51单片机温度测量:
温度.rar
(42.82 KB, 下载次数: 117)
用查表法测热敏电阻的电压
源程序:
- #include "STC15F2K60S2.H"
- sbit SEL0=P2^0; //定义引脚
- sbit SEL1=P2^1;
- sbit SEL2=P2^2;
- sbit SEL3=P2^3;
- sbit beep=P3^4; //蜂鸣器引脚
- sbit s1=P4^1; //步进电机IO口
- sbit s2=P4^2;
- sbit s3=P4^3;
- sbit s4=P4^4;
- sbit key=P3^2; //开关按键
- #define uint unsigned int //宏定义
- #define ulint unsigned long
- uint value=0x00; //LED显示
- uint count=0;
- uint i=1; //步进电机
- bit flag=0; //开关
- uint time=0; //延时
- uint t=0; //执行温度的次数
- ulint sumt=0; //温度AD值的总和
- uint date_temp;
- int temp=0; //温度值
- uint abs_temp; //温度绝对值
- //设置用于显示温度的三个变量
- uint temp_bai=0; //百位
- uint temp_shi=0; //十位
- uint temp_ge =0; //个位
- //数码管上显示0-F
- char segtable[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
- //温度值对应表
- int code tempdata[]={239,197,175,160,150,142,135,129,124,120,116,113,109,107,104,101,
- 99, 97, 95, 93, 91, 90, 88, 86, 85, 84, 82, 81, 80, 78, 77, 76,
- 75, 74, 73, 72, 71, 70, 69, 68, 67, 67, 66, 65, 64, 63, 63, 62,
- 61, 61, 60, 59, 58, 58, 57, 57, 56, 55, 55, 54, 54, 53, 52, 52,
- 51, 51, 50, 50, 49, 49, 48, 48, 47, 47, 46, 46, 45, 45, 44, 44,
- 43, 43, 42, 42, 41, 41, 41, 40, 40, 39, 39, 38, 38, 38, 37, 37,
- 36, 36, 36, 35, 35, 34, 34, 34, 33, 33, 32, 32, 32, 31, 31, 31,
- 30, 30, 29, 29, 29, 28, 28, 28, 27, 27, 27, 26, 26, 26, 25, 25,
- 24, 24, 24, 23, 23, 23, 22, 22, 22, 21, 21, 21, 20, 20, 20, 19,
- 19, 19, 18, 18, 18, 17, 17, 16, 16, 16, 15, 15, 15, 14, 14, 14,
- 13, 13, 13, 12, 12, 12, 11, 11, 11, 10, 10, 9, 9, 9, 8, 8, 8, 7,
- 7, 7, 6, 6,5, 5, 54,4, 3, 3,3, 2, 2, 1, 1, 1, 0, 0, -1, -1, -1,
- -2, -2, -3, -3, -4, -4, -5, -5, -6, -6, -7, -7, -8, -8, -9, -9,
- -10, -10, -11, -11, -12, -13, -13, -14, -14, -15, -16, -16, -17,
- -18, -19, -19, -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
- -30, -32, -33, -35, -36, -38, -40, -43, -46, -50, -55, -63, 361};
- void Delay(int n); //延时函数
- void weixuan(char i); //数码管位的选择
- void SEG_Display(); //显示温度
- void InitADC_temp(); //初始化温度ADC
- void date_processtemp();
- void Delay(int n) //延时函数
- {
- while(n--);
- }
- void weixuan(char i) //数码管位的选择
- {
- SEL2=i/4;
- SEL1=i%4/2;
- SEL0=i%2;
- }
- void SEG_Display() //显示温度
- {
- //用于设置温度的位数
- SEL3=0; //数码管点亮
- if(temp<0)
- {
- P0=0;
- weixuan(5); //若温度为负,则首位显示‘-‘
- P0=0x40;
- Delay(500);
- }
- else
- {
- P0=0;
- weixuan(5);
- P0=segtable[temp_bai];
- Delay(500);
- }
-
- P0=0;
- weixuan(6);
- P0=segtable[temp_shi];
- Delay(500);
-
- P0=0;
- weixuan(7);
- P0=segtable[temp_ge];
- Delay(500);
-
- if(key==0)
- {
- Delay(15000); //延时10ms,按键消抖
- if(key==0)
- {
- while(key==0);
- flag=~flag;
- }
- }
-
- if(temp>30&&flag==0)
- {
- beep=~beep;
-
- switch(i++) //控制步进电机不同IO口脉冲电平
- {
- case 1: s1=1;s2=0;s3=0;s4=0;break;
- case 2: s1=0;s2=1;s3=0;s4=0;break;
- case 3: s1=0;s2=0;s3=1;s4=0;break;
- case 4: s1=0;s2=0;s3=0;s4=1;break;
- }
- if(i==5)
- i=1;
-
- count++;
- SEL3=1; //LED灯点亮
- P0=value; //LED发光
- Delay(500);
- if(count==30)
- {
- value=~value;
- count=0;
- }
- }
- }
- void T_L()
- {
- P0M1=0x00; //设置P0为推挽模式,点亮数码管
- P0M0=0xff;
- P2M1=0x00;
- P2M0=0x08; //将P2^3设置为推挽模式,其余为准双向口模式
- P3M1=0x00;
- P3M0=0x10; //设置P3^4为推挽模式
- SEL3=0; //熄灭LED灯
-
- IE=0xa8; //EA=1打开总中断,EADC=1允许A/D转化中断,ET1=1允许T1中断
- TMOD=0x10; //使用定时器1,16位不可重装载模式,TH1、TL1全用
- TH1=(65535-40000)/256;//高8位赋初值,定时40000周期
- TL1=(65535-40000)%256;//低8位赋初值
- TR1=1; //启动定时器1
- beep=0;
-
- while(1)
- {
- SEG_Display();
- }
- }
- void InitADC_temp() //初始化温度ADC
- {
- P1ASF=0xff; //将P1口作为模拟功能A/D使用
- ADC_RES=0; //寄存器ADC_RES和ADC_RESL保存A/D转化结果
- ADC_RESL=0; //初始赋值0
- ADC_CONTR=0x8b; //ADC_POWER=1打开A/D转换器电源;ADC_START=1启动模拟转换器ADC;CHS=011选择P1^3作为A/D输入使用
- CLK_DIV=0x20; //ADRJ=1:ADC_RES[1:0]存放高2位ADC结果,ADC_RESL[7:0]存放低8位ADC结果
- }
- //分别取出温度的百位、十位、个位
- void date_processtemp()
- {
- if(temp<0)
- abs_temp=-temp;
- else
- abs_temp=temp;
- temp_bai=abs_temp%1000/100;
- temp_shi=abs_temp%100/10;
- temp_ge =abs_temp%10;
- }
- void Timer1_Routine() interrupt 3 //3为定时器1中断编号
- {
- IE=0x00; //关闭总中断
- TR1=0; //定时器1停止
- TH1=(65535-40000)/256;//重新赋值
- TL1=(65535-40000)%256;
- InitADC_temp(); //初始化温度
- IE=0xa8; //打开总中断
- TR1=1; //启动定时器1
- }
- //AD中断
- void adc_isr() interrupt 5 using 1
- {
- time++;
- IE=0x00; //关闭中断
-
- if(time>2000) //取多次值求平均值减小误差
- {
- date_temp=(sumt+t/2)/t; //四舍五入
- temp=tempdata[date_temp-1]; //查找对应的AD的温度值
- sumt=0;
- t=0;
- time=0;
- date_processtemp();
- }
-
- //对应温度的数据处理
- t++;
- date_temp=(ADC_RES*256+ADC_RESL)/4;//由10位AD值转换为8位AD值
- sumt+=date_temp; //求t次AD值的和
- ADC_CONTR&=~0X10; //转换完成后,ADC_FLAG清零
- ADC_CONTR|=0X08; //转换完成后,ADC_START赋1
- IE=0xa8; //打开中断
- }
- void main()
- {
- T_L();
- }
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