51单片机交通信号灯C语言程序

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51单片机交通信号灯C语言程序

89C52引脚图

1. #include<reg52.h>
   
2. #define uchar unsigned char
   
3. #define uint unsigned int
   
4. sbit RED_A=P0^0; //东西向灯
   
5. sbit YELLOW_A=P0^1;
   
6. sbit GREEN_A=P0^2;
   
7. sbit RED_B=P0^3; //南北向灯
   
8. sbit YELLOW_B=P0^4;
   
9. sbit GREEN_B=P0^5;
   
10. uchar Flash_Count=0,Operation_Type=1; //闪烁次数，操作类型变量
    
11. //延时
    
12. void DelayMS(uint x)
    
13. {
    
14. uchar i;
    
15. while(x--) for(i=0;i<120;i++);
    
16. }
    
17. //交通灯切换
    
18. void Traffic_Light()
    
19. {
    
20. switch(Operation_Type)
    
21. {
    
22. case 1: //东西向绿灯与南北向红灯亮
    
23. RED_A=1;YELLOW_A=1;GREEN_A=0;
    
24. RED_B=0;YELLOW_B=1;GREEN_B=1;
    
25. DelayMS(20000);
    
26. Operation_Type=2;
    
27. break;
    
28. case 2: //东西向黄灯闪烁，绿灯关闭
    
29. DelayMS(300);
    
30. YELLOW_A=~YELLOW_A;GREEN_A=0;
    
31. YELLOW_B=~YELLOW_B;RED_B=0;
    
32. if(++Flash_Count!=10) return; //闪烁 5 次
    
33. Flash_Count=0;
    
34. Operation_Type=3;
    
35. break;
    
36. case 3: //东西向红灯，南北向绿灯亮
    
37. RED_A=0;YELLOW_A=1;GREEN_A=1;
    
38. RED_B=1;YELLOW_B=1;GREEN_B=0;
    
39. DelayMS(20000);
    
40. Operation_Type=4;
    
41. break;
    
42. case 4: //南北向黄灯闪烁 5 次
    
43. DelayMS(300);
    
44. YELLOW_A=~YELLOW_A;RED_A=0;
    
45. YELLOW_B=~YELLOW_B;GREEN_B=0;
    
46. if(++Flash_Count!=10) return;
    
47. Flash_Count=0;
    
48. Operation_Type=1;
    
49. }
    
50. }
    
51. //主程序
    
52. void main()
    
53. {
    
54. while(1) Traffic_Light();
    
55. }

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