纸张计数显示实验装置的研制

Experimental Study on Paper Counting Display Device

针对纸张计数问题,采用555芯片构成多谐振荡器,设计一种纸张计数显示实验装置。将待测纸张的极板电容转换为脉冲频率,再将脉冲频率送到STC89C52单片机进行处理,用拟合函数得到待测纸张数,最后,通过LCD1602显示纸张数。实验结果表明:本纸张计数显示实验装置能实现自校准、短路报警、检测纸张数等功能,能检测30页以内的纸张数,误差控制在1张以内。

Aiming at the current problems in paper counting,an astable multivibrator was constituted by 555 timer,and a paper counting display device was designed.With paper sheets placed between two polar plates,the corresponding capacitance could be transformed to frequency and then the impulse frequency would be sent to STC89C52 and processed by it.Through the operation function of single chip computer,the number of paper sheets could be judged by fitting curve of measured data module.The number of paper sheets could be displayed by LCD 1602.The experimental results showed that the experiment device could realize some functions as self-calibration,short circuit alarming and paper sheets testing and so on.The error could be controlled less than one when the paper sheets were within 30 pages.