如何在树莓派上通过Nginx从HTML页面运行Python脚本？

Got it, let’s get your web interface to trigger that motor script—here’s a couple of solid approaches tailored to your existing Raspberry Pi Zero setup:

Since you already have Nginx up and running, using CGI is the easiest way to bridge your static HTML page to your Python motor script.

• First, install fcgiwrap (Nginx doesn’t handle CGI directly, so this tool acts as a middleman):

  sudo apt-get update && sudo apt-get install fcgiwrap
  

• Edit your Nginx config (usually at /etc/nginx/sites-available/default) to enable CGI support. Add this block inside your existing server section:

  location /cgi-bin/ {
      root /var/www;
      fastcgi_pass unix:/var/run/fcgiwrap.socket;
      fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
      include fastcgi_params;
  }
  

  Restart Nginx to apply changes:

  sudo systemctl restart nginx
  

• Create a CGI script to trigger your motor code. Make a /var/www/cgi-bin/ directory if it doesn’t exist, then add a file named run_motor.cgi:

  #!/usr/bin/env python3
  print("Content-Type: text/html\n")
  print("<html><body>")
  
  import subprocess
  try:
      # Replace with the actual path to your motor script
      subprocess.run(["python3", "/home/pi/motor_run.py"], check=True)
      print("<p>Motor started successfully!</p>")
  except subprocess.CalledProcessError as e:
      print(f"<p>Error running motor: {str(e)}</p>")
  
  print("<a href='/'>Back to control page</a>")
  print("</body></html>")
  

• Fix permissions so the Nginx user (www-data) can run the script:

  sudo chmod +x /var/www/cgi-bin/run_motor.cgi
  # Give www-data access to GPIO (critical for motor control)
  sudo usermod -aG gpio www-data
  

• Update your /var/www/html/index.html to add a trigger button:

  <!DOCTYPE html>
  <html>
  <body>
      <h1>Motor Control</h1>
      <button onclick="window.location.href='/cgi-bin/run_motor.cgi'">Start Motor</button>
      <!-- Alternative: Use a POST form to avoid browser caching issues -->
      <form action="/cgi-bin/run_motor.cgi" method="post" style="margin-top:10px;">
          <input type="submit" value="Start Motor (POST)">
      </form>
  </body>
  </html>
  

Since you mentioned wanting to let users customize parameters (like run time or schedule), a lightweight Flask app is perfect for this—it lets you build interactive forms easily.

• Install Flask:

  sudo pip3 install flask
  

• Create a Flask app file (e.g., /home/pi/motor_app.py):

  from flask import Flask, render_template, request
  import subprocess
  
  app = Flask(__name__)
  
  # Main page with parameter form
  @app.route('/')
  def index():
      return render_template('index.html')
  
  # Handle motor trigger with custom params
  @app.route('/trigger_motor', methods=['POST'])
  def trigger_motor():
      # Get user input from form (default to 5 seconds if not specified)
      run_seconds = request.form.get('run_seconds', default=5, type=int)
      
      try:
          # Pass the custom run time to your motor script
          subprocess.run(["python3", "/home/pi/motor_run.py", str(run_seconds)], check=True)
          return f"<p>Motor running for {run_seconds} seconds! <a href='/'>Back to control</a></p>"
      except subprocess.CalledProcessError as e:
          return f"<p>Error: {str(e)} <a href='/'>Back to control</a></p>"
  
  if __name__ == '__main__':
      # Run the app on all network interfaces (so your phone can reach it)
      app.run(host='0.0.0.0', port=80, debug=True)
  

• Create a templates folder next to your Flask app, and add index.html inside it:

  <!DOCTYPE html>
  <html>
  <body>
      <h1>Custom Motor Control</h1>
      <form action="/trigger_motor" method="post">
          <label>Run time (seconds):</label>
          <input type="number" name="run_seconds" min="1" max="60" value="5">
          <br><br>
          <input type="submit" value="Start Motor">
      </form>
  </body>
  </html>
  

• Run the Flask app (to keep it running in the background, use nohup or set up a systemd service):

  nohup python3 /home/pi/motor_app.py &
  

• Connect your phone to the Pi’s AP, visit 192.168.4.1, and click the button—your motor should run!
• If it doesn’t work, check logs:

  # Nginx error logs
  sudo tail -f /var/log/nginx/error.log
  # Flask logs (if using that approach)
  cat nohup.out
  

• Double-check that www-data is in the gpio group (you may need to reboot the Pi for this to take full effect).

内容的提问来源于stack exchange，提问作者Bradderz