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Yugesh-Kumar-SYugesh-Kumar-S
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feat: integrated bmp180 sensor in barometer instrument (#2806)
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4 files changed

+688
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‎lib/communication/sensors/bmp180.dart

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import 'dart:math';
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import 'package:pslab/communication/peripherals/i2c.dart';
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import 'package:pslab/communication/science_lab.dart';
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import 'package:pslab/others/logger_service.dart';
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import '../../l10n/app_localizations.dart';
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import '../../providers/locator.dart';
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class BMP180 {
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AppLocalizations appLocalizations = getIt.get<AppLocalizations>();
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static const String tag = "BMP180";
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static const int address = 0x77;
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static const int ultraLowPower = 0;
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static const int standard = 1;
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static const int highRes = 2;
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static const int ultraHighRes = 3;
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static const int calAC1 = 0xAA;
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static const int calAC2 = 0xAC;
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static const int calAC3 = 0xAE;
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static const int calAC4 = 0xB0;
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static const int calAC5 = 0xB2;
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static const int calAC6 = 0xB4;
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static const int calB1 = 0xB6;
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static const int calB2 = 0xB8;
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static const int calMB = 0xBA;
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static const int calMC = 0xBC;
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static const int calMD = 0xBE;
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static const int control = 0xF4;
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static const int tempData = 0xF6;
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static const int pressData = 0xF6;
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static const int readTempCmd = 0x2E;
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static const int readPressureCmd = 0x34;
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int mode = highRes;
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int oversampling = highRes;
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static const int numPlots = 3;
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static const List<String> plotNames = ["Temperature", "Pressure", "Altitude"];
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static const String name = "Altimeter BMP180";
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final I2C i2c;
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late int ac1, ac2, ac3, ac4, ac5, ac6, b1, b2, mb, mc, md;
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double temperature = 0.0;
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double pressure = 0.0;
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static const double seaLevelPressure = 101325.0;
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BMP180._(this.i2c);
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bool _validateCalibrationValues() {
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if (ac1 == 0 || ac2 == 0 || ac3 == 0 || ac4 == 0 || ac5 == 0 || ac6 == 0) {
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return false;
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}
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if (ac1 < -32768 || ac1 > 32767) return false;
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if (ac2 < -32768 || ac2 > 32767) return false;
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if (ac3 < -32768 || ac3 > 32767) return false;
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if (ac4 < 0 || ac4 > 65535) return false;
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if (ac5 < 0 || ac5 > 65535) return false;
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if (ac6 < 0 || ac6 > 65535) return false;
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if (b1 < -32768 || b1 > 32767) return false;
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if (b2 < -32768 || b2 > 32767) return false;
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if (mb < -32768 || mb > 32767) return false;
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if (mc < -32768 || mc > 32767) return false;
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if (md < -32768 || md > 32767) return false;
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return true;
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}
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static Future<BMP180> create(I2C i2c, ScienceLab scienceLab) async {
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final bmp180 = BMP180._(i2c);
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await bmp180._initializeCalibrationValues(scienceLab);
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if (!bmp180._validateCalibrationValues()) {
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throw Exception('BMP180 calibration values are invalid or out of range.');
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}
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return bmp180;
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}
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Future<void> _initializeCalibrationValues(ScienceLab scienceLab) async {
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if (!scienceLab.isConnected()) {
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throw Exception("ScienceLab not connected");
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}
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try {
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ac1 = await readInt16(calAC1);
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ac2 = await readInt16(calAC2);
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ac3 = await readInt16(calAC3);
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ac4 = await readUInt16(calAC4);
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ac5 = await readUInt16(calAC5);
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ac6 = await readUInt16(calAC6);
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b1 = await readInt16(calB1);
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b2 = await readInt16(calB2);
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mb = await readInt16(calMB);
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mc = await readInt16(calMC);
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md = await readInt16(calMD);
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logger.d(
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"Calibration values: [$ac1, $ac2, $ac3, $ac4, $ac5, $ac6, $b1, $b2, $mb, $mc, $md]");
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} catch (e) {
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logger.e("Error initializing BMP180 calibration values: $e");
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rethrow;
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}
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}
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Future<int> readInt16(int registerAddress) async {
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try {
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List<int> data = await i2c.readBulk(address, registerAddress, 2);
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if (data.length < 2) {
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throw Exception(
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"Expected 2 bytes but got ${data.length} from register $registerAddress");
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}
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int value = ((data[0] & 0xFF) << 8) | (data[1] & 0xFF);
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if (value >= 0x8000) value -= 0x10000;
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return value;
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} catch (e) {
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logger.e("Error reading int16 from register $registerAddress: $e");
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rethrow;
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}
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}
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Future<int> readUInt16(int registerAddress) async {
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try {
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List<int> data = await i2c.readBulk(address, registerAddress, 2);
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if (data.length < 2) {
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throw Exception(
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"Expected 2 bytes but got ${data.length} from register $registerAddress");
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}
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return ((data[0] & 0xFF) << 8) | (data[1] & 0xFF);
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} catch (e) {
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logger.e("Error reading uint16 from register $registerAddress: $e");
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rethrow;
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}
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}
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Future<int> readRawTemperature() async {
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try {
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await i2c.write(address, [readTempCmd], control);
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await Future.delayed(const Duration(milliseconds: 5));
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int raw = await readUInt16(tempData);
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return raw;
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} catch (e) {
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logger.e("Error reading raw temperature: $e");
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rethrow;
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}
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}
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Future<double> readTemperature({int? rawTemp}) async {
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try {
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int ut = rawTemp ?? await readRawTemperature();
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int x1 = ((ut - ac6) * ac5) >> 15;
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int x2 = (mc << 11) ~/ (x1 + md);
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int b5 = x1 + x2;
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temperature = ((b5 + 8) >> 4) / 10.0;
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return temperature;
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} catch (e) {
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logger.e("Error reading temperature: $e");
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rethrow;
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}
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}
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void setOversampling(int num) {
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oversampling = num;
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}
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Future<int> readRawPressure() async {
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try {
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List<int> delays = [5, 8, 14, 26];
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int safeOversampling = oversampling.clamp(0, 3);
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await i2c.write(address, [readPressureCmd + (mode << 6)], control);
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await Future.delayed(Duration(milliseconds: delays[safeOversampling]));
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List<int> data = await i2c.readBulk(address, pressData, 3);
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if (data.length < 3) {
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throw Exception(
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"Expected 3 bytes but got ${data.length} from pressure data");
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}
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int msb = data[0] & 0xFF;
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int lsb = data[1] & 0xFF;
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int xlsb = data[2] & 0xFF;
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return ((msb << 16) + (lsb << 8) + xlsb) >> (8 - mode);
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} catch (e) {
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logger.e("Error reading raw pressure: $e");
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rethrow;
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}
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}
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Future<double> readPressure({int? rawTemp}) async {
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try {
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int ut = rawTemp ?? await readRawTemperature();
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int up = await readRawPressure();
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int x1 = ((ut - ac6) * ac5) >> 15;
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int x2 = (mc << 11) ~/ (x1 + md);
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int b5 = x1 + x2;
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int b6 = b5 - 4000;
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x1 = (b2 * (b6 * b6) >> 12) >> 11;
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x2 = (ac2 * b6) >> 11;
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int x3 = x1 + x2;
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int b3 = (((ac1 * 4 + x3) << mode) + 2) ~/ 4;
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x1 = (ac3 * b6) >> 13;
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x2 = (b1 * ((b6 * b6) >> 12)) >> 16;
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x3 = ((x1 + x2) + 2) >> 2;
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int b4 = (ac4 * (x3 + 32768)) >> 15;
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int b7 = (up - b3) * (50000 >> mode);
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int p;
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if (b7 < 0x80000000) {
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p = (b7 * 2) ~/ b4;
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} else {
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p = (b7 ~/ b4) * 2;
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}
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x1 = (p >> 8) * (p >> 8);
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x1 = (x1 * 3038) >> 16;
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x2 = (-7357 * p) >> 16;
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pressure = (p + ((x1 + x2 + 3791) >> 4)).toDouble();
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return pressure;
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} catch (e) {
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logger.e("Error reading pressure: $e");
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rethrow;
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}
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}
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double altitude() {
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return 44330.0 * (1 - pow(pressure / seaLevelPressure, 1 / 5.255));
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}
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double seaLevel(double pressure, double altitude) {
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return pressure / pow(1 - (altitude / 44330.0), 5.255);
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}
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Future<Map<String, double>> getRawData() async {
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try {
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int rawTemp = await readRawTemperature();
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temperature = await readTemperature(rawTemp: rawTemp);
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pressure = await readPressure(rawTemp: rawTemp);
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double alt = altitude();
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return {
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'temperature': temperature,
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'pressure': pressure,
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'altitude': alt,
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};
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} catch (e) {
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logger.e("Error getting raw data: $e");
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rethrow;
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}
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}
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}

‎lib/l10n/app_localizations_en.dart

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@override
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String get fileDeleted => 'File deleted';
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@override
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String get soundmeterConfig => 'Soundmeter Configurations';
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@override

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