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一、工作原理及硬件电路 (一)工作原理成品茶叶在水份、碎末含量符合规定的前提下,其等级指标与容重密切相关。附表列出了浙江烘青茶的等级与容重的关系。图1是应用容重分等的原理设计的茶叶分等仪的原理图。茶叶分等仪由小量程的电子秤称重电路配上存有各种等级容重参数的单片机系统组成。装有1升茶样的量简(茶样需事先在振动机上振动1.5分钟)放在称重传感器上,同时用键盘输入待评茶种编号。传感器输出的电压信号。经放大后,转换成频率信号,送至8031的T。端,由内部计时器T_1记录T_0端变化一周所需之时间。此时模拟的重量信号已变成数字信号,
First, the working principle and the hardware circuit (A) Working principle Finished tea leaves in the water, the content of fines meet the provisions of the premise, the level of indicators and bulk density are closely related. The table lists the level of Zhejiang bake green tea and the relationship between bulk density. Figure 1 is the principle of grading the principle of weight design of the principle diagram of tea instrument. Tea instrument by a small range of electronic scale weighing circuit coupled with a variety of grayscale parameters of the single-chip microcomputer system. Put 1 liters of tea-like amount of Jane (tea samples need to vibrate on the vibration machine for 1.5 minutes in advance) on the load cell, while using the keyboard to enter the number of tea to be evaluated. Sensor output voltage signal. After amplification, converted to a frequency signal, sent to the 8031 of T. End, by the internal timer T_1 record T_0 end of the change of the time required. The simulated weight signal has now become a digital signal,