基于51单片机SHT11温湿度传感器检测程序

1、基于51单片机SHT11温湿度传感器检测程序（含电路图）卜面是原理图:21-43h7一AEk711舌dsfI口wfl.H.H.EE-112皿(0地!?.电EifR.M.卜面是SHT11与MC戊接的典型电路:2接口说明VdduC(master)GNDDATALSCK!_IVdd；2.4-5.5VSHT1x(slave)2典型应用电路net卜面是源代码:viewsourceprint?001.#include<reg52.h>002.#include<intrins.h>003.004*005.宏定义006.*/007.#defineuintunsignedint008.#

2、defineucharunsignedchar009.#definenoACK0010.#defineACK1011.#defineSTATUS_REG_W0x06012.#defineSTATUS_REG_R0x07013.#defineMEASURE_TEMP0x03014.#defineMEASUREHUMI0x05015.#defineRESET0x1e016.017.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.*

3、/029.sbitlcdrs=P2A0;030.sbitlcdrw=P2A1;031.sbitlcden=P2A2;032.sbitSCK=PW0;033.sbitDATA=PW1;034.035./*036.变量定义037.*/038.uchartable2="SHT11温湿度检测”039.uchartable3="温度为：C”;040.uchartable4="湿度为："041.uchartable5="."042.ucharwendu6;043.ucharshidu6;044.045./*046.1ms延时函数047.*/048

4、.voiddelay(intz)049.050.intx,y;051.for(x=z;x>0;x-)052.for(y=125;y>0;y-);053.054.055./*056.50us延时函数057.*/058.voiddelay_50us(uintt)059.060.uintj;061.for(;t>0;t-)062.for(j=19;j>0;j-);063.064.065./*066.50ms延时函数067.*/068.voiddelay_50ms(uintt)069.070.uintj;071.for(;t>0;t-)072.for(j=6245;j&g

5、t;0;j-);073.074.075./*076.12864液晶写指令078.voidwrite_12864com(ucharcom)077.*/079.080.lcdrs=0;081.lcdrw=0;082.delay_50us(1);083.P0=com;084.lcden=1;085.delay_50us(10);086.lcden=0;087.delay_50us(2);088.089.090./*091.12864液晶写数据092.*/093.voidwrite_dat(uchardat)094.095.lcdrs=1;096.lcdrw=0;097.delay_50us(1);0

6、98.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.voidinit128641cd(void)109.110. delay_50ms(2);111. whte_12864com(0x30);112. delay_50us(4);113. whte_12864com(0x30);114. delay_50us(4);115. write_12864com(0x0f);116. delay_50us(4);117. whte

7、_12864com(0x01);118. delay_50us(240);119. whte_12864com(0x06);120. delay_50us(10);121. whte_12864com(0x0c);122. delay_50us(10);123. 124.125./*126.12864液晶显示函数128.voiddisplay1(void)127.*/129.130. uchari;131. write_12864com(0x80);132. for(i=0;i<18;i+)133. 134. write_dat(table2i);135. delay_50us(1);1

8、36. 137. 138.139./*140.12864液晶显示函数141.*/142.voiddisplay2(void)143.144. uchari;145. write_12864com(0x90);146. for(i=0;i<18;i+)147. 148. write_dat(table3i);149. delay_50us(1);150. 151. 152.153./*154.12864液晶显示函数155.*/156.voiddisplay3(void)157.158. uchari;159. write_12864com(0x88);160. for(i=0;i<8

9、;i+)161. 162. write_dat(table4i);163. delay_50us(1);164. 165. 166.167./*168.12864液晶显示函数170.voiddisplaywendu(void)169.*/171.172. uchari;173. write_12864com(0x94);174. for(i=0;i<3;i+)175. (176. write_dat(wendui);177. delay_50us(1);178. 179. for(i=0;i<1;i+)180. (181. write_dat(table5i);182. delay

10、_50us(1);183. 184. for(i=4;i<5;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. uchari;198. write_12864com(0x8C);199. for(i=0;i<3;i+)200. (201. write_dat(shidui);202. delay_50us(1);203. 204. for(i=0;i<1;i+)20

11、5. (206. write_dat(table5i);207. delay_50us(1);208. 209. for(i=4;i<5;i+)210. (211. write_dat(shidui);212. delay_50us(1);213. 214. 215.216./*217.SHT11写字节程序218.*/219. chars_write_byte(unsignedcharvalue)220. (221. unsignedchari,error=0;222. for(i=0x80;i>0;i>>=1)/高位为1,循环右移223. (224. if(i&

12、;value)DATA=1;和要发送的数相与，结果为发送的位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. _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_by

13、te(unsignedcharack)243. (244. unsignedchari,val=0;245. DATA=1;释放数据线246. for(i=0x80;i>0;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. D

14、ATA=1;释放数据线258. returnval;259. 260.261./*262.SHT11启动传输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_();_nop_();274. SCK=1;275. _nop_();276. DATA=1;277. _nop_();278. SCK=0;279. 280.281.282./*283.SHT1

15、1连接复位284.*/285. voids_connectionreset(void)286. (287. unsignedchari;288. DATA=1;SCK=0;准备289. 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290. (291. SCK=1;292. SCK=0;293. 294. s_transstart();/启动传输295. 296.297./*298.SHT11温湿度检测300.chars_measure(unsignedchar*p_value,unsignedchar*p_checksum,unsigned

16、charmode)299.*/301.(302. unsignederror=0;303. unsignedinti;305. s_transstart();/启动传输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;/测量湿度310. default:break;311. 312. for(i=0;i<65535;i+)if(DATA=0)break;/等

17、待测量结束313. if(DATA)error+=1;/如果长时间数据线没有拉低，说明测量错误314. *(p_value)=s_read_byte(ACK);读第一个字节，高字节(MSB)315. *(p_value+1)=s_read_byte(ACK);/读第二个字节，低字节(LSB)316. *p_checksum=s_read_byte(noACK);/readCRC校验码317. returnerror;/error=1通讯错误318. 319./*320.SHT11温湿度值标度变换及温度补偿321.*/322.voidcalc_sth10(float*p_humidity,flo

18、at*p_temperature)323.324.constfloatC1=-4.0;/12位湿度精度修正公式325.constfloatC2=+0.0405;/12位湿度精度修正公式326.constfloatC3=-0.0000028;/12位湿度精度修正公式327.constfloatT1=+0.01;/14位温度精度5V条件修正公式328.constfloatT2=+0.00008;/14位温度精度5V条件修正公式329.330.floatrh=*p_humidity;/rh:12位湿度331.floatt=*p_temperature;/t:14位温度332.floatrh_lin;

19、/rh_lin:湿度linear值333.floatrh_true;/rh_true:湿度ture值334.floatt_C;/t_C:温度C335.336. t_C=t*0.01-40;/补偿温度337. rh_lin=C3*rh*rh+C2*rh+C1;/相对湿度非线性补偿338. rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;/相对湿度对于温度依赖性补偿339. if(rh_true>100)rh_true=100;/湿度最大修正340. if(rh_true<0.1)rh_true=0.1;/湿度最小修正341.342. *p_temperature

20、=t_C;/返回温度结果343. *p_humidity=rh_true;/返回湿度结果344.345./*346.主函数347.*/348.voidmain(void)349.(350. unsignedinttemp,humi;351. valuehumi_val,temp_val;/定义两个共同体，一个用于湿度，一个用于温度352. unsignedcharerror;/用于检验是否出现错误353. unsignedcharchecksum;/CRC354. init128641cd();355. display1();356. display2();357. display3();358. s_connectionreset();359. while(1)360. (361. error=0;/初始化error=0,362. error+=s_measure(unsigned温度测量一363. error+=s_measure(unsigned湿度测量一364. if(error!=0)s_connectionreset();365. else366. (367. humi_val.f=(float)humi_val.i;368. temp_val.f=(float)temp_val.i;369./启动连接复位即没有错误char*)