46 lines
1.2 KiB
Python
46 lines
1.2 KiB
Python
import os
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import matplotlib.pyplot as plt
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import matplotlib.dates as mdates
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import numpy as np
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from datetime import datetime
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DATA_DIR = "data"
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# Find the latest data file
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files = [f for f in os.listdir(DATA_DIR) if f.startswith("voltages_") and f.endswith(".csv")]
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if not files:
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raise FileNotFoundError("No voltage data files found in 'data/'")
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latest_file = max(files, key=lambda f: os.path.getmtime(os.path.join(DATA_DIR, f)))
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filepath = os.path.join(DATA_DIR, latest_file)
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print(f"Plotting data from {filepath}")
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# Load CSV data
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timestamps = []
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voltages = []
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with open(filepath, "r") as f:
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next(f) # skip header
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for line in f:
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ts_str, v_str = line.strip().split(",")
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ts = datetime.strptime(ts_str, "%Y-%m-%d %H:%M:%S.%f")
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timestamps.append(ts)
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voltages.append(float(v_str))
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# Plot
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plt.figure(figsize=(12, 5))
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plt.scatter(timestamps, voltages, marker='o', linestyle='-', s=0.1)
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plt.xlabel("Time (CET)")
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plt.ylabel("Voltage (V)")
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plt.title(f"Voltage Measurements ({latest_file})")
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plt.grid(True)
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# Format x-axis for readable time
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plt.gcf().autofmt_xdate()
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plt.gca().xaxis.set_major_formatter(mdates.DateFormatter("%H:%M:%S"))
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plt.tight_layout()
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plt.show()
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