Research And Realization Of Indoor Pm2.5 Purification System Based On Ble

With the rapid development of society and economy,air pollution caused by industrial production and people’s daily life is increasingly serious.Air pollutants(especially PM2.5)have become the main "killer" affecting people’s health.Eliminating and purifying air is becoming a major problem that the entire society needs to solve urgently.In the present situation in which it is difficult for society to eliminate outdoor air pollutants in a short period of time,purifying indoor air has become one of the important goals to be solved first.Studies have shown that small-diameter ecological negative ions can effectively eliminate PM2.5,and plants are the best source of primary air negative ions.However,under normal circumstances,the ability of individual plants to produce negative air ions is limited,and their PM2.5 purification ability is weak.Based on the mechanism that plants produce air negative ions through various ways such as leaf discharge and photosynthesis,this paper uses the principle of external pulsed electric field to stimulate individual plants to produce air negative ions efficiently,and studies and designs an indoor PM2.5 purification system based on Bluetooth low energy technology.According to the functional requirements and research objectives,this paper improves the software and hardware design based on previous research,and implements functions of the system on the embedded software and hardware platform:PM2.5 purification function,prevention incorrect-contact function,PM2.5 real-time monitoring function and pulse control function.The system uses STM32F103RCT6 as the main controller to complete the data processing and control functions,and uses nRF51822 as the Bluetooth connection chip to complete the data transmission function.The main controller generates pulse and acts it on the hardware circuit,and finally outputs electric field required by the potted plant through the electrode to complete the PM2.5 purification function;the main controller collects the data of the infrared ranging sensor in real time and the potted plant When there are people or things in the surrounding,the main controller closes the pulse generation channel and completes the anti-misoperation function.The main controller collects and processes the PM2.5 sensor data in real time,and sends it to the mobile phone terminal for display after the Bluetooth chip transits to complete PM2.5 real-time monitoring function;the mobile phone sends a control command to the down machine,and after the Bluetooth chip transmits it to the main controller,it can freely open or close the pulse generation channel to complete the pulse control function.Finally,the paper through a complete system test,the various functional modules were tested and analyzed,reached the predetermined research objectives,and basically meet the needs of indoor PM2.5 purification system.