public async void Run(IBackgroundTaskInstance taskInstance)
{
HTU21D sensor = new HTU21D();
bool result = await sensor.BeginAsync();
if (result)
{
float humidity = sensor.Humidity;
float temperature = sensor.Temperature;
float dewPoint = sensor.DewPoint;
System.Diagnostics.Debug.WriteLine("**************************************************");
System.Diagnostics.Debug.WriteLine("HTU21D Test Verification");
System.Diagnostics.Debug.WriteLine("**************************************************");
System.Diagnostics.Debug.WriteLine("HUMIDITY = [{0}]", humidity);
System.Diagnostics.Debug.WriteLine("TEMPERATURE = [{0}]", temperature);
System.Diagnostics.Debug.WriteLine("DEWPOINT = [{0}]", dewPoint);
if (temperature < 10 || humidity < 1)
{
System.Diagnostics.Debug.WriteLine(">>> Failed. Received bad values from sensor");
}
else
{
System.Diagnostics.Debug.WriteLine(">>> Passed.");
}
}
}
public async void Run(IBackgroundTaskInstance taskInstance)
{
HTU21D sensor = new HTU21D();
bool result = await sensor.BeginAsync();
if (result)
{
float humidity = sensor.Humidity;
float temperature = sensor.Temperature;
float dewPoint = sensor.DewPoint;
System.Diagnostics.Debug.WriteLine("**************************************************");
System.Diagnostics.Debug.WriteLine("HTU21D Test Verification");
System.Diagnostics.Debug.WriteLine("**************************************************");
System.Diagnostics.Debug.WriteLine("HUMIDITY = [{0}]", humidity);
System.Diagnostics.Debug.WriteLine("TEMPERATURE = [{0}]", temperature);
System.Diagnostics.Debug.WriteLine("DEWPOINT = [{0}]", dewPoint);
if (temperature < 10 || humidity < 1)
{
System.Diagnostics.Debug.WriteLine(">>> Failed. Received bad values from sensor");
}
else
{
System.Diagnostics.Debug.WriteLine(">>> Passed.");
}
}
}
/// <summary>
/// The run method
/// </summary>
public void RunSample()
{
HTU21D htu = new HTU21D("I2C1", /*For STM32F401RE Nucleo board, I2C1 bus is being configured in nanoFramework*/
0x40, /*The sensor slave address*/
I2cBusSpeed.StandardMode, /*We want to use the 100KHz speed to communicate with sensor*/
3 /*3 decimal places is enough for us while reading temperature and humidity changes*/);
/*
* NOTE: Limiting to the decimal places will not work when you do a "ToString" on floats.
* The limit to decimal places is only for comparison. For exmaple, if last measured temperature value
* was 25.3343567 and the next value is 25.3343667, then the difference between the two is about 0.00001.
* If we limit to 3 decimla places, then the values are read as 25.334 and 25.334, resulting in a difference
* of zero. This is used to compute if sensors changed or not...more the number of decimal places, higher
* is the change event possibility (because even a very small change will be registered)
*/
int loopCount = 3; //used later to limit test duration
/*********************************************************************************************************
* This driver supports, one-shot , single read mode, poll mode (meaning,you check the sensor for changes
* in temperature/humidity values) and event mode (meaning, the driver will alert you when
* temperature/humidity changes)
*********************************************************************************************************/
//One-Shot-mode example...
htu.Initialize(); //Initialize sensor
htu.PrepareToRead();
htu.Read();
Console.WriteLine("HTU21D Sensor reading in One-Shot-mode; T=" + htu.TemperatureInCelcius.ToString() + " C, RH%=" + htu.RelativeHumidity.ToString());
//Poll-mode example...
htu.Reset(); //reset to start from scratch
htu.Initialize();
htu.PrepareToRead();
while (loopCount > 0)
{
//This is how you can read the sensor on changes
if (htu.HasSensorValueChanged())
{
htu.Read();//Must not call read until "HasSensorValueChanged" method is called...
Console.WriteLine("HTU21D Sensor reading in Poll-mode; T=" + htu.TemperatureInCelcius.ToString() + " C, RH%=" + htu.RelativeHumidity.ToString());
}
loopCount--;//we want at-least 3-instances of change...be careful with "number of decimal places to register change
Thread.Sleep(3000);
}
loopCount = 3;
//Event mode....option 3
htu.Reset();
htu.Initialize();
if (htu.CanTrackChanges())
{
htu.SensorValueChanged += () => {
htu.Read();
Console.WriteLine("HTU21D Sensor reading in event-mode; T=" + htu.TemperatureInCelcius.ToString() + " C, RH%=" + htu.RelativeHumidity.ToString());
loopCount--;//we want at-least 3-instances of change...be careful with "number of decimal places to register change
};
htu.BeginTrackChanges(2000 /*track changes every 2 seconds*/);
while (loopCount > 0)
{
Thread.Sleep(3000);//Just a wait in the sample to end sample gracefully
loopCount--;
}
htu.EndTrackChanges();
}
htu.Dispose();
}
