■ BME280 디지털 온도/기압/습도 센서를 사용하는 방법을 보여준다.
▶ 부품 내역
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─────────────────── 구분 모델 수량 비고 ───────── ─── ── ── SENSOR/TEMPERATURE BME280 1 ─────────────────── |
[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:local="using:TestApplication" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Page.Resources> <Style TargetType="TextBlock"> <Setter Property="Margin" Value="5" /> </Style> </Page.Resources> <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> <Grid HorizontalAlignment="Center" VerticalAlignment="Center"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <TextBlock Grid.Column="0" Grid.Row="0" Text="온도 :" /> <TextBlock Name="temperatureTextBlock" Grid.Column="1" Grid.Row="0" /> <TextBlock Grid.Column="0" Grid.Row="1" Text="기압 :" /> <TextBlock Name="pressureTextBlock" Grid.Column="1" Grid.Row="1" /> <TextBlock Grid.Column="0" Grid.Row="2" Text="습도 :" /> <TextBlock Name="humidityTextBlock" Grid.Column="1" Grid.Row="2" /> </Grid> </Grid> </Page> |
▶ MainPage.xaml.cs
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using System; using System.Threading.Tasks; using Windows.Devices.Enumeration; using Windows.Devices.I2c; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; namespace TestApplication { /// <summary> /// 메인 페이지 /// </summary> public sealed partial class MainPage : Page { //////////////////////////////////////////////////////////////////////////////////////////////////// Enumeration ////////////////////////////////////////////////////////////////////////////////////////// Private #region 보정 레지스터 주소 - CalibrationRegisterAddress /// <summary> /// 보정 레지스터 주소 /// </summary> private enum CalibrationRegisterAddress : byte { DIGITAL_T1 = 0x88, DIGITAL_T2 = 0x8a, DIGITAL_T3 = 0x8c, DIGITAL_P1 = 0x8e, DIGITAL_P2 = 0x90, DIGITAL_P3 = 0x92, DIGITAL_P4 = 0x94, DIGITAL_P5 = 0x96, DIGITAL_P6 = 0x98, DIGITAL_P7 = 0x9a, DIGITAL_P8 = 0x9c, DIGITAL_P9 = 0x9e, DIGITAL_H1 = 0xa1, DIGITAL_H2 = 0xe1, DIGITAL_H3 = 0xe3, DIGITAL_H4 = 0xe4, DIGITAL_H5 = 0xe5, DIGITAL_H6 = 0xe7, } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// I2C 장치 /// </summary> private I2cDevice i2cDevice; /// <summary> /// BME280 주소 /// </summary> private byte ADDRESS_BME280 = 0x76; #region BME280 보정 데이터 값 private UInt16 T1; private Int16 T2; private Int16 T3; private UInt16 P1; private Int16 P2; private Int16 P3; private Int16 P4; private Int16 P5; private Int16 P6; private Int16 P7; private Int16 P8; private Int16 P9; private byte H1; private Int16 H2; private byte H3; private Int16 H4; private Int16 H5; private Int16 H6; #endregion #region BME280 레지스터 주소 private const byte TEMP_MSB_REGISTER_ADDRESS = 0xfa; private const byte TEMP_LSB_REGISTER_ADDRESS = 0xfb; private const byte TEMP_XLSB_REGISTER_ADDRESS = 0xfc; private const byte PRESS_MSB_REGISTER_ADDRESS = 0xf7; private const byte PRESS_LSB_REGISTER_ADDRESS = 0xf8; private const byte PRESS_XLSB_REGISTER_ADDRESS = 0xf9; private const byte HUM_MSB_REGISTER_ADDRESS = 0xfd; private const byte HUM_LSB_REGISTER_ADDRESS = 0xfe; #endregion /// <summary> /// BME280 데이터 교정용 /// </summary> private Int32 fineTunning = Int32.MinValue; /// <summary> /// 타이머 /// </summary> private DispatcherTimer timer; /// <summary> /// 온도 /// </summary> private double temperature; /// <summary> /// 기압 /// </summary> private double pressure; /// <summary> /// 습도 /// </summary> private double humidity; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainPage() /// <summary> /// 생성자 /// </summary> public MainPage() { this.InitializeComponent(); InitializeDevice(); this.timer = new DispatcherTimer(); this.timer.Interval = TimeSpan.FromSeconds(10); this.timer.Tick += timer_Tick; this.timer.Start(); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 타이머 틱 처리하기 - timer_Tick(sender, e) /// <summary> /// 타이머 틱 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private async void timer_Tick(object sender, object e) { this.temperature = await ReadTemperatureData(); this.pressure = await ReadPressureData(); this.humidity = await ReadHumidityData(); this.temperatureTextBlock.Text = this.temperature.ToString("F1"); this.humidityTextBlock.Text = this.humidity.ToString("F1"); this.pressureTextBlock.Text = this.pressure.ToString("F1"); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 센서 구성하기 - ConfigureSensor() /// <summary> /// 센서 구성하기 /// </summary> private async Task ConfigureSensor() { uint osrs_t = 3; uint osrs_p = 3; uint osrs_h = 3; uint mode = 3; uint t_sb = 5; uint filter = 0; uint spi3w_en = 0; uint ctrl_hum = osrs_h; uint ctrl_meas = (osrs_t << 5) | (osrs_p << 2) | mode; uint config = (t_sb << 5) | (filter << 2) | spi3w_en; this.i2cDevice.Write(new byte[] { 0xf2, (byte)ctrl_hum }); this.i2cDevice.Write(new byte[] { 0xf4, (byte)ctrl_meas }); this.i2cDevice.Write(new byte[] { 0xf5, (byte)config }); await Task.Delay(10); } #endregion #region 바이트 데이터 읽기 - ReadByteData(register) /// <summary> /// 바이트 데이터 읽기 /// </summary> /// <param name="register">레지스터</param> /// <returns>바이트 데이터</returns> private byte ReadByteData(byte register) { byte[] writeByteArray = new byte[] { 0x00 }; byte[] readByteArray = new byte[] { 0x00 }; writeByteArray[0] = register; this.i2cDevice.WriteRead(writeByteArray, readByteArray); return readByteArray[0]; } #endregion #region UINT16 데이터 읽기 - ReadUInt16Data(register) /// <summary> /// UINT16 데이터 읽기 /// </summary> /// <param name="register">레지스터</param> /// <returns>UINT16 데이터</returns> private UInt16 ReadUInt16Data(byte register) { byte[] writeByteArray = new byte[] { 0x00 }; byte[] readByteArray = new byte[] { 0x00, 0x00 }; writeByteArray[0] = register; this.i2cDevice.WriteRead(writeByteArray, readByteArray); int highValue = readByteArray[1] << 8; int lowValue = readByteArray[0]; return (UInt16)(highValue + lowValue); } #endregion #region 보정 데이터 설정하기 - SetCalibrationData() /// <summary> /// 보정 데이터 설정하기 /// </summary> private void SetCalibrationData() { // 온도 this.T1 = ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_T1); this.T2 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_T2); this.T3 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_T3); // 기압 this.P1 = ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P1); this.P2 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P2); this.P3 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P3); this.P4 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P4); this.P5 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P5); this.P6 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P6); this.P7 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P7); this.P8 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P8); this.P9 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_P9); //습도 this.H1 = ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H1); this.H2 = (Int16)ReadUInt16Data((byte)CalibrationRegisterAddress.DIGITAL_H2); this.H3 = ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H3); this.H4 = (Int16)(ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H4) << 4 | ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H4 + 1) & 0xf); this.H5 = (Int16)(ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H5 + 1) << 4 | ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H5) >> 4); this.H6 = (Int16)ReadByteData((byte)CalibrationRegisterAddress.DIGITAL_H6); } #endregion #region 장치 초기화 하기 - InitializeDevice() /// <summary> /// 장치 초기화 하기 /// </summary> private async void InitializeDevice() { string advancedQuerySyntax = I2cDevice.GetDeviceSelector("I2C1"); DeviceInformationCollection deviceInformationCollection = await DeviceInformation.FindAllAsync(advancedQuerySyntax); I2cConnectionSettings i2cConnectionSettings = new I2cConnectionSettings(ADDRESS_BME280); i2cConnectionSettings.BusSpeed = I2cBusSpeed.FastMode; this.i2cDevice = await I2cDevice.FromIdAsync(deviceInformationCollection[0].Id, i2cConnectionSettings); await ConfigureSensor(); SetCalibrationData(); } #endregion #region 온도 데이터 읽기 - ReadTemperatureData() /// <summary> /// 온도 데이터 읽기 /// </summary> /// <returns>온도 데이터</returns> private async Task<double> ReadTemperatureData() { byte temp_msb = ReadByteData(TEMP_MSB_REGISTER_ADDRESS ); byte temp_lsb = ReadByteData(TEMP_LSB_REGISTER_ADDRESS ); byte temp_xlsb = ReadByteData(TEMP_XLSB_REGISTER_ADDRESS); Int32 rawValue = (temp_msb << 12) | (temp_lsb << 4) | (temp_xlsb >> 4); double value1; double value2; double temperature; value1 = ((rawValue / 16384.0 ) - (T1 / 1024.0)) * T2; value2 = ((rawValue / 131072.0) - (T1 / 8192.0)) * T3; this.fineTunning = (Int32)(value1 + value2); temperature = (value1 + value2) / 5120.0; await Task.Delay(1); return temperature; } #endregion #region 기압 데이터 읽기 - ReadAtmosphericPressureData() /// <summary> /// 기압 데이터 읽기 /// </summary> /// <returns>기압 데이터</returns> private async Task<double> ReadPressureData() { /* if(this.fineTunning == Int32.MinValue) { this.temperature = await ReadTemperatureData(); } */ byte press_msb = ReadByteData(PRESS_MSB_REGISTER_ADDRESS ); byte press_lsb = ReadByteData(PRESS_LSB_REGISTER_ADDRESS ); byte press_xlsb = ReadByteData(PRESS_XLSB_REGISTER_ADDRESS); Int32 rawPressure = (press_msb << 12) | (press_lsb << 4) | (press_xlsb >> 4); Int64 value1; Int64 value2; Int64 pressure; value1 = fineTunning - 128000; value2 = value1 * value1 * (Int64)P6; value2 = value2 + ((value1 * (Int64)P5) << 17); value2 = value2 + ((Int64)P4 << 35); value1 = ((value1 * value1 * (Int64)P3) >> 8) + ((value1 * (Int64)P2) << 12); value1 = (((((Int64)1 << 47) + value1)) * (Int64)P1) >> 33; if(value1 == 0) { return 0; } pressure = 1048576 - rawPressure; pressure = (((pressure << 31) - value2) * 3125) / value1; value1 = ((Int64)P9 * (pressure >> 13)) >> 25; value2 = ((Int64)P8 * pressure) >> 19; pressure = ((pressure + value1 + value2) >> 8) + ((Int64)P7 << 4); await Task.Delay(1); return (double)(pressure / 256 / 100); } #endregion #region 습도 데이터 읽기 - ReadHumidityData() /// <summary> /// 습도 데이터 읽기 /// </summary> /// <returns>습도 데이터</returns> private async Task<double> ReadHumidityData() { byte hum_msb = ReadByteData(HUM_MSB_REGISTER_ADDRESS); byte hum_lsb = ReadByteData(HUM_LSB_REGISTER_ADDRESS); int rawHumidity = (hum_msb << 8) | hum_lsb; Int32 humidity; humidity = fineTunning - 76800; humidity = (((((rawHumidity << 14) - (((Int32)H4) << 20) - ((Int32)H5 * humidity)) + ((Int32)16384)) >> 15) * (((((((humidity * ((Int32)H6)) >> 10) * (((humidity * ((Int32)H3)) >> 11) + ((Int32)32768))) >> 10) + ((Int32)2097152)) * ((Int32)H2) + 8192) >> 14)); humidity = (humidity - (((((humidity >> 15) * (humidity >> 15)) >> 7) * ((Int32)H1)) >> 4)); humidity = (humidity < 0 ? 0 : humidity); humidity = (humidity > 419430400 ? 419430400 : humidity); await Task.Delay(1); return (UInt32)((humidity >> 12) / 1000); } #endregion } } |
