Log measurements

.gitignore

@@ -2,3 +2,5 @@
 /.venv/
 /.python-version
 *.pyc
+
+/logs/

load_controller/logger.py

@@ -0,0 +1,63 @@
+import csv
+import datetime
+import sys
+import time
+from pathlib import Path
+
+from PySide6.QtCore import QObject, Signal, QTimer
+
+from .bms import BMSData
+
+
+class Logger(QObject):
+    _data: BMSData
+    _current: float
+    _log_path: Path
+    _start_time: float
+
+    _timer: QTimer
+
+    def __init__(self, bmsUpdated: Signal, currentUpdated: Signal):
+        super().__init__(None)
+
+        self._data = None
+        self._current = None
+
+        log_dir = Path(__file__).parent / ".." / "logs"
+        if not log_dir.is_dir():
+            log_dir.mkdir()
+        self._log_path = log_dir / datetime.datetime.now().strftime(
+            "%Y-%m-%d_%H:%M:%S.csv"
+        )
+        print(f"Logging to {self._log_path}")
+        self._start_time = time.time()
+
+        bmsUpdated.connect(self._updateBMS)
+        currentUpdated.connect(self._updateCurrent)
+
+        self._timer = QTimer()
+        self._timer.timeout.connect(self._log_data)
+        self._timer.start(500)
+
+    def _log_data(self):
+        if self._data is None or self._current is None:
+            print("WARNING: no data to log", file=sys.stderr)
+            return
+
+        with open(self._log_path, "a") as fh:
+            writer = csv.writer(fh)
+            writer.writerow(
+                [
+                    time.time() - self._start_time,
+                    self._data.error.value,
+                    self._current,
+                    *self._data.voltages,
+                    *self._data.temperatures,
+                ]
+            )
+
+    def _updateBMS(self, data: BMSData):
+        self._data = data
+
+    def _updateCurrent(self, current: float):
+        self._current = current

main.py

@@ -8,6 +8,7 @@ from PySide6.QtWidgets import QApplication
 
 from load_controller.gui import GUI
 from load_controller.load import Load
+from load_controller.logger import Logger
 from load_controller.profile_handler import ProfileHandler
 from load_controller.temperatures import Temperatures
 from load_controller.bms import BMSEvalBoard
@@ -29,6 +30,7 @@ def main(argv: list[str]) -> int:
     bms_thread.started.connect(bms.do_work)
     bms_thread.start()
 
+    logger = Logger(bms.dataUpdated, profile_handler.currentChanged)
     gui = GUI(profile_handler, bms.dataUpdated)
 
     return app.exec()