基于AT89C52的SHT10温度湿度检测设计 C语言 仿真成功

#include <reg52.h> #include <intrins.h> #include <math.h> #include <stdio.h> unsigned int wendu,shidu; unsigned char code table_h[20]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90, 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10}; unsigned char code table_l[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; sbit d1 = P3^1; sbit d2 = P3^2; sbit d3 = P3^3; sbit Sp = P1^7; #define uchar unsigned char #define uint unsigned int void LED_init(void); void LED_xianshi(void); void delay_n10us(uint n); void LED_init(void) { d1 = 1; d2 = 1; d3=1; P0=0xff; P2=0xff; } void LED_xianshi(void) { uint i; uchar a,b,c,u,v,w; for(i=0;i<51;i++) { P0 = 0xff; P2 = 0xff; delay_n10us(200); a = (wendu/10); b = (wendu%10); c = wendu-10*a-b; u = (shidu/10); v = (shidu%10); w = shidu-10*u-v; d1=1; P0 = table_h[a]; P2 = table_l[u]; delay_n10us(1000); d1 = 0; d2 = 1; P0 = table_h[b]&0x7f; P2 = table_l[v]&0x7f; delay_n10us(1000); d2 =0; d3 = 1; P0 = table_h[c]; P2 = table_l[w]; delay_n10us(1000); d3 = 0; } } void delay_n10us(uint n) { uint i; for(i=n;i>0;i--) { _nop_();_nop_();_nop_();_nop_();_nop_();_nop_(); } } sbit SCK = P1^1; sbit DATA = P1^0; typedef union { unsigned int i; float f; } value; enum {TEMP,HUMI}; #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 void s_transstart(void); void s_connectionreset(void); char s_write_byte(unsigned char value); char s_read_byte(unsigned char ack); char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode); void calc_dht10(float *p_humidity ,float *p_temperature); void s_transstart(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 s_connectionreset(void) { unsigned char i; DATA=1; SCK=0; for(i=0;i<9;i++) { SCK=1; SCK=0; } s_transstart(); } char s_write_byte(unsigned char value) { unsigned char i,error=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; error=DATA; _nop_();_nop_();_nop_(); SCK=0; DATA=1; return error; } char s_read_byte(unsigned char ack) { unsigned char i,val=0; DATA=1; for (i=0x80;i>0;i/=2) { SCK=1; if (DATA) val=(val | i); _nop_();_nop_();_nop_(); SCK=0; } if(ack==1)DATA=0; else DATA=1; _nop_();_nop_();_nop_(); SCK=1; _nop_();_nop_();_nop_(); SCK=0; _nop_();_nop_();_nop_(); DATA=1; return val; } char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode) { unsigned error=0; unsigned int i; s_transstart(); switch(mode){ case TEMP : error+=s_write_byte(MEASURE_TEMP); break; case HUMI : error+=s_write_byte(MEASURE_HUMI); break; default : break; } for (i=0;i<65535;i++) if(DATA==0) break; if(DATA) error+=1; *(p_value) =s_read_byte(ACK); *(p_value+1)=s_read_byte(ACK); *p_checksum =s_read_byte(noACK); return error; } void calc_dht10(float *p_humidity ,float *p_temperature) { const float C1=-4.0; const float C2=+0.0405; const float C3=-0.0000028; const float T1=+0.01; const float T2=+0.00008; float rh=*p_humidity; float t=*p_temperature; float rh_lin; float rh_true; float t_C; t_C=t*0.01 - 40; rh_lin=C3*rh*rh + C2*rh + C1; rh_true=(t_C-25)*(T1+T2*rh)+rh_lin; if(rh_true>99)rh_true=99; if(rh_true<0.1)rh_true=0.1; *p_temperature=t_C; *p_humidity=rh_true; } void main(void) { value humi_val,temp_val; unsigned char error,checksum; LED_init(); s_connectionreset(); while(1) { error=0; error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); if(error!=0) { P0 = 0x86; P2 = 0xc0; s_connectionreset(); } else { humi_val.f=(float)humi_val.i; temp_val.f=(float)temp_val.i; calc_dht10(&humi_val.f,&temp_val.f); wendu=temp_val.f ; shidu=humi_val.f; LED_xianshi(); if (wendu>40|wendu<0) { Sp=0; } } delay_n10us(1000); } }