led 点阵显示led——rom实现，功能模块分离 就爱可根据卡加大公开吉安市贷款给经济 -led dot matrix display led -- rom realized, functional modules can be separated on the basis love Cagayan open to the public Ji'an City loans to the economy

普通交通灯，可以设置初始倒计时时间，用矩阵键盘设置。内涵原理图。请用proteus 7.7或者更高版本打开-Ordinary traffic lights, can set the initial countdown time, using matrix keyboard Settings. Connotation principle diagram. Please use proteus 7.7 or higher version open