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Software/CSharp/Samples/Example-Relay/StartupTask.cs

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+// Relay Demonstration for the GrovePi.
+
+// This example combines the GrovePi and the Grove Relay using the Raspberry Pi and GrovePi.
+// http://www.dexterindustries.com/shop/grovepi-board/
+// http://www.dexterindustries.com/shop/grove-Relay/
+
+/*
+The MIT License(MIT)
+
+GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
+Copyright (C) 2016  Dexter Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+using System;
+using Windows.ApplicationModel.Background;
+using System.Threading.Tasks;
+
+// Add using statements to the GrovePi libraries
+using GrovePi;
+using GrovePi.Sensors;
+
+
+namespace Relay
+{
+    public sealed class StartupTask : IBackgroundTask
+    {
+        public void Run(IBackgroundTaskInstance taskInstance)
+        {
+            // Connect the Relay to Digital Pin 5
+            // Initialize the relay on Digital Pin 5 (D5)
+            IRelay relay = DeviceFactory.Build.Relay(Pin.DigitalPin5);
+            
+            // Loop endlessly
+            while (true)
+            {
+                try
+                {
+                    // Turn the Relay On.
+                    relay.ChangeState(SensorStatus.On);                     // Turn the relay on.
+                    System.Diagnostics.Debug.WriteLine("Button is On.");    // Write something to debug.
+                    Task.Delay(1000).Wait();                                // Delay 1 second
+
+                    // Turn the Relay Off.
+                    relay.ChangeState(SensorStatus.Off);                    // Turn the relay off.
+                    System.Diagnostics.Debug.WriteLine("Button is Off.");   // Write this fact to debug.
+                    Task.Delay(1000).Wait();                                // Delay 1 second     
+                }
+                catch (Exception ex)
+                {
+                    // NOTE: There are frequent exceptions of the following:
+                    // WinRT information: Unexpected number of bytes was transferred. Expected: '. Actual: '.
+                    // This appears to be caused by the rapid frequency of writes to the GPIO
+                    // These are being swallowed here/
+
+                    // If you want to see the exceptions uncomment the following:
+                    // System.Diagnostics.Debug.WriteLine(ex.ToString());
+                }
+            }
+        }
+    }
+}