Design of a Closed-Loop Control-Based Intelligent Fan System Using STM32

Abstract

With increasing demands for living comfort and rapid advancements in IoT technology, this paper designs and implements a smart fan system centered on the STM32F103C8T6 microcontroller. By integrating hardware components such as the DHT11 temperature and humidity sensor, SR501 human body infrared sensor, and MQ135 air quality sensor, the system establishes a diversified intelligent control framework combining manual operation, sensing, automatic adjustment, environmental control, and scheduling. Additionally, it incorporates an ASRPRO voice module and an ESP8266 WiFi module to enable data exchange via the MQTT protocol. A companion Android mobile app allows users to remotely adjust fan speeds, view environmental data, and set thresholds. The innovation of this system lies in its integration of multi-sensor data for intelligent environmental perception control, enhanced by voice and network technologies that improve interaction convenience. It not only provides users with a comfortable and convenient experience but also offers an innovative solution for the smart home sector, holding significant research value and broad application prospects.