Explore the versatile HC-SR501 PIR motion sensor in this comprehensive 42-minute video tutorial. Discover how Passive Infrared Sensors function and learn to connect the HC-SR501 to a relay for controlling external devices triggered by human or animal motion. Gain hands-on experience with various demonstrations, including adding a light sensor for nightlight applications, integrating with Arduino for enhanced functionality, and combining with a Raspberry Pi Zero W and camera to create an intruder detection system. Follow along with step-by-step instructions to build projects such as a motion-activated camera for capturing images and videos. Access accompanying code, detailed articles, and downloadable resources to further enhance your learning experience.