基于单片机SHT温湿度传感器检测程序

1、基于51单片机SHT1膈湿度传感器检测程 序（含电路图）卜面是原理图:J,2占 占.¥后了ALE.na,T.fii.3i«:> - F FUHInlnJFIIH-lwr川sluESJfQEKKK卜面是SHT11与MC旌接的典型电路:卜面是源代码:#include <reg52.h>#include <intrins.h>/*宏定义*/ #define uint unsigned int#define uchar unsigned char#define noACK 0#define ACK 1#define STATUS_REG_W 0x06#

2、define STATUS_REG_R 0x07#define MEASURE_TEMP 0x03#define MEASURE_HUMI 0x05#define RESET 0x1e enum?TEMP,HUMI;typedef?union? 定义共用同类型unsigned?int?i;float?f; value;I*?位定义*/ sbit lcdrs=P2A0;sbit lcdrw=P2A1;sbit lcden=P2A2;sbit SCK = P1A0;sbit DATA = PW1;/*变量定义*/uchar table2="SHT11温湿度检测”;uchar table3

3、=uchar table4=uchar table5=IIIIII II.温度为:湿度为:C"II.uchar wendu6;uchar shidu6;/*1ms延时函数*/ void?delay(int?z)(int?x,y;for(x=z;x>0;x-)for(y=125;y>0;y-);)/*50us延时函数*/ void?delay_50us(uint t)(uint j;for(;t>0;t-)for(j=19;j>0;j-);)/*50ms延时函数*/ void?delay_50ms(uint t)(.uint j;for(;t>0;t-)f

4、or(j=6245;j>0;j-);/*12864液晶写指令*/ void?write_12864com(uchar com)(.lcdrs=0;delay_50us(1);P0=com;lcden=1;delay_50us(10);lcden=0;delay_50us(2);/*12864液晶写数据*/void?write_dat(uchar dat)(.lcdrs=1;lcdrw=0;delay_50us(1);P0=dat;lcden=1;delay_50us(10);lcden=0;delay_50us(2);.I*12864液晶初始化*/ void?init12864lcd(v

5、oid)(delay_50ms(2);write_12864com(0x30);delay_50us(4);write_12864com(0x30);delay_50us(4);write_12864com(0x0f);delay_50us(4);write_12864com(0x01);delay_50us(240);write_12864com(0x06);delay_50us(10);write_12864com(0x0c);delay_50us(10);.I*12864液晶显示函数*/ void?display1(void)(uchar i;write_12864com(0x80);f

6、or(i=0;i<18;i+)(write_dat(table2i);delay_50us(1);/*12864液晶显示函数*/ void?display2(void)(uchar i;write_12864com(0x90);for(i=0;i<18;i+)(write_dat(table3i);delay_50us(1);./* 12864液晶显示函数*/ void?display3(void)(uchar i;write_12864com(0x88);for(i=0;i<8;i+)(write_dat(table4i);delay_50us(1);./*12864液晶显

7、示函数*/void?displaywendu(void)(uchar i;write_12864com(0x94);for(i=0;i<3;i+)(write_dat(wendui);delay_50us(1);.for(i=0;i<1;i+)(write_dat(table5i);delay_50us(1);for(i=4;i<5;i+)(write_dat(wendui);delay_50us(1);./*12864液晶显示函数*/ void?displayshidu(void)(uchar i;write_12864com(0x8C);for(i=0;i<3;i+

8、)(write_dat(shidui);delay_50us(1);.for(i=0;i<1;i+)(write_dat(table5i);delay_50us(1);.for(i=4;i<5;i+)(write_dat(shidui);delay_50us(1);)I*SHT11写字节程序*/char?s_write_byte(unsigned?char?value)(unsigned?char?i,error=0;for?(i=0x80;i>0;i>>=1)?/ 高位为 1,循环右移(if?(i&value) DATA=1;?/和要发送的数相与，结果为

9、发送的位else?DATA=0;SCK=1;_nop_();_nop_();_nop_();?/ 延时 3usSCK=0;)DATA=1;?/释放数据线SCK=1;error=DATA;?/检查应答信号，确认通讯正常_nop_();_nop_();_nop_();SCK=0;DATA=1;return?error;?/error=1通讯错误)/*SHT11读字节程序*/char?s_read_byte(unsigned?char?ack)( 一 一unsigned?char?i,val=0;DATA=1;?/释放数据线for(i=0x80;i>0;i>>=1)?/ 高位为 1

10、,循环右移(SCK=1;if(DATA) val=(val|i);?/读一位数据线的值SCK=0;)DATA=!ack;?SCK=1;_nop_();_nop_();_nop_();?/ 延时 3usSCK=0;_nop_();_nop_();_nop_();DATA=1;?/释放数据线 return?val;)I*SHT11启动传输*/ void?s_transstart(void)(.DATA=1; SCK=0;?/ 准备_nop_()；SCK=1;_nop_();DATA=0;_nop_();SCK=0;_nop_();_nop_();_nop_();SCK=1;_nop_();DATA

11、=1;_nop_();SCK=0;/*SHT11连接复位*/ void?s_connectionreset(void)(.unsigned?char?i;DATA=1; SCK=0;?/ 准备for(i=0;i<9;i+)?/DATA保持高，SCK寸钟触发9次，发送启动传输，通迅即复位(SCK=1;SCK=0;s_transstart();?/ 启动传输/*SHT11温湿度检测*/char?s_measure(unsigned?char?*p_value, unsigned?char?*p_checksum, unsigned?charmode)(unsigned error=0;uns

12、igned?int?i;s_transstart();?/ 启动传输switch(mode)?/选择发送命令(case?TEMP : error+=s_write_byte(MEASURE_TEMP);?break;? 测量温度 case?HUMI : error+=s_write_byte(MEASURE_HUMI);?break;?/测量湿度default?:?break;for?(i=0;i<65535;i+)?if(DATA=0)?break;?等待测量结束if(DATA) error+=1;?/如果长时间数据线没有拉低，说明测量错误*(p_value) =s_read_byte

13、(ACK);?/读第一个字节，高字节(MSB)*(P_value+1)=s_read_byte(ACK);?/ 读第二个字节，低字节(LSB)*p_checksum =s_read_byte(noACK);?/read CRC 校验码 return?error;?/ error=1 通讯错误/*SHT11温湿度值标度变换及温度补偿*/void?calc_sth10(float?*p_humidity ,float?*p_temperature)(一const?float?C1=-4.0;? 12位湿度精度 修正公式const?float?C2=+0.0405;? 12位湿度精度修正公式cons

14、t?float?C3=-0.0000028;? 12位湿度精度修正公式const?float?T1=+0.01;?/ 14位温度精度5V条件 修正公式const?float?T2=+0.00008;?/ 14 位温度精度5V条件 修正公式 float?rh=*p_humidity;?/ rh: 12 位湿度 float?t=*p_temperature;?/ t: 14位温度float?rh_lin;?/ rh_lin:湿度 linear 值float?rh_true;?/ rh_true:湿度 ture 值float?t_C;?/ t_C :温度 Ct_C=t*0.01 - 40;?/补偿温

15、度rh_lin=C3*rh*rh + C2*rh + C1;?/相对湿度非线性补偿rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;?/相对湿度对于温度依赖性补偿if(rh_true>100)rh_true=100;?/湿度最大修正if(rh_true<0.1)rh_true=0.1;?/湿度最小修正*p_temperature=t_C;?/返回温度结果*p_humidity=rh_true;?/返回湿度结果/*?主函数*/void?main(void) (unsigned?int?temp,humi;value humi_val,temp_val;?/定义两个

16、共同体，一个用于湿度，一个用于温度unsigned?char?error;?/ 用于检验是否出现错误unsigned?char?checksum;?/CRCinit12864lcd();display1();display2();display3();s_connectionreset();?/ 启动连接复位while(1)温度测湿度测error=0;?/ 初始化error=0 ,即没有错误error+=s_measure(unsigned?char*)&temp_val.i,&checksum,TEMP);?/县 里error+=s_measure(unsigned?char

17、*)&humi_val.i,&checksum,HUMI);?如果发生错误，系统复位鼻 单if(error!=0) s_connectionreset();?/else转换为浮点数转换为浮点数修正相对湿度及温度humi_val.f=(float)humi_val.i;?/temp_val.f=(float)temp_val.i;?/calc_sth10(&humi_val.f,&temp_val.f);?/temp=temp_val.f*10;humi=humi_val.f*10;wendu0=temp/1000+'0'?/温度百位wendu1=temp%1000/100+'0'?/温度十位?wendu2=temp%100/10+'0'?/ 温度个位wendu3=0x2E;? 小数点wen