■ LM75A 디지털 온도 센서를 사용하는 방법을 보여준다.
▶ 부품 내역
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─────────────────────── 구분 모델 수량 비고 ───────── ────── ── ─── SENSOR/TEMPERATURE JMOD-TEMP-1 1 LM75A ─────────────────────── |
[회로 구성도]
▶ MainPage.xaml
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<Page x:Class="TestApplication.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="using:TestApplication" mc:Ignorable="d"> <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> <TextBlock x:Name="textBlock" HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" FontWeight="Bold" FontSize="48" /> </Grid> </Page> |
▶ MainPage.xaml.cs
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using System; using System.Diagnostics; using System.Threading; using Windows.Devices.Enumeration; using Windows.Devices.I2c; using Windows.Foundation; using Windows.UI.Core; using Windows.UI.Xaml.Controls; namespace TestApplication { /// <summary> /// 메인 페이지 /// </summary> public sealed partial class MainPage : Page { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// I2C 장치 /// </summary> private I2cDevice i2cDevice = null; /// <summary> /// 타이머 /// </summary> private Timer timer = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainPage() /// <summary> /// 생성자 /// </summary> public MainPage() { this.InitializeComponent(); InitializeI2CDevice(); Unloaded += Page_Unloaded; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 페이지 언로드시 처리하기 - Page_Unloaded(sender, e) /// <summary> /// 페이지 언로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Page_Unloaded(object sender, object e) { if(this.i2cDevice != null) { this.i2cDevice.Dispose(); } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 온도 계산하기 - CalculateTemperature(highValue, logValue) /// <summary> /// 온도 계산하기 /// </summary> /// <param name="highValue">상위 값</param> /// <param name="logValue">하위 값</param> /// <returns>온도</returns> private static double CalculateTemperature(int highValue, int logValue) { int value = (highValue << 3) + (logValue >> 5); if(value >= 1024) // 온도가 영하인 경우 { value -= 2048; } double temperature = value * 0.0625; return temperature; } #endregion #region 타이머 콜백 처리하기 - TimerCallback(state) /// <summary> /// 타이머 콜백 처리하기 /// </summary> /// <param name="state">상태</param> private void TimerCallback(object state) { string temperatureString; byte[] byteArray = new byte[2]; try { this.i2cDevice.Read(byteArray); } catch(Exception error) { Debug.WriteLine("예외 : " + error.Message); } int highValue = ((int)byteArray[0]); int lowValue = ((int)byteArray[1]); double temperature = CalculateTemperature(highValue, lowValue); Debug.WriteLine(temperature); temperatureString = string.Format("온도 : {0:F4} ℃", temperature); IAsyncAction task = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => { this.textBlock.Text = temperatureString; }); } #endregion #region I2C 장치 초기화 하기 - InitializeI2CDevice() /// <summary> /// I2C 장치 초기화 하기 /// </summary> private async void InitializeI2CDevice() { try { string advancedQuerySyntax = I2cDevice.GetDeviceSelector(); DeviceInformationCollection deviceInformationCollection = await DeviceInformation.FindAllAsync(advancedQuerySyntax); I2cConnectionSettings i2cConnectionSettings = new I2cConnectionSettings(0x48); i2cConnectionSettings.BusSpeed = I2cBusSpeed.FastMode; this.i2cDevice = await I2cDevice.FromIdAsync(deviceInformationCollection[0].Id, i2cConnectionSettings); } catch(Exception exception) { Debug.WriteLine("예외 : " + exception.Message); } this.timer = new Timer(TimerCallback, null, 0, 1000); } #endregion } } |
JMOD-TEMP-1 사용자설명서.docx
LM75A Data Sheet.pdf
TestApplication.zip