feat: ported barometer instrument

lib/constants.dart

@@ -166,3 +166,10 @@ String lx = 'Lx';
 String maxScaleError = 'Max Scale';
 String lightSensorError = 'Light sensor error:';
 String lightSensorInitialError = 'Failed to initialize light sensor:';
+String barometerTitle = 'Barometer';
+String atm = 'atm';
+String barometerSensorInitialError = 'Failed to initialize barometer sensor:';
+String barometerSensorError = 'Barometer sensor error occurred';
+String barometerNotAvailable = 'Barometer sensor not available on this device';
+String meterUnit = 'm';
+String altitudeLabel = 'Altitude';

lib/main.dart

@@ -3,6 +3,7 @@ import 'package:provider/provider.dart';
 import 'package:pslab/providers/board_state_provider.dart';
 import 'package:pslab/providers/locator.dart';
 import 'package:pslab/view/accelerometer_screen.dart';
+import 'package:pslab/view/barometer_screen.dart';
 import 'package:pslab/view/connect_device_screen.dart';
 import 'package:pslab/view/faq_screen.dart';
 import 'package:pslab/view/gyroscope_screen.dart';
@@ -53,6 +54,7 @@ class MyApp extends StatelessWidget {
         '/accelerometer': (context) => const AccelerometerScreen(),
         '/gyroscope': (context) => const GyroscopeScreen(),
         '/luxmeter': (context) => const LuxMeterScreen(),
+        '/barometer': (context) => const BarometerScreen(),
       },
     );
   }

lib/providers/barometer_state_provider.dart

@@ -0,0 +1,166 @@
+import 'dart:async';
+import 'dart:math';
+import 'package:fl_chart/fl_chart.dart';
+import 'package:flutter/material.dart';
+import 'package:pslab/others/logger_service.dart';
+import 'package:sensors_plus/sensors_plus.dart';
+import 'package:flutter/foundation.dart';
+import 'package:pslab/constants.dart';
+
+class BarometerStateProvider extends ChangeNotifier {
+  double _currentPressure = 0.0;
+  StreamSubscription? _barometerSubscription;
+  Timer? _timeTimer;
+  final List<double> _pressureData = [];
+  final List<double> _timeData = [];
+  final List<FlSpot> pressureChartData = [];
+  double _startTime = 0;
+  double _currentTime = 0;
+  final int _maxLength = 50;
+  double _pressureMin = 0;
+  double _pressureMax = 0;
+  double _pressureSum = 0;
+  int _dataCount = 0;
+  bool _sensorAvailable = true;
+
+  Function(String)? onSensorError;
+
+  void initializeSensors({Function(String)? onError}) {
+    onSensorError = onError;
+
+    try {
+      _startTime = DateTime.now().millisecondsSinceEpoch / 1000.0;
+      _timeTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
+        _currentTime =
+            (DateTime.now().millisecondsSinceEpoch / 1000.0) - _startTime;
+        if (_sensorAvailable) {
+          _updateData();
+        }
+        notifyListeners();
+      });
+
+      _barometerSubscription = barometerEventStream().listen(
+        (BarometerEvent event) {
+          _currentPressure = event.pressure / 1013.25;
+          _sensorAvailable = true;
+          notifyListeners();
+        },
+        onError: (error) {
+          logger.e("$barometerSensorError $error");
+          _handleSensorError(error);
+        },
+        cancelOnError: false,
+      );
+    } catch (e) {
+      logger.e("$barometerSensorInitialError $e");
+      _handleSensorError(e);
+    }
+  }
+
+  void _handleSensorError(dynamic error) {
+    _sensorAvailable = false;
+    String errorString = error.toString().toLowerCase();
+    if (errorString.contains('not available') ||
+        errorString.contains('not supported') ||
+        errorString.contains('sensor not found') ||
+        errorString.contains('no sensor')) {
+      _handleSensorNotAvailable();
+    } else {
+      onSensorError?.call(barometerSensorError);
+    }
+  }
+
+  void _handleSensorNotAvailable() {
+    _sensorAvailable = false;
+    onSensorError?.call(barometerNotAvailable);
+  }
+
+  void disposeSensors() {
+    _barometerSubscription?.cancel();
+    _timeTimer?.cancel();
+  }
+
+  @override
+  void dispose() {
+    disposeSensors();
+    super.dispose();
+  }
+
+  void _updateData() {
+    if (!_sensorAvailable) return;
+
+    final pressure = _currentPressure;
+    final time = _currentTime;
+    _pressureData.add(pressure);
+    _timeData.add(time);
+    _pressureSum += pressure;
+    _dataCount++;
+    if (_pressureData.length > _maxLength) {
+      final removedValue = _pressureData.removeAt(0);
+      _timeData.removeAt(0);
+      _pressureSum -= removedValue;
+      _dataCount--;
+    }
+    if (_pressureData.isNotEmpty) {
+      _pressureMin = _pressureData.reduce(min);
+      _pressureMax = _pressureData.reduce(max);
+    }
+    pressureChartData.clear();
+    for (int i = 0; i < _pressureData.length; i++) {
+      pressureChartData.add(FlSpot(_timeData[i], _pressureData[i]));
+    }
+    notifyListeners();
+  }
+
+  double _pressureToAltitude(double pressureAtm) {
+    const double seaLevelPressureAtm = 1.0;
+    const double temperatureK = 288.15;
+    const double lapseRate = 0.0065;
+    const double gasConstant = 287.05;
+    const double gravity = 9.80665;
+
+    if (pressureAtm <= 0) return 0.0;
+
+    double altitude = (temperatureK / lapseRate) *
+        (1 -
+            pow(pressureAtm / seaLevelPressureAtm,
+                (gasConstant * lapseRate) / gravity));
+
+    return altitude;
+  }
+
+  double getCurrentPressure() => _currentPressure;
+  double getMinPressure() => _pressureMin;
+  double getMaxPressure() => _pressureMax;
+  double getAveragePressure() =>
+      _dataCount > 0 ? _pressureSum / _dataCount : 0.0;
+
+  double getCurrentAltitude() => _pressureToAltitude(_currentPressure);
+  double getMinAltitude() =>
+      _pressureMin > 0 ? _pressureToAltitude(_pressureMax) : 0.0;
+  double getMaxAltitude() =>
+      _pressureMax > 0 ? _pressureToAltitude(_pressureMin) : 0.0;
+  double getAverageAltitude() => _pressureToAltitude(getAveragePressure());
+
+  double getMaxAltitudeForChart() =>
+      _pressureMax > 0 ? _pressureToAltitude(0) : 10000.0;
+  double getMinAltitudeForChart() =>
+      _pressureMin > 0 ? _pressureToAltitude(_pressureMax * 1.1) : 0.0;
+  double getAltitudeInterval() {
+    double maxAlt = getMaxAltitudeForChart();
+    return maxAlt > 0 ? (maxAlt / 5) : 2000;
+  }
+
+  List<FlSpot> getPressureChartData() => pressureChartData;
+  int getDataLength() => pressureChartData.length;
+  double getCurrentTime() => _currentTime;
+  double getMaxTime() => _timeData.isNotEmpty ? _timeData.last : 0;
+  double getMinTime() => _timeData.isNotEmpty ? _timeData.first : 0;
+  double getTimeInterval() {
+    if (_currentTime <= 10) return 2;
+    if (_currentTime <= 30) return 5;
+    return 10;
+  }
+
+  bool get sensorAvailable => _sensorAvailable;
+}