基于单片机和SHT11的温度/湿度检测系统

#include <reg52.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int #define TEMP_ML 0x03 #define HUMI_ML 0x05 uchar Busy_Check(); void Initialize_LCD(); void Write_LCD_Data(uchar dat); void Write_LCD_Command(uchar cmd); void Display_String(uchar x,uchar y,uchar *str); uchar ack,temp_h,temp_l; uint xianshi_t=0; uint xianshi_h=0; sbit SCK=P1^0; sbit DATA =P1^1; uchar current_temp_buffer[]={"HUMI: "}; uchar current_temp_buffer1[]={"TEMP: "}; void Delay_Us(int x) { uchar i; while(x--) for(i=0;i<200;i++); } char read() { unsigned char i,val=0; temp_l=0; temp_h=0; DATA=1; for (i=0x80;i>0;i/=2) { SCK=1; if (DATA) val=(val|i); SCK=0; } DATA=0; SCK=1; _nop_(); _nop_(); _nop_(); SCK=0; DATA=1; temp_h=val; val=0; DATA=1; for (i=0x80;i>0;i/=2) { SCK=1; if (DATA) val=(val | i); SCK=0; } DATA=1; SCK=1; _nop_(); _nop_(); _nop_(); SCK=0; DATA=1; temp_l=val; } char write(uchar value) { uchar i ; ack=0; for (i=0x80;i>0;i/=2) { if (i & value) DATA=1; else DATA=0; SCK=1; _nop_(); _nop_(); _nop_(); SCK=0; } DATA=1; SCK=1; if (DATA==1) ack=1; SCK=0; return ack; } void start_sht11(void) { DATA=1; SCK=0; _nop_(); SCK=1; _nop_(); DATA=0; _nop_ (); SCK=0; _nop_(); _nop_(); _nop_(); SCK=1; _nop_(); DATA=1; _nop_(); SCK=0; } void sht_rest() { uchar i; DATA=1; SCK=0; for(i=0;i<10;i++) { SCK=1; SCK=0; } start_sht11(); } text_a(uchar ml) { uint i; write(ml); if (ack==1) { sht_rest(); write(ml); } for (i=0;i<55535;i++) { if(DATA==0) break; } read(); } text_jishuan_temp11() { ack=0; sht_rest(); text_a(TEMP_ML); text_jishuan_temp(); LCD_Display(); text_a(HUMI_ML); text_jishuan_humi(); LCD_Display(); } text_jishuan_temp() { float a=0,temp; a=(float)temp_h*256+(float)temp_l; temp=0.01*a-39; if (temp<0) { temp=0; } xianshi_t=(int)temp; } text_jishuan_humi() { float a=0,b=0,humi; a=(float)temp_h*256+(float)temp_l; b=a*a*2.8/1000000; a=0.0405*a; a=a-6-b; humi=a; xianshi_h=(int)humi; } LCD_Display() { Delay_Us(100); current_temp_buffer[6]=xianshi_h/10+'0'; current_temp_buffer[7]=xianshi_h%10+'0'; current_temp_buffer1[6]=xianshi_t/10+'0'; current_temp_buffer1[7]=xianshi_t%10+'0'; Delay_Us(100); Display_String(0,0,current_temp_buffer); Display_String(0,1,current_temp_buffer1); } main() { Initialize_LCD(); Delay_Us(100); while(1) { text_jishuan_temp11(); } }