Further reading

• To delve in far greater depth into using the Raspberry Pi Camera, I recommend the PiCamera Documentation, available at https://picamera.readthedocs.io/.
• Also, to gain insight into further techniques, the Py Image Search website, at https://www.pyimagesearch.com, has great resources.
• OpenCV and visual processing are a complex topic, only briefly covered here. I recommend OpenCV 3 Computer Vision With Python Cookbook, available at https://www.packtpub.com/application-development/opencv-3-computer-vision-python-cookbook, for more information.
• Streaming video through Flask is a neat trick, and is explored further in Video Streaming With Flask, at https://blog.miguelgrinberg.com/post/video-streaming-with-flask.
• I recommend the Flask Books at https://flaskbook.com/ for other neat ways to use Flask to manage your robot from your phone or laptop.
• Tuning A PID Controller...