first commit

Software/CSharp/GrovePi/Sensors/Sensor.cs

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+using System;
+
+namespace GrovePi.Sensors
+{
+    public abstract class Sensor<TSensorType> where TSensorType : class
+    {
+        protected readonly IGrovePi Device;
+        protected readonly Pin Pin;
+
+        internal Sensor(IGrovePi device, Pin pin, PinMode pinMode)
+        {
+            if (device == null) throw new ArgumentNullException(nameof(device));
+            Device = device;
+            Pin = pin;
+            device.PinMode(Pin, pinMode);
+        }
+
+        internal Sensor(IGrovePi device, Pin pin)
+        {
+            if (device == null) throw new ArgumentNullException(nameof(device));
+            Device = device;
+            Pin = pin;
+        }
+
+        public SensorStatus CurrentState => (SensorStatus) Device.DigitalRead(Pin);
+
+        public TSensorType ChangeState(SensorStatus newState)
+        {
+            Device.DigitalWrite(Pin, (byte) newState);
+            return this as TSensorType;
+        }
+
+        public void AnalogWrite(byte value)
+        {
+            Device.AnalogWrite(Pin,value);
+        }
+    }
+}