电容型人体接近感知系统的研究与实现

Research and Realization of Capacitive Human Body Proximity Perceptual System

针对广泛应用的人机交互设备,以STM32为控制核心,设计并实现了一种电容型人体接近探测系统,能够感知人体有无并用于系统自动唤醒。系统以电容型接近传感器对接近的人体敏感特性为前提,采用电容数字转换器FDC1004作为测量器件,辅以环境温度补偿和光线感应模块,具有电路简单、测量精度高及抗干扰能力强等特点。实验结果表明,除能够感知0~30 cm范围内人体有无外,还能够精确测量0~5 cm范围内的人体接近距离,并在TFT-LCD液晶屏上显示。针对不同的应用场合,灵活调整传感器尺寸,可以实现不同距离的感知和测量。

Aiming at the widely used human-computer interaction equipment,with STM32 as the control core,a capacitive human body proximity detection system is designed and implemented,which can sense the presence of human body and be used for automatic wake-up of the system.Based on the premise that the capacitive proximity sensor is sensitive to the approaching human body,the system uses a capacitive-to-digital converter FDC1004 as a measurement device,supplemented by ambient temperature compensation and a light sensing module.It has the characteristics of simple circuits,high measurement accuracy,and strong anti-interference ability.The experimental results show that in addition to being able to sense the presence of the human body in the range of 0~30 cm,it is also possible for the system to accurately measure the human body proximity distance in the range of 0~5 cm,and display the measurements on the TFT-LCD screen.The size of the sensor is adjustable so that the system can detect and measure different distances.