标题: 基于DS18B20的测温电路设计 [打印本页]
作者: meimei20062009    时间: 2023-8-21 10:33
标题: 基于DS18B20的测温电路设计
功能要求：温度实时检测测量
代码：
  1. #include <reg51.h>
  2. #define uchar unsigned char
  3. #define uint unsigned int
  4. sbit DQ=P2^4;
  5. unsigned char flag;
  6. uchar code scan[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
  7. uchar code table[13]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x40,0x39,0x00};
  8. uchar code ditab[16]={0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x04,0x05,0x06,0x06,0x07,0x08,0x08,0x09,0x09};
  9. uchar dispbuf[8];
  10. uchar temper[2];


  13. void delay(unsigned int us)
  14. {
  15. while(us--);
  16. }


  19. void reset(void)
  20. {
  21. uchar x=0;
  22. DQ=1;
  23. delay(8);
  24. DQ=0;
  25. delay(80);
  26. DQ=1;
  27. delay(14);
  28. x=DQ;
  29. delay(20);
  30. }


  33. uchar readbyte(void)
  34. {
  35. uchar i=0;
  36. uchar dat=0;
  37. for (i=8;i>0;i--)
  38. {
  39. DQ=0;
  40. dat>>=1;
  41. DQ=1;
  42. if(DQ)
  43. dat|=0x80;
  44. delay(4);
  45. }
  46. return(dat);
  47. }
  48. void writebyte(unsigned char dat)
  49. {
  50. uchar i=0;
  51. for (i=8;i>0;i--)
  52. {
  53. DQ=0;
  54. DQ=dat&0x01;
  55. delay(5);
  56. DQ=1;
  57. dat>>=1;
  58. }
  59. delay(4);
  60. }


  63. void readtemp(void)
  64. {
  65. uchar a=0,b=0;
  66. reset();
  67. writebyte(0xCC);
  68. writebyte(0x44);
  69. reset();
  70. writebyte(0xCC);
  71. writebyte(0xBE);
  72. a=readbyte();
  73. b=readbyte();
  74. if(b>0x0f)
  75. {
  76. if(a==0)
  77. b=~b+1;
  78. else b=~b;
  79. flag=10;
  80. }
  81. else flag=12;
  82. temper[0]=a&0x0f;
  83. a=a>>4;
  84. temper[1]=b<<4;
  85. temper[1]=temper[1]|a;
  86. }
  87. void scandisp()
  88. {
  89. unsigned char i,value;
  90. for (i=0;i<8;i++)
  91. {
  92. P3=0xff;
  93. value=table[dispbuf[i]];
  94. if(i==3)
  95. value|=0x80;
  96. P0=value;
  97. P3=scan[i];
  98. delay(50);
  99. }
  100. }


  103. void main()
  104. {
  105. uchar temp,temp1;
  106. while(1)
  107. {
  108. scandisp();
  109. readtemp();
  110. temp1=temper[0];
  111. temp=temper[1];
  112. dispbuf[4]=ditab[temp1];
  113. dispbuf[1]=temp/100;
  114. dispbuf[3]=temp%10;
  115. temp=temp/10;
  116. dispbuf[2]=temp%10;
  117. dispbuf[0]=flag;
  118. dispbuf[5]=11;
  119. }
  120. }
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仿真电路

仿真电路

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代码文件



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