AT89C52与SHT10和1602液晶测温湿度的程序.docx

1、AT89C52与SHT10和1602液晶测温湿度的程序/*端口定义* P1.0-SCK (SHT10) P1.1-DATA (SHT10) P0-DB0DB7 (LCD1602) P2.0-RS (LCD1602) P2.1-RW (LCD1602) P2.2-E (LCD1602)*/#include #include #include #include #include #include #define uchar unsigned char#define uint unsigned int/按键设置sbit TEM_UP = P12;sbit TEM_DOWN = P13;sbit HU

2、M_UP = P14;sbit HUM_DOWN = P15;sbit SHEZHI_ENTER = P16;sbit SHEZHI_EXIT = P17;float f_tem_up_value = 50.0;float f_tem_down_value = -30.0;float f_hum_up_value = 10.0;float f_hum_down_value = 100.0;/1602液晶端口定义 *sbit LcdRs= P20;sbit LcdRw= P21;sbit LcdEn= P22;sbit ACC0 = ACC0;sbit ACC7 = ACC7;uchar str

3、7;/向LCD写入命令或数据*#define LCD_COMMAND 0 / Command#define LCD_DATA 1 / Data#define LCD_CLEAR_SCREEN 0x01 / 清屏#define LCD_HOMING 0x02 / 光标返回原点/设置显示模式*#define LCD_SHOW 0x04 /显示开#define LCD_HIDE 0x00 /显示关 #define LCD_CURSOR 0x02 /显示光标#define LCD_NO_CURSOR 0x00 /无光标 #define LCD_FLASH 0x01 /光标闪动#define LCD_N

4、O_FLASH 0x00 /光标不闪动/设置输入模式*#define LCD_AC_UP 0x02#define LCD_AC_DOWN 0x00 / default#define LCD_MOVE 0x01 / 画面可平移#define LCD_NO_MOVE 0x00 /defaultunsigned char LCD_Wait(void);void LCD_Write(bit style, unsigned char input);/*1602液晶显示部分子程序*/void delay(uint z) uint x,y; for(x=z;x0;x-) for(y=110;y0;y-);v

5、oid LCD_Write(bit style, unsigned char input) LcdRs=style; P0=input; delay(5); LcdEn=1; delay(5); LcdEn=0; void LCD_SetDisplay(unsigned char DisplayMode) LCD_Write(LCD_COMMAND, 0x08|DisplayMode); void LCD_SetInput(unsigned char InputMode) LCD_Write(LCD_COMMAND, 0x04|InputMode);/初始化LCD*void LCD_Initi

6、al() LcdEn=0; LCD_Write(LCD_COMMAND,0x38); /8位数据端口,2行显示,5*7点阵 LCD_Write(LCD_COMMAND,0x38); LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR); /开启显示, 无光标 LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN); /清屏 LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE); /AC递增, 画面不动/液晶字符输入的位置*void GotoXY(unsigned char x, unsigned char y) if(y=0)

7、LCD_Write(LCD_COMMAND,0x80|x); if(y=1) LCD_Write(LCD_COMMAND,0x80|(x-0x40);/将字符输出到液晶显示void Print(unsigned char *str) while(*str!=0) LCD_Write(LCD_DATA,*str); str+; void zhuanhuan(float a)/浮点数转换成字符串函数 memset(str,0,sizeof(str); sprintf (str,%f, a); void welcome() LCD_Initial(); GotoXY(0,0); Print( Wel

8、come! ); GotoXY(0,1); Print( Code of sht10 ); delay(200);/*- ;模块名称:delay_n10us(); ;功 能:延时函数，延时约n个10us较精确的延时函数,_nop_()延时1us12M晶振;-*/void delay_n10us(uint n) /延时n个10us12M晶振 uint i; for(i=n;i0;i-) _nop_();_nop_();_nop_(); _nop_();_nop_();_nop_(); /*第一部分LCD1602设置 END*/*第二部分DHT90设置 START* sbit SCK = P10;

9、 /定义通讯时钟端口sbit DATA = P11; /定义通讯数据端口typedef union unsigned int i; /定义了两个共用体 float f; value; enum TEMP,HUMI; /TEMP=0,HUMI=1 #define noACK 0 /用于判断是否结束通讯#define ACK 1 /结束数据传输 /adr command r/w #define STATUS_REG_W 0x06 /000 0011 0 #define STATUS_REG_R 0x07 /000 0011 1 #define MEASURE_TEMP 0x03 /000 0001

10、 1 #define MEASURE_HUMI 0x05 /000 0010 1 #define RESET 0x1e /000 1111 0 /*定义函数*/void s_transstart(void); /启动传输函数void s_connectionreset(void); /连接复位函数char s_write_byte(unsigned char value);/DHT90写函数char s_read_byte(unsigned char ack); /DHT90读函数char s_measure(unsigned char *p_value, unsigned char *p_c

11、hecksum, unsigned char mode);/测量温湿度函数void calc_dht90(float *p_humidity ,float *p_temperature);/温湿度补偿/*- ;模块名称:s_transstart(); ;功 能:启动传输函数;-*/ void s_transstart(void) / generates a transmission start / _ _ / DATA: |_| / _ _ / SCK : _| |_| |_ DATA=1; SCK=0; /Initial state _nop_(); SCK=1; _nop_(); DATA

12、=0; _nop_(); SCK=0; _nop_();_nop_();_nop_(); SCK=1; _nop_(); DATA=1; _nop_(); SCK=0; /*- ;模块名称:s_connectionreset(); ;功 能:连接复位函数;-*/ void s_connectionreset(void) / communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart / _ _ / DATA: |_| / _ _ _ _ _ _ _ _ _ _ _ / SCK : _| |_

13、| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_ unsigned char i; DATA=1; SCK=0; /Initial state for(i=0;i0;i/=2) /shift bit for masking if (i & value) DATA=1; /masking value with i , write to SENSI-BUS else DATA=0; SCK=1; /clk for SENSI-BUS _nop_();_nop_();_nop_(); /pulswith approx. 3 us SCK=0; DATA=1; /rel

14、ease DATA-line SCK=1; /clk #9 for ack error=DATA; /check ack (DATA will be pulled down by DHT90),DATA在第9个上升沿将被DHT90自动下拉为低电平。 _nop_();_nop_();_nop_(); SCK=0; DATA=1; /release DATA-line return error; /error=1 in case of no acknowledge /返回：0成功，1失败 /*- ;模块名称:s_read_byte(); ;功 能:SHT10读函数;-*/ char s_read_

15、byte(unsigned char ack) / reads a byte form the Sensibus and gives an acknowledge in case of ack=1 unsigned char i,val=0; DATA=1; /release DATA-line for (i=0x80;i0;i/=2) /shift bit for masking SCK=1; /clk for SENSI-BUS if (DATA) val=(val | i); /read bit _nop_();_nop_();_nop_(); /pulswith approx. 3 u

16、s SCK=0; if(ack=1)DATA=0; /in case of ack=1 pull down DATA-Line else DATA=1; /如果是校验(ack=0)，读取完后结束通讯 _nop_();_nop_();_nop_(); /pulswith approx. 3 us SCK=1; /clk #9 for ack _nop_();_nop_();_nop_(); /pulswith approx. 3 us SCK=0; _nop_();_nop_();_nop_(); /pulswith approx. 3 us DATA=1; /release DATA-line

17、 return val; /*- ;模块名称:s_measure(); ;功 能:测量温湿度函数;-*/ char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode) / makes a measurement (humidity/temperature) with checksum unsigned error=0; unsigned int i; s_transstart(); /transmission start switch(mode) /send command to se

18、nsor case TEMP : error+=s_write_byte(MEASURE_TEMP); break; case HUMI : error+=s_write_byte(MEASURE_HUMI); break; default : break; for (i=0;i100)rh_true=100; /cut if the value is outside of if(rh_true0.1)rh_true=0.1; /the physical possible range *p_temperature=t_C; /return temperature C *p_humidity=r

19、h_true; /return humidity%RH/*主函数*void main(void) value humi_val,temp_val; unsigned char error,checksum; LcdRw=0; s_connectionreset(); welcome();/显示欢迎画面 delay(2000); LCD_Initial(); while(1) / shezhi(); error=0; error+=s_measure(unsigned char*) &humi_val.i,&checksum,HUMI); /measure humidity error+=s_m

20、easure(unsigned char*) &temp_val.i,&checksum,TEMP); /measure temperature if(error!=0) s_connectionreset(); /in case of an error: connection reset else humi_val.f=(float)humi_val.i; /converts integer to float temp_val.f=(float)temp_val.i; /converts integer to float calc_dht90(&humi_val.f,&temp_val.f); /计算湿度与温度 GotoXY(0,0);/ Print(Tep:); GotoXY(0,1); Print(Hum:); zhuanhuan(temp_val.f);/转换温度为uchar方便液晶显示