An indoor environmental monitoring program developed for a smart home business. The system uses STM32F103 as the main control, and achieves multi-point temperature and humidity acquisition through the DHT22 sensor. The data is uploaded to the cloud through the ESP8266 WiFi module, and users can view the history curve and receive abnormal alarms in real time through the mobile app. The project includes hardware schematic design, PCB Layout, embedded firmware development, cloud interface docking, and app debugging support. The entire development cycle is about 6 weeks.