101 lines
4 KiB
C#
101 lines
4 KiB
C#
// Adjust LED brightness by rotating Potentiometer
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// GrovePi + Rotary Angle Sensor (Potentiometer) + LED
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// http://www.seeedstudio.com/wiki/Grove_-_Rotary_Angle_Sensor
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// http://www.seeedstudio.com/wiki/Grove_-_LED_Socket_Kit
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/*
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The MIT License(MIT)
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GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
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Copyright (C) 2017 Dexter Industries
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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using System;
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using Windows.ApplicationModel.Background;
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// Add using statements to the GrovePi libraries
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using GrovePi;
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using GrovePi.Sensors;
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namespace LedFade
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{
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public sealed class StartupTask : IBackgroundTask
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{
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public void Run(IBackgroundTaskInstance taskInstance)
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{
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// Connect the Rotary Angle Sensor to analog port 2
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IRotaryAngleSensor potentiometer = DeviceFactory.Build.RotaryAngleSensor(Pin.AnalogPin2);
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// Connect the LED to digital port 5
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ILed led = DeviceFactory.Build.Led(Pin.DigitalPin5);
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// Create a variable to track the LED brightness
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double brightness = 0;
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// Capture the current value from the Rotary Angle sensor
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double angle = 0;
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// Loop endlessly
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while (true)
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{
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try
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{
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// Capture the current value from the Rotary Angle sensor
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angle = potentiometer.SensorValue();
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// Output the agle to the Output Window
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System.Diagnostics.Debug.WriteLine("Angle is " + angle.ToString());
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// If the Rotary Angle sensor value is greater than zero...
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if (angle > 0)
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{
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// Divide the angle (a 10-bit value from 0-1023) by four
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// to get a single byte value value from 0-255.
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brightness = Math.Floor(angle / 4);
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}
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else
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{
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// If the angle is zero, set the brightness to zero
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brightness = 0;
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}
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// Output the brightness to the Output Window
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System.Diagnostics.Debug.WriteLine("Brightness is " + brightness.ToString());
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// AnalogWrite uses Pulse WIdth Modulation (PWM) to
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// control the brightness of the digital LED.
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led.AnalogWrite(Convert.ToByte(brightness));
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}
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catch (Exception ex)
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{
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// NOTE: There are frequent exceptions of the following:
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// WinRT information: Unexpected number of bytes was transferred. Expected: '. Actual: '.
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// This appears to be caused by the rapid frequency of writes to the GPIO
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// These are being swallowed here/
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// If you want to see the exceptions uncomment the following:
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// System.Diagnostics.Debug.WriteLine(ex.ToString());
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}
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}
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}
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}
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}
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