人体感应键盘实现方法

Human Sensor Combination Keyboard

设计了一种单片机应用系统中的人体感应键盘实现方法,基本原理是利用低压状态下人体具有导电性,通过检测按键两端的电压来判断按键是否被按下.按键接触端需组合使用,采用单片机一路中断资源控制,由SN74LVC1T45DBVR CT1R芯片充当电压放大器,两路单片机I/O控制该芯片组成按键的一个接触端.经试验该按键方法稳定、可靠.

A method to realize the human induction keyboard in the application system of single chip microcomputer is introduced in this paper.Its basic principle is to use the human body to conduct electricity under low pressure,and to judge whether the key is pressed by detecting the voltage at both ends of the key.The key contact end needs to be combined and used with the single-chip one way interrupt resource control.The chip,SN74LVC1T45DBVR CT1R,acts as a voltage amplifier and the two-way single-chip I/O controls the chip to form a contact end of the key.Through tests,the key method is stable and reliable.