Explore a detailed walkthrough of a simple Arduino/nRF24L01 switch-triggered module project. Learn about power supply considerations, wireless data transmission using nRF24L01+, microcontroller implementation, and PCB design techniques. Discover how to adapt this versatile "bin lid monitor" module for various applications such as detecting mail, monitoring gates or garden shed doors, and even as a burglar alarm detector. Gain insights into power management, battery charging with TP4056, and using EasyEDA for PCB design. Follow along as common mistakes are addressed and overcome, providing valuable lessons in project development and troubleshooting.