Introduction - If you have any usage issues, please Google them yourself
The circuit through digital tube display experiment, given a combination of experimental light water experiments to simulate the traffic light control system, including two group of six digital tube divided into three groups, representing the three junctions, light-emitting diodes P0.0 ~~ P0. 7, P2.7 nine light-emitting diode is divided into three groups, respectively, corresponding to the three intersections. So timed 30s three junctions to control vehicle traffic lights bright and dark.