使用AT89C51，8个LED发光二级管和4个按键，按第一个键发光二极管前后4个交替显示3次，然后在8个一起闪烁3次。按 第二个键发光二极管从右向左单个循环显示3次再一起闪烁3次。按第三个键发光二级管从左向右单个循环显示3次再一起闪烁3次。第四个键发光二级管从左向右再从右向左3次以后再一起闪烁3次。-Use AT89C51 8 LED light-emitting diode and four buttons, four alternating before and after pressing the first key light-emitting diode display three times, and then flashes 3 times 8. Press the second key light-emitting diodes from right to left a single cycle three times and then flashes 3 times together. Press the third light-emitting diode left to right, a single loop 3 times and then flashes 3 times together. The fourth key light-emitting diode from left to right and then from right to left later with flashes 3 times.