public async Task <DHT11ReadResult> Read()
{
pin.PinMode = GpioPinDriveMode.Output;
await pin.WriteAsync(GpioPinValue.High);
await Task.Delay(TimeSpan.FromMilliseconds(25));
await pin.WriteAsync(GpioPinValue.Low);
await Task.Delay(TimeSpan.FromMilliseconds(11));
pin.PinMode = GpioPinDriveMode.Input;
pin.InputPullMode = GpioPinResistorPullMode.PullUp;
var data = CollectInput();
var pullUpLengths = ParseDataPullUpLengths(data);
if (pullUpLengths.Length != 40)
{
return(new DHT11ReadResult
{
Error = DHT11ReadErrorState.MissingData,
});
}
var bits = CalculateBits(pullUpLengths);
var result = BitsToBytes(bits);
var checksum = CalculateChecksum(result);
if (result[4] != checksum)
{
return(new DHT11ReadResult
{
Error = DHT11ReadErrorState.CRC
});
}
return(new DHT11ReadResult
{
Temperature = result[2],
Humidity = result[0],
Error = DHT11ReadErrorState.None
});
}
public async Task TurnOnAsync()
{
await _pin.WriteAsync(true);
}