n in the study countdown. After the road traffic signal cybertron interrupt output or changes over to yellow dodges the control, the countdown ought to be able in the current signal phase closure time to demonstrate the black screen.РIn view of the above request, used the C language pile corresponding control software. Software design main flow as shown in Figure 8. The system can study the signal light time, the study black screen, demonstrates the corresponding countdown time in the corresponding signal bright time interval, when the yellow light is bright closes the demonstration. Can through dial the code switch choice different display mode. The interrupt pletes red, the green time time study function and demonstration countdown function . Interrupt subroutine flow chart like chart 9.
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