说明：  在做点阵之前先来了解下点阵的原理和点阵显示的过程。 点阵实际上就是64个单独的led灯排列为8行8列 ROW1-8、COL1-8分别控制行和列的1-8led。ROWx高电平、COLy低电平，对应的第x行、第y列led灯亮。
(Before making a lattice, first understand the principle of the next lattice and the process of lattice display. The lattice is actually 64 individual LED lights arranged in 8 rows and 8 columns Row1-8 and Col1-8 control 1-8led of row and column respectively. Rowx high level and coly low level, the corresponding LED lights in row X and column y are on.)