divide by 2^13 (8192)
//
coefficients.B1 = (double)b1 / 8192;
//
// b2 is signed integer (1 bit) followed by 14 fractional bits so divide by 2^14 (16384).
//
coefficients.B2 = (double)b2 / 16384;
//
// c12 is signed with no integer bits but padded with 9 zeroes:
// sign 0.000 000 000 f12...f0
//
// So we need to divide by 2^22 (4,194,304) - 13 doubleing point bits
// plus 9 leading zeroes.
//
coefficients.C12 = (double)c12 / 4194304;
}
/// <summary>
/// Reads the current values of the magnetic field strength
/// </summary>
/// <returns>A <see cref="Vector"/> with the values of the magnetic field strenth on three axes, expressed in Gaus</returns>
public Vector Read()
{
// In case the sensor is in single measurement mode it is necessary to update the Mode Register, wait at least 6 ms and only then read the data.
if (Mode == OperatingMode.SingleMeasurement)
{
var currentModeRegisterData = (byte)OperatingMode.SingleMeasurement;
_device.WriteRegister(MR, currentModeRegisterData);
Thread.Sleep(7);
}
// Read raw sensor data and convert it to Gauss
var data = _device.ReadRegisters(DXRA, 6);
_currentX = ToGauss((short)((data[0] << 8) + data[1]));
_currentY = ToGauss((short)((data[2] << 8) + data[3]));
_currentZ = ToGauss((short)((data[4] << 8) + data[5]));
return(new Vector(_currentX, _currentY, _currentZ));
}
/// <summary>
/// Display the registers.
/// </summary>
public void DisplayRegisters()
{
var data = _ds323x.ReadRegisters(0, 0x12);
DebugInformation.DisplayRegisters(0, data);
}
protected int Read16(byte address)
{
var result = i2cPeripheral.ReadRegisters(address, 2);
return((result[0] << 8) | result[1]);
}
