Discover: how to use the HC-SR501 motion sensor and Arduino UNO R4 to detect the human, how to to connect the motion sensor to Arduino UNO R4, coding for the motion sensor, and detailed programming guidance for Arduino UNO R4. You get complete instructions, codes, wiring schematics, video guides, and detailed explanations of each code line to assist beginners. Explore this and more Arduino UNO R4 guides at Newbiely.com.