采集TLC2543并外部脉冲计数，LCD1602显示测量信息，可232输出-Acquisition the TLC2543 and external pulse count, LCD1602 display measurement information 232 output

lcd1602 使用代码,主要功能,显示两行的PM2.5的值以及测试地点。-lcd1602 use the code, the main function, display two lines of PM2.5 values ​ ​ and test sites.

基于AT89S52和LCD1602开发的出租车计价器，能显示日期，时间，早晚不同的价格调整。-Based on AT89S52 and LCD1602 developed taxi meter, can show the date, time, and sooner or later different price adjustment.