温湿度检测器DHT11程序及显示程序

1、附录1：#include <regx52.h>#include <intrins.h>#include "DHT11.H"#include "DHT11.C"unsigned char range4=55,75,10,30; /温湿度上下限初值unsigned char Humi_Temp_Tab8=6,9,0,0,7,8,0,0; /数码管显示初值unsigned char numt1=0; /T1中断计数标志unsigned char numt0=0;unsigned char code Tab_Seg10=0x3f,0x06

2、,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f; /数码管段码 0-9unsigned char code Tab_Dig8=0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe; /位选第一位到第八位unsigned char code units4=0x39,0x71,0x77,0x76; /单位C/F/RH/*/* 温湿度采集函数 */*/void getdata() if(start_DHT11() read_DHT11();if(check_sum()Humi_Temp_Tab0=DHT_data.DH_H/10;Humi_

3、Temp_Tab1=DHT_data.DH_H%10;Humi_Temp_Tab2=DHT_data.DH_L/10; /存储湿度数据if(flag = 0)Humi_Temp_Tab4=DHT_data.T_H/10;Humi_Temp_Tab5=DHT_data.T_H%10;Humi_Temp_Tab6=DHT_data.T_L/10; /存储摄氏温度数据elseHumi_Temp_Tab4=(9*DHT_data.T_H/5+32)/10;Humi_Temp_Tab5=(9*DHT_data.T_H/5+32)%10; Humi_Temp_Tab6=(18*DHT_data.T_H+3

4、20)%100%10; /存储华氏温度数据/*/* 主函数 */*/ void main() delay_ms(500); /先进行延时 等待进入稳定状态P0 = 0;P1 = 0x0C; /初始化P1口EA = 0;TR1 = 0;TR0 = 0;TMOD = 0x11; /设置定时器 T0和T1，且工作方式都为方式1TH1 = (65536-5000)/256;TL1 = (65536-5000)%256;TH0 = (65536-2000)/256;TL0 = (65536-2000)%256;/设定初值2msTR1 = 1;TR0 = 1;EA = 1;ET0 = 1; ET1 = 1

5、; /打开中断定时器T0和T1PT1 = 0;PT0 = 1; /强制设置优先级delay_ms(1000); while(1) if(DHT_data.DH_H<range0) /湿度小于下限bee = 0;delay_ms(100);bee = 1;delay_ms(100);if(DHT_data.DH_H>range1) /湿度大于上限bee = 0;delay_ms(100);bee = 1;delay_ms(100);if(DHT_data.T_H<range2) /温度小于下限bee = 0;delay_ms(10);bee = 1;delay_ms(10);i

6、f(DHT_data.T_H>range3) /温度大于上限bee = 0;delay_ms(10);bee = 1;delay_ms(10); /*/* 定时器T0中断 */*/void T0_timer() interrupt 1unsigned char KData = 0x00;TR0 = 0; /进入T0后将T0中断关闭TH0 = (65536-2000)/256;TL0 = (65536-2000)%256;switch(numt0)case 0:P0 = 0; Seg_ce = 1; Seg_ce = 0; /段选开关if(flag2 = 1)P0 = Tab_Segran

7、ge0/10; /显示湿度下限的十位elseP0 = Tab_SegHumi_Temp_Tab0; /显示读取的湿度的十位Seg_ce = 1; Seg_ce = 0;P0 = Tab_Dig0; /位选第一位Dig_ce = 1; Dig_ce = 0;numt0+;break;case 1:P0 = 0; Seg_ce = 1; Seg_ce = 0;if(flag2 = 1)P0 = Tab_Segrange0%10; /显示湿度下限的个位elseP0 = Tab_SegHumi_Temp_Tab1; /显示读取的湿度的个位Seg_ce = 1; Seg_ce = 0;P0 = Tab_

8、Dig1; /位选第二位Dig_ce = 1; Dig_ce = 0;numt0+;break;case 2:P0 = 0; Seg_ce = 1; Seg_ce = 0;if(flag2 = 1)P0 = Tab_Segrange1/10;/显示湿度上限的十位elseP0 = units2; /显示单位RSeg_ce = 1; Seg_ce = 0; P0 = Tab_Dig2; /位选第三位Dig_ce = 1; Dig_ce = 0;numt0+;break;case 3:P0 = 0; Seg_ce = 1; Seg_ce = 0;if(flag2 = 1)P0 = Tab_Segra

9、nge1%10; /显示湿度上限的个位elseP0 = units3; /显示单位H Seg_ce = 1; Seg_ce = 0;P0 = Tab_Dig3; /位选第四位 Dig_ce = 1; Dig_ce = 0;numt0+;break;case 4:P0 = 0; Seg_ce = 1; Seg_ce = 0; P0 = Tab_Dig4; /位选第五位，且同时拉低键盘第四行Dig_ce = 1; Dig_ce = 0;Key_ce = 0;KData = P0; /扫描键盘第四行switch(KData)case 0xfe: case 0xfd: case 0xfb: case

10、0xf7: default:break;while(KData != 0xff)KData = P0;Key_ce = 1; if(flag2 = 1)P0 = Tab_Segrange2/10;/显示温度下限的十位elseP0 = Tab_SegHumi_Temp_Tab4; /显示读取的温度的十位Seg_ce = 1; Seg_ce = 0;numt0+;break;case 5:P0 = 0; Seg_ce = 1; Seg_ce = 0;P0 = Tab_Dig5; /位选第六位，且同时拉低键盘第三行Dig_ce = 1; Dig_ce = 0;Key_ce = 0;KData = P

11、0;/扫描键盘第三行switch(KData)case 0xfe:if(range0<range1&&flag2=1) range0+;break; /湿度下限加case 0xfd:if(range1<90&&flag2=1) range1+;break; /湿度上限加case 0xfb:if(range2<range3&&flag2=1 range2+;break;/温度下限加 case 0xf7:if(range3<50&&flag2=1) range3+;break; /温度上限加default:br

12、eak;while(KData != 0xff)KData = P0;Key_ce = 1;if(flag2 = 1)P0 = Tab_Segrange2%10; /显示温度下限的个位elseP0 = Tab_SegHumi_Temp_Tab5-0x80; /显示读取温度的个位（带小数点的）Seg_ce = 1; Seg_ce = 0;numt0+;break;case 6:P0 = 0; Seg_ce = 1; Seg_ce = 0;P0 = Tab_Dig6; /位选第七位，且同时拉低键盘第二行Dig_ce = 1; Dig_ce = 0;Key_ce = 0;KData = P0;/扫描

13、键盘第二行switch(KData)case 0xfe:if(range0>20&&flag2=1) range0-;break; /湿度下限减case 0xfd:if(range0<range1&&flag2=1) range1-;break; /湿度上限减case 0xfb:if(range2>0&&flag2=1) range2-;break; /温度下限减case 0xf7:if(range2<range3&&flag2=1) range3-;break; /温度上限减default:break;w

14、hile(KData != 0xff)KData = P0;Key_ce = 1;if(flag2 = 1)P0 = Tab_Segrange3/10; /显示温度上限的十位elseP0 = Tab_SegHumi_Temp_Tab6; /显示读取温度的小数位的十位 Seg_ce = 1; Seg_ce = 0;numt0+;break;case 7:P0 = 0; Seg_ce = 1; Seg_ce = 0;P0 = Tab_Dig7; /位选第八位，且同时拉低键盘第一行 Dig_ce = 1; Dig_ce = 0;Key_ce = 0;KData = P0; /扫描键盘第一行switc

15、h(KData)case 0xfe:flag2 = flag2;TR1 = TR1;break; /进入和退出限制调整模式case 0xfd:flag = flag;break; /进行华氏摄氏温度的转换设置case 0xfb: case 0xf7: default:break;while(KData != 0xff)KData = P0;Key_ce = 1;if(flag = 0&&flag2 = 0)P0 = units0; /显示单位Celse if(flag = 1&&flag2 = 0)P0 = units1; /显示单位Felse if(flag2

16、 = 1)P0 = Tab_Segrange3%10; /显示温度上限的个位Seg_ce = 1; Seg_ce = 0;numt0 = 0;break;default:numt0 = 0;break;TR0 = 1;/打开T0 /*/* 定时器T1中断 */*/void T1_timer() interrupt 3TR1 = 0; /关闭T0TH1 = (65536-50000)/256;TL1 = (65536-50000)%256;if(numt1 = 25) getdata(); /采集数据numt1 = 0;elsenumt1+;TR1 = 1; /打开T0#ifndef _DHT1

17、1_h_#define _DHT11_h_#include <REGX52.H>/*/* 引 脚 定 义 */*/sbit DHT_bus = P20;/DHT11数据传输口sbit Key_ce=P13;/按键输出使能sbit Seg_ce=P10; /段选位sbit Dig_ce=P11; /位选位sbit bee = P21;/蜂鸣器控制口/*/* 函 数 声 明 */*/bit start_DHT11(void); /开始void read_DHT11(void); /读取void delay_20us(void); /20us延时void delay_ms(unsigne

18、d char m); /N ms延时bit check_sum(void); /和校验/*/* 宏 定 义 */*/#define HIGH 1#define LOW 0/*/* 变 量 定 义 */*/#define DHT_timeover 5 /高电平维持时间，用于识别“数据0”和“数据1”bit flag2 = 0;/设置调节上下限模式转换标志bit flag=0; /设置摄氏和华氏温度模式转换标志/*/* 结 构 体 */*/struct DHT_data unsigned char DH_H; /湿度整数 unsigned char DH_L; /湿度小数 unsigned cha

19、r T_H; /温度整数 unsigned char T_L; /温度小数 unsigned char Checksum; /校验和DHT_data;#endif#include "DHT11.h"#include <intrins.h>/*/* 开始 DHT11 温湿度计 */* 输入：无 */* 输出：应答标志 0：应答失败 1：应答成功 */*/bit start_DHT11(void) bit DHT_start; DHT_start = 0; DHT_bus = HIGH; DHT_bus = LOW; /拉低18ms以上 delay_ms(18);

20、TR0 = 0; DHT_bus = HIGH; delay_20us(); delay_20us(); /拉高2040us while(!DHT_bus) DHT_start = 1; /DHT应答，DHT拉低80us后拉高80us，然后开始传输数据 /数据(40bit)=8bit湿度整数+8bit湿度小数+8bit温度整数+8bit 温度小数+8bit校验和 while(DHT_bus); return(DHT_start); /应答成功返回1/*/* 读取 DHT11 温湿度计 */* 读取结果存在DHT_data结构体内 */* 输入：无 输出：无 */*/void read_DHT1

21、1(void) unsigned char m,n,timer_dht; unsigned char *p; p=&DHT_data.DH_H; /数据放在DHT_date的结构体中 for(m=0;m<5;m+) for(n=0;n<8;n+) while(DHT_bus); /DHT拉低12-14us表示1bit数据开始 timer_dht=0x00; while(DHT_bus) /随后DHT拉高总线，单片机通过高电 平维持的时间判断“数据0”还是“数据1” /数据0维持2628us高电平，数据1维持116118us高电平 timer_dht+; /由于此处对延时时间的 长度要求很高，所以采用另一种办法判断 if(timer_dht>DHT_