本系统是由 A T 89C 51单片机作为核心控制，采用自制电容式传感器和单片机计数电路、显示电路组成。
直流稳压电源为单片机提供 5V 工作电压，将纸张放在电容式传感器两个极板之间，使电容传感器的介电常数发生变
化，检测电路通过两条屏蔽线与电容传感器两极板连接，采集到变化的脉冲信号，经过振荡电路产生具有稳定周期的方
波信号，方波进入单片机进行编译计数，最终数码管短时间内显示纸张的数量，系统控制方便，操作简单，可用于中小规模纸张计数。
The system is controlled by AT89C51 single chip microcomputer as the core, and is composed of self-made capacitive sensor, counting circuit and display circuit. The paper is placed between the two plates of the capacitive sensor to make the dielectric constant of the capacitive sensor change. The detection circuit is connected with the two plates of the capacitive sensor through two shielding wires to collect the changing pulse signal and generate the square wave signal with stable period through the oscillation circuit. Square wave enters the MCU to compile and count, and finally the digital tube displays the number of paper in a short time.The system is easy to control and operate, and can be used for small and medium-sized paper counting.
