A door and window access control system based on STM32 MCU was designed to address such problems as non-timely management, large consumption of human resources, and low efficiency typical of public door and window management in residential communities. The system, based on traditional door access control design, utilizes Zigbee wireless sensing network technology to implement the wireless communication among door and window access controllers. The system, which is controllable by the administrator user by means of the Ethernet, is additionally capable of automatic regulation in response to the environmental data detected by the sensors. Also, distributed self-adapting interference technology based on frequency agility is used in an attempt to solve the WIFI signal interference encountered in residential community environments. This system is then tested and is found to work stably, promising a prospect of extensive application.