Better makefile, plotting, saving the data, and cleanup

plot.py

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+import os
+import matplotlib.pyplot as plt
+import numpy as np
+
+DATA_DIR = "data"
+SAMPLE_INTERVAL_MS = 300  # time between measurements in milliseconds
+
+# Find the latest data file
+files = [f for f in os.listdir(DATA_DIR) if f.startswith("voltages_") and f.endswith(".txt")]
+if not files:
+    raise FileNotFoundError("No voltage data files found in 'data/'")
+
+latest_file = max(files, key=lambda f: os.path.getmtime(os.path.join(DATA_DIR, f)))
+filepath = os.path.join(DATA_DIR, latest_file)
+print(f"Plotting data from {filepath}")
+
+# Load voltage values
+voltages = np.loadtxt(filepath)
+
+# Create time axis (in seconds)
+times = np.arange(len(voltages)) * (SAMPLE_INTERVAL_MS / 1000.0)
+
+# Plot
+plt.figure(figsize=(10, 5))
+plt.plot(times, voltages, marker='o', linestyle='-')
+plt.xlabel("Time (s)")
+plt.ylabel("Voltage (V)")
+plt.title(f"Voltage Measurements ({latest_file})")
+plt.grid(True)
+plt.tight_layout()
+plt.show()