对在线商品进行数据采集，利用单片机对产品数量进行计数，通过数码管LED进行显示。

2、对在线商品产量的上下限各设一个默认的数值，利用数码管LED 显示上下限，通过键 盘按键对上下限进行设置，使上限不可以超过99、下限不可以低于0，并且上限的设置不能小于下限，同样下限的设置也不能大于上限。

-The online commodity data acquisition, the use of single-chip count on the number of products through the digital LED display. 2, online commodity production on the ends of the range to set a default value, use of digital control LED display on the lower limit, the upper and lower limits set by the keyboard keys, so that the upper limit may not exceed 99, the lower limit may not be less than 0, and the upper limit settings can not be less than the lower limit, the same lower limit can not be greater than the upper limit set.