Just finished building a complete IoT security system! Features PIR motion detection, web-based control with PIN authentication, dual LED indicators, and a buzzer alarm. The web UI has a modern gradient design with smooth animations - no more generic Arduino UIs! Tech: Arduino R4 WiFi, PIR sensor, C++, HTML/CSS Cost: ~$50-75 License: MIT (open source) Includes full documentation, test logs, and circuit diagrams. Perfect beginner-to-intermediate IoT project! GitHub: https://github.com/DantesPrograms/arduino-security-system/