Gadgeteer Driver for GHI TempHumidity module, ported to run on Raspberry Pi 2 under Windows 10 IoT Core

TempHumid.cs

/*
* Driver for Seeed Studios Temperature and Humidity Gadgeteer module
* also should work for GHI TempHumidity module (discontinued).
* Driver code is based on the GHI TempHumid module driver found at:
* https://bitbucket.org/ghi_elect/gadgeteer/src/88bd3ab6f5ed02c3e1c524780182ea4f6901d091/Modules/GHIElectronics/TempHumidity/TempHumidity_43/TempHumidity_43.cs
*
* Module uses SHT10 sensor. Datasheet can be found at:
* https://www.sparkfun.com/datasheets/Sensors/SHT1x_datasheet.pdf
*
* Please note that to use this driver with Windows 10 IoT Core on
* Raspberry Pi 2, you need to install the GHI Gadgeteer package for UWP
* which can be found using the Nuget Package Manager.
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using GHIElectronics.UWP.GadgeteerCore;

using GSI = GHIElectronics.UWP.GadgeteerCore.SocketInterfaces;

namespace PiTempHumid
{
    public class TempHumid : Module
    {
        private GSI.DigitalIO data;
        private GSI.DigitalIO sck;

        public override string Name => "TempHumid";
        public override string Manufacturer => "GHI Electronics, LLC";

        public TempHumid()
        {
            
        }

        protected override async Task Initialize(ISocket parentSocket)
        {
            this.data = await parentSocket.CreateDigitalIOAsync(SocketPinNumber.Three, true);
            this.sck = await parentSocket.CreateDigitalIOAsync(SocketPinNumber.Four, false);

            await Task.Delay(TimeSpan.FromMilliseconds(11));

            this.ResetCommuncation();
        }

        public Measurement TakeMeasurement()
        {
            return TakeMeasurement(1.0, 1.0);
        }

        public Measurement TakeMeasurement(double humidityCalibrationFactor, double tempCalibrationFactor)
        {
            this.ResetCommuncation();

            this.TransmissionStart();

            int tempTemp = this.MeasureTemperature();
            double temperature = -39.6 + 0.01 * tempTemp;
            temperature = temperature * tempCalibrationFactor;

            this.TransmissionStart();

            int rawHumidity = this.MeasureHumidity();
            double humidity = -2.0468 + 0.0367 * rawHumidity - 1.5955E-6 * rawHumidity * rawHumidity;
            humidity = (temperature - 25) * (0.01 + 0.00008 * rawHumidity) + humidity;
            humidity = humidity * humidityCalibrationFactor;

            temperature = Math.Round(100.0 * temperature) / 100.0;
            humidity = Math.Round(100.0 * humidity) / 100.0;

            return new Measurement() { Temperature = temperature, RelativeHumidity = humidity };
        }

        private void TransmissionStart()
        {
            this.data.Write(true);
            this.sck.Write(true);
            this.data.Write(false);
            this.sck.Write(false);
            this.sck.Write(true);
            this.data.Write(true);
            this.sck.Write(false);
        }

        private int MeasureTemperature()
        {
            this.data.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.data.Write(true);

            this.sck.Write(true);
            this.sck.Write(false);

            this.data.Write(false);

            this.data.Write(true);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);

            this.data.Read();

            this.sck.Write(false);

            while(this.data.Read())
                Task.Delay(1).Wait();

            int reading = 0;

            for (int i = 0; i < 8; i++)
            {
                reading |= this.data.Read() ? (1 << (15 - i)) : 0;
                this.sck.Write(true);
                this.sck.Write(false);
            }

            this.data.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            for (int i = 8; i < 16; i++)
            {
                reading |= this.data.Read() ? (1 << (15 - i)) : 0;
                this.sck.Write(true);
                this.sck.Write(false);
            }

            this.data.Write(true);

            return reading;
        }

        private int MeasureHumidity()
        {
            this.data.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.data.Write(true);

            this.sck.Write(true);
            this.sck.Write(false);

            this.data.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            this.data.Write(true);

            this.sck.Write(true);
            this.sck.Write(false);

            this.sck.Write(true);

            this.data.Read();

            this.sck.Write(false);

            while (this.data.Read())
                Task.Delay(1).Wait();

            int reading = 0;
            for (int i = 0; i < 8; i++)
            {
                reading |= this.data.Read() ? (1 << (15 - i)) : 0;
                this.sck.Write(true);
                this.sck.Write(false);
            }

            this.data.Write(false);

            this.sck.Write(true);
            this.sck.Write(false);

            for (int i = 8; i < 16; i++)
            {
                reading |= this.data.Read() ? (1 << (15 - i)) : 0;
                this.sck.Write(true);
                this.sck.Write(false);
            }

            this.data.Write(true);

            return reading;
        }

        private void ResetCommuncation()
        {
            this.data.Write(true);

            for (int i = 0; i < 9; i++)
            {
                this.sck.Write(true);
                this.sck.Write(false);
            }
        }

        public struct Measurement
        {
            public double TemperatureFahrenheit { get { return this.Temperature * 1.8 + 32.0; } }
            public double Temperature { get; set; }
            public double RelativeHumidity { get; set; }

            public override string ToString()
            {
                return this.Temperature.ToString("F1") + " degrees Celsius, " + this.RelativeHumidity.ToString("F1") + "% relative humidity.";
            }
        }
    }
}