基于51单片机SHT11温湿度传感器检测程序

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1、基于51单片机SHT11温湿度传感器检测程序(含电路图) 下面是原理图：下面是SHT11与MCU连接的典型电路：下面是源代码：view sourceprint?001.#include 002.#include 003.004./*005.宏定义006.*/007.#define uint unsigned int008.#define uchar unsigned char009.#define noACK 0010.#define ACK 1011.#define STATUS_REG_W 0x06012.#define STATUS_REG_R 0x07013.#define MEASU

2、RE_TEMP 0x03014.#define MEASURE_HUMI 0x05015.#define RESET 0x1e016.017.enumTEMP,HUMI;018.019.typedefunion/定义共用同类型020.021.unsignedinti;022.floatf;023. value;024.025.026./*027.位定义028.*/029.sbit lcdrs=P20;030.sbit lcdrw=P21;031.sbit lcden=P22;032.sbit SCK = P10;033.sbit DATA = P11;034.035./*036.变量定义037

3、.*/038.uchar table2=SHT11 温湿度检测;039.uchar table3=温度为： ;040.uchar table4=湿度为：;041.uchar table5=.;042.uchar wendu6;043.uchar shidu6;044.045./*046.1ms延时函数047.*/048.voiddelay(intz)049.050.intx,y;051.for(x=z;x0;x-)052.for(y=125;y0;y-);053.054.055./*056.50us延时函数057.*/058.voiddelay_50us(uint t)059.060.uint

4、 j;061.for(;t0;t-)062.for(j=19;j0;j-);063.064.065./*066.50ms延时函数067.*/068.voiddelay_50ms(uint t)069.070.uint j;071.for(;t0;t-)072.for(j=6245;j0;j-);073.074.075./*076.12864液晶写指令077.*/078.voidwrite_12864com(uchar com)079.080.lcdrs=0;081.lcdrw=0;082.delay_50us(1);083.P0=com;084.lcden=1;085.delay_50us(1

5、0);086.lcden=0;087.delay_50us(2);088.089.090./*091.12864液晶写数据092.*/093.voidwrite_dat(uchar dat)094.095.lcdrs=1;096.lcdrw=0;097.delay_50us(1);098.P0=dat;099.lcden=1;100.delay_50us(10);101.lcden=0;102.delay_50us(2);103.104.105./*106.12864液晶初始化107.*/108.voidinit12864lcd(void)109.110.delay_50ms(2);111.w

6、rite_12864com(0x30);112.delay_50us(4);113.write_12864com(0x30);114.delay_50us(4);115.write_12864com(0x0f);116.delay_50us(4);117.write_12864com(0x01);118.delay_50us(240);119.write_12864com(0x06);120.delay_50us(10);121.write_12864com(0x0c);122.delay_50us(10);123.124.125./*126.12864液晶显示函数127.*/128.void

7、display1(void)129.130.uchar i;131.write_12864com(0x80);132.for(i=0;i18;i+)133.134.write_dat(table2i);135.delay_50us(1);136.137.138.139./*140.12864液晶显示函数141.*/142.voiddisplay2(void)143.144.uchar i;145.write_12864com(0x90);146.for(i=0;i18;i+)147.148.write_dat(table3i);149.delay_50us(1);150.151.152.153

8、./*154.12864液晶显示函数155.*/156.voiddisplay3(void)157.158.uchar i;159.write_12864com(0x88);160.for(i=0;i8;i+)161.162.write_dat(table4i);163.delay_50us(1);164.165.166.167./*168.12864液晶显示函数169.*/170.voiddisplaywendu(void)171.172.uchar i;173.write_12864com(0x94);174.for(i=0;i3;i+)175.176.write_dat(wendui);

9、177.delay_50us(1);178.179.for(i=0;i1;i+)180.181.write_dat(table5i);182.delay_50us(1);183.184.for(i=4;i5;i+)185.186.write_dat(wendui);187.delay_50us(1);188.189.190.191.192./*193.12864液晶显示函数194.*/195.voiddisplayshidu(void)196.197.uchar i;198.write_12864com(0x8C);199.for(i=0;i3;i+)200.201.write_dat(shi

10、dui);202.delay_50us(1);203.204.for(i=0;i1;i+)205.206.write_dat(table5i);207.delay_50us(1);208.209.for(i=4;i0;i=1)/高位为1，循环右移223.224.if(i&value) DATA=1;/和要发送的数相与，成果为发送的位225.elseDATA=0;226.SCK=1;227._nop_();_nop_();_nop_();/延时3us228.SCK=0;229.230.DATA=1;/释放数据线231.SCK=1;232.error=DATA;/检查应答信号，确认通讯正常233.

11、_nop_();_nop_();_nop_();234.SCK=0;235.DATA=1;236.returnerror;/error=1 通讯错误237.238.239./*240.SHT11读字节程序241.*/242.chars_read_byte(unsignedcharack)243.244.unsignedchari,val=0;245.DATA=1;/释放数据线246.for(i=0x80;i0;i=1)/高位为1，循环右移247.248.SCK=1;249.if(DATA) val=(val|i);/读一位数据线的值250.SCK=0;251.252.DATA=!ack;/如果

12、是校验，读取完后结束通讯 ；253.SCK=1;254._nop_();_nop_();_nop_();/延时3us255.SCK=0;256._nop_();_nop_();_nop_();257.DATA=1;/释放数据线258.returnval;259.260.261./*262.SHT11启动传播263.*/264.voids_transstart(void)265.266.DATA=1; SCK=0;/准备267._nop_();268.SCK=1;269._nop_();270.DATA=0;271._nop_();272.SCK=0;273._nop_();_nop_();_n

13、op_();274.SCK=1;275._nop_();276.DATA=1;277._nop_();278.SCK=0;279.280.281.282./*283.SHT11连接复位284.*/285.voids_connectionreset(void)286.287.unsignedchari;288.DATA=1; SCK=0;/准备289.for(i=0;i9;i+)/DATA保持高，SCK时钟触发9次，发送启动传播，通迅即复位290.291.SCK=1;292.SCK=0;293.294.s_transstart();/启动传播295.296.297./*298.SHT11温湿度检

14、测299.*/300.chars_measure(unsignedchar*p_value, unsignedchar*p_checksum, unsignedcharmode)301.302.unsigned error=0;303.unsignedinti;304.305.s_transstart();/启动传播306.switch(mode)/选择发送命令307.308.caseTEMP : error+=s_write_byte(MEASURE_TEMP);break;/测量温度309.caseHUMI : error+=s_write_byte(MEASURE_HUMI);break

15、;/测量湿度310.default:break;311.312.for(i=0;i100)rh_true=100;/湿度最大修正340.if(rh_true0.1)rh_true=0.1;/湿度最小修正341.342.*p_temperature=t_C;/返回温度成果343.*p_humidity=rh_true;/返回湿度成果344.345./*346.主函数347.*/348.voidmain(void)349.350.unsignedinttemp,humi;351.value humi_val,temp_val;/定义两个共同体，一种用于湿度，一种用于温度352.unsignedch

16、arerror;/用于检查与否浮现错误353.unsignedcharchecksum;/CRC354.init12864lcd();355.display1();356.display2();357.display3();358.s_connectionreset();/启动连接复位359.while(1)360.361.error=0;/初始化error=0，即没有错误362.error+=s_measure(unsignedchar*)&temp_val.i,&checksum,TEMP);/温度测量363.error+=s_measure(unsignedchar*)&humi_val

17、.i,&checksum,HUMI);/湿度测量364.if(error!=0) s_connectionreset();/如果发生错误，系统复位365.else366.367.humi_val.f=(float)humi_val.i;/转换为浮点数368.temp_val.f=(float)temp_val.i;/转换为浮点数369.calc_sth10(&humi_val.f,&temp_val.f);/修正相对湿度及温度370.temp=temp_val.f*10;371.humi=humi_val.f*10;372.wendu0=temp/1000+0;/温度百位373.wendu1=

18、temp%1000/100+0;/温度十位374.wendu2=temp%100/10+0;/温度个位375.wendu3=0x2E;/小数点376.wendu4=temp%10+0;/温度小数点后第一位377.displaywendu();378.shidu0=humi/1000+0;/湿度百位379.shidu1=humi%1000/100+0;/湿度十位380.shidu2=humi%100/10+0;/湿度个位381.shidu3=0x2E;/小数点382.shidu4=humi%10+0;/湿度小数点后第一位383.displayshidu();384.385.delay(800);/等待足够长的时间，以现行下一次转换386.387.有关手册资料及源码下载地址：基于51单片机SHT11温湿度传感器检测程序有关资料