基于51单片机SHT11温湿度传感器检测程序(运用12864液晶显示)

/* 基于51单片机SHT11温湿度传感器检测程序*/#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 0x1e enum TEMP,HUMI;typedef union /定义共用同类型 unsigned int i;float f; 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*/void delay(int z) int x,y;for(x=z;x0;x-)for(y=125;y0;y-);/* 50us延时函数*/void delay_50us(uint t)uint j;for(;t0;t-)for(j=19;j0;j-);/* 50ms延时函数*/void delay_50ms(uint t)uint j;for(;t0;t-)for(j=6245;j0;j-);/* 12864液晶写指令*/void write_12864com(uchar com)lcdrs=0;lcdrw=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);/* 12864液晶初始化*/void init12864lcd(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);delay_50us(240);write_12864com(0x06);delay_50us(10);write_12864com(0x0c);delay_50us(10);/* 12864液晶显示函数*/void display1(void)uchar i;write_12864com(0x80);for(i=0;i18;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;i18;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;i8;i+) write_dat(table4i); delay_50us(1);/* 12864液晶显示函数*/void displaywendu(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); delay_50us(1);for(i=4;i5;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;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 else DATA=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;return error; /error=1 通讯错误/* SHT11读字节程序*/char s_read_byte(unsigned char ack) unsigned char i,val=0;DATA=1; /释放数据线for(i=0x80;i0;i=1) /高位为1，循环右移 SCK=1; if(DATA) val=(val|i); /读一位数据线的值 SCK=0; DATA=!ack; /如果是校验，读取完后结束通讯；SCK=1; _nop_();_nop_();_nop_(); /延时3us SCK=0; _nop_();_nop_();_nop_(); DATA=1; /释放数据线return val;/* 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=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;i9;i+) /DATA保持高，SCK时钟触发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 char mode) unsigned error=0;unsigned 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;i100)rh_true=100; /湿度最大修正if(rh_true0.1)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;/CRC init12864lcd();display1();display2();display3();s_connectionreset(); /启动连接复位while(1)error=0; /初始化error=0，即没有错误error+=s_measure(unsigned char*)&temp_val.i,&checksum,TEMP); /温度测量error+=s_measure(unsigned char*)&humi_val.i,&checksum,HUMI); /湿度测量 if(error!=0) s_connectionreset(); /如果发生错误，系统复位 else humi_val.f=(float)humi_val.i; /转换为浮点数 temp_val.f=(float)temp_val.i; /转换为浮点数 calc_sth10(&humi_val.f,&temp_val.f); /修正相对湿度及温度 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 wendu4=t