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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：#include #include /* 宏定义*/#define uint unsigned int#define uchar unsigned char#define noACK 0#define ACK 1#define STATUS_REG_W 0x06#define STATUS_REG_R 0x07#define MEASURE_TEMP 0x03#define MEASURE_HUMI 0x05#define RESET 0x1eenumTEMP,HUMI
2、;typedefunion/定义共用同类型 unsignedinti; floatf; value;/*位定义*/sbit lcdrs=P20;sbit lcdrw=P21;sbit lcden=P22;sbit SCK = P10;sbit DATA = P11;/* 变量定义*/uchar table2=SHT11 温湿度检测;uchar table3=温度为： ;uchar table4=湿度为：;uchar table5=.;uchar wendu6;uchar shidu6;/* 1ms延时函数*/voiddelay(intz) intx,y; for(x=z;x0;x-) for(
3、y=125;y0;y-);/* 50us延时函数*/voiddelay_50us(uint t) uint j; for(;t0;t-) for(j=19;j0;j-);/* 50ms延时函数*/voiddelay_50ms(uint t) uint j; for(;t0;t-) for(j=6245;j0;j-);/* 12864液晶写指令*/voidwrite_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*/
4、voidwrite_dat(uchar dat) lcdrs=1; lcdrw=0; delay_50us(1); P0=dat; lcden=1; delay_50us(10); lcden=0; delay_50us(2); /* 12864液晶初始化*/voidinit12864lcd(void) delay_50ms(2); write_12864com(0x30); delay_50us(4); write_12864com(0x30); delay_50us(4); write_12864com(0x0f); delay_50us(4); write_12864com(0x01);
5、 delay_50us(240); write_12864com(0x06); delay_50us(10); write_12864com(0x0c); delay_50us(10); /* 12864液晶显示函数*/ voiddisplay1(void) uchar i; write_12864com(0x80); for(i=0;i18;i+) write_dat(table2i); delay_50us(1); /* 12864液晶显示函数*/ voiddisplay2(void) uchar i; write_12864com(0x90); for(i=0;i18;i+) write
6、_dat(table3i); delay_50us(1); /* 12864液晶显示函数*/ voiddisplay3(void) uchar i; write_12864com(0x88); for(i=0;i8;i+) write_dat(table4i); delay_50us(1); /* 12864液晶显示函数*/ voiddisplaywendu(void) uchar i; write_12864com(0x94); for(i=0;i3;i+) write_dat(wendui); delay_50us(1); for(i=0;i1;i+) write_dat(table5i)
7、; delay_50us(1); for(i=4;i5;i+) write_dat(wendui); delay_50us(1); /* 12864液晶显示函数*/voiddisplayshidu(void) uchar i; write_12864com(0x8C); for(i=0;i3;i+) write_dat(shidui); delay_50us(1); for(i=0;i1;i+) write_dat(table5i); delay_50us(1); for(i=4;i0;i=1)/高位为1，循环右移 if(i&value) DATA=1;/和要发送的数相与，结果为发送的位 elseDATA=0; SCK=1; _nop_();_nop_();_nop_();/延时3us SCK=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; returnerror;/error=1 通讯错误/* SHT11读字节程序*
