private MCP3008SensorData ReadLightStatusInRoom()
{
var MCP3008SensorData = new MCP3008SensorData();
try
{
if (mcp3008 == null)
{
Debug.WriteLine("Light Sensor data is not ready");
MCP3008SensorData.lightStatus = "N/A";
return(MCP3008SensorData);
}
// The new light state, assume it's just right to start.
eState newState = eState.JustRight;
// Read from the ADC chip the current values of the two pots and the photo cell.
MCP3008SensorData.lowPotReadVal = mcp3008.ReadADC(LowPotentiometerADCChannel);
MCP3008SensorData.highPotReadVal = mcp3008.ReadADC(HighPotentiometerADCChannel);
MCP3008SensorData.cdsReadVal = mcp3008.ReadADC(CDSADCChannel);
// convert the ADC readings to voltages to make them more friendly.
MCP3008SensorData.lowPotVoltage = mcp3008.ADCToVoltage(MCP3008SensorData.lowPotReadVal);
MCP3008SensorData.highPotVoltage = mcp3008.ADCToVoltage(MCP3008SensorData.highPotReadVal);
MCP3008SensorData.cdsVoltage = mcp3008.ADCToVoltage(MCP3008SensorData.cdsReadVal);
// Let us know what was read in.
Debug.WriteLine(String.Format("Read values {0}, {1}, {2} ", MCP3008SensorData.lowPotReadVal,
MCP3008SensorData.highPotReadVal, MCP3008SensorData.cdsReadVal));
Debug.WriteLine(String.Format("Voltages {0}, {1}, {2} ", MCP3008SensorData.lowPotVoltage,
MCP3008SensorData.highPotVoltage, MCP3008SensorData.cdsVoltage));
// Compute the new state by first checking if the light level is too low
if (MCP3008SensorData.cdsVoltage < MCP3008SensorData.lowPotVoltage)
{
newState = eState.TooDark;
}
// And now check if it too high.
if (MCP3008SensorData.cdsVoltage > MCP3008SensorData.highPotVoltage)
{
newState = eState.TooBright;
}
// Use another method to determine what to do with the state.
MCP3008SensorData.lightStatus = CheckForStateValue(newState);
return(MCP3008SensorData);
}
catch (Exception)
{
MCP3008SensorData.lightStatus = "N/A";
return(MCP3008SensorData);
}
}
public async void Run(IBackgroundTaskInstance taskInstance)
{
// Using BackgroundTaskDeferral
// as described in http://aka.ms/backgroundtaskdeferral
BackgroundTaskDeferral deferral = taskInstance.GetDeferral();
bmpsensor = new BMP280();
await bmpsensor.Initialize();
mcp3008 = new MCP3008(ReferenceVoltage);
mcp3008.Initialize();
InitGPIO();
bmpSensorData = new BMP280SensorData();
adcSensorData = new MCP3008SensorData();
string roomstatus = String.Empty;
while (true)
{
Debug.WriteLine("Reading taken at " + DateTime.UtcNow);
#region Read pressure and temperature data from sensor
bmpSensorData.Temperature = await bmpsensor.ReadTemperature();
bmpSensorData.Pressure = await bmpsensor.ReadPreasure();
Debug.WriteLine(bmpSensorData.Temperature + " deg C");
Debug.WriteLine(bmpSensorData.Pressure + " Pa");
Debug.WriteLine(bmpSensorData.Pressure / 100000 + " Bar");
Debug.WriteLine(bmpSensorData.Pressure / 100 + " milliBar");
#endregion
#region Reading Lighting Information from Sensor
adcSensorData = ReadLightStatusInRoom();
Debug.WriteLine("Light Status in Room: " + adcSensorData.lightStatus);
#endregion
#region Read the motion sensor
// If sensor pin is high, then motion was detected
if (pir.Read() == GpioPinValue.High)
{
// turn on the LED
led.Write(GpioPinValue.Low);
Debug.WriteLine("Motion detected - Room is occupied");
roomstatus = "Occupied";
}
else
{
// turn off the LED
led.Write(GpioPinValue.High);
Debug.WriteLine("No motion detected - Room is vacant");
roomstatus = "Vacant";
}
#endregion
await SendDeviceToCloudMessageAsync(roomstatus, bmpSensorData, adcSensorData);
await Task.Delay(10000);
}
// Once the asynchronous method(s) are done, close the deferral.
// deferral.Complete();
}
private async Task SendDeviceToCloudMessageAsync(string status, BMP280SensorData BMP280SensorData, MCP3008SensorData MCP3008SensorData)
{
ConferenceRoomDataPoint conferenceRoomDataPoint = new ConferenceRoomDataPoint()
{
DeviceId = deviceName,
Time = DateTime.UtcNow.ToString("o"),
RoomTemp = BMP280SensorData.Temperature.ToString(),
RoomPressure = BMP280SensorData.Pressure.ToString(),
RoomAlt = BMP280SensorData.Altitude.ToString(),
LightStatus = MCP3008SensorData.lightStatus,
LightCDSValue = MCP3008SensorData.cdsReadVal.ToString(),
LightCDSVoltageValue = MCP3008SensorData.cdsVoltage.ToString(),
RoomStatus = status
};
if (status == "Occupied")
{
conferenceRoomDataPoint.Color = "Red";
}
else
{
conferenceRoomDataPoint.Color = "Green";
}
var jsonString = JsonConvert.SerializeObject(conferenceRoomDataPoint);
//var jsonStringInBytes = new Message(Encoding.ASCII.GetBytes(jsonString));
await AzureIoTHub.SendDeviceToCloudMessageAsync(jsonString);
Debug.WriteLine("{0} > Sending message: {1}", DateTime.UtcNow, jsonString);
}
