基于Cotex-M4和LoRa的室内人员疲劳监测系统实现

摘要

针对室内人员高强度工作导致疲劳无法及时发现以及室内定位、组网的复杂性问题,提出了基于Cortex-M4和LoRa的室内人员疲劳监测系统实现.该系统以Cotex-M4内核的STM32L476低功耗单片机为核心.首先,通过Pulse Senor传感器实时采集人的脉搏;其次,调用DSP库实现快速傅里叶变换(FFT),利用FIR带通滤波器提取频谱;最后,实验测得第一主峰、频谱能量系数(K)以及LoRa的RSSI指标,表明系统具有室内定位、疲劳监测等功能,可以广泛应用于办公室员工、学校学生监测保护.%Aiming at the fatigue of the high intensity work of the indoor staffs being timely found and the complexity of indoor and positioning networking,a indoor fatigue monitoring system based on Cortex-M4 and LoRa is designed and implemented. The system takes the STM32L476 of Cortex-M4 low-power single-chip as the core. Firstly,the human pulse signal is timely collected by the Pulse Senor. Secondly,the DSP library is used to achieve the Fast Fourier transform(FFT),then the FIR band pass filter to extract the spectrum. Finally,through the experiments,these infor-mation such as the pulse,the first main peak,the spectral energy coefficient(K) and the RSSI of LoRa promise the system are obtained the indoor positioning,fatigue monitoring,system can be widely used to monitor and protect the office staffs and school students.