protected override async void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
// ***
// *** Get a reference to the GPIO Controller.
// ***
GpioController controller = GpioController.GetDefault();
// ***
// *** Make sure the reference is valid (that e are connected to a device with
// *** a GPIO Controller.
// ***
if (controller != null)
{
// ***
// *** Set up the data pin.
// ***
GpioPin dataPin = GpioController.GetDefault().OpenPin(5, GpioSharingMode.Exclusive);
dataPin.SetDriveMode(GpioPinDriveMode.Input);
// ***
// *** Set up the trigger pin.
// ***
GpioPin triggerPin = GpioController.GetDefault().OpenPin(4, GpioSharingMode.Exclusive);
triggerPin.SetDriveMode(GpioPinDriveMode.Output);
// ***
// *** Create the sensor.
// ***
_sensor = new Dht22(dataPin, triggerPin);
await _sensor.Initialize();
}
// ***
// *** Start the timer.
// ***
_timer.Start();
}