SHT11溫濕度傳感器的單片機驅動程序有成品圖

ID:140725 · 發表于 2017-3-5 23:56

SHT11是一個一體化的溫濕度傳感器.
下圖是SHT11溫度測量的結果：

下圖是SHT11濕度測量的結果：

SHT11測溫度的程序：

#include<reg51.h>
#include<intrins.h>
#include<math.h>
#define uchar unsigned char
#define uint unsigned int
sbit led1=P1^7;
sbit led2=P1^6;
sbit DATA=P1^1;
sbit SCK=P1^0;
#define noACK 0
#define ACK 1 //adr command r/w
#define STATUS_REG_W 0x06 //0000 0110
#define STATUS_REG_R 0x07 //0000 0111
#define MEASURE_TEMP 0x03 //0000 0011
#define MEASURE_HUMI 0x05 //0000 0101
#define RESET 0x1e //0001 1110
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={ 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar code table_dian[]={ 0xbf,0x86,0xdb,0xcf, 0xe6,0xed,0xfd,0x87, 0xff,0xef,0xf7,0xfc,0xb9,0xd1,0xf9,0xf1};
uchar error=0;
void delayms(uint z)
{
uint i,j;
for(i=z;i>0;i--)
for( j=110;j>0;j--);
}
//啟動時序
void transstart()
{
SCK=1;
_nop_();
DATA=0;
_nop_();
SCK=0;
_nop_();
_nop_();
_nop_();
SCK=1;
_nop_();
DATA=1;
_nop_();
SCK=0;
}
//寫入命令子函數
uchar write_byte(uchar value)
{
uchar i;
for(i=0x80;i>0;i=i/2)
{
if(i&value) DATA=1;
else DATA=0;
SCK=1;
_nop_();
_nop_();
_nop_();
SCK=0;
}
DATA=1;
SCK=1;
error=DATA;
SCK=0;
return error;
}
//從傳感器讀數據
uchar read_byte(bit ack)
{
uchar i,val=0;
DATA=1;
for(i=0x80;i>0;i=i/2)
{
SCK=1;
if(DATA) val=val|i;
SCK=0;
}
DATA=!ack;
SCK=1;
_nop_();
_nop_();
_nop_();
SCK=0;
DATA=1;
return val;
}
//
void connectionreset()
{
uchar i;
DATA=1;
SCK=0;
for(i=0;i<9;i++)
{
SCK=1;
SCK=0;
}
transstart();
}
//測量函數,溫度和濕度
uint measure()
{
uchar value_1,value_2;
uint tempvalue;
transstart();
error+=write_byte(MEASURE_TEMP);
if(error!=0) connectionreset();
else
{
while(DATA==1)
_nop_();
if(DATA==0)
{
value_1=read_byte(ACK);
value_2=read_byte(noACK);
tempvalue=value_2+value_1*256;
}
//轉換成 16 位的 int 型
else error=1;
}
return tempvalue;
}
//數碼管顯示函數
void display(float dis_value)
{
float value;
int qian,bai,shi,ge;
value=dis_value*100;
qian=(int)value/1000;
bai=(int)value%1000/100;
shi=(int)value%100/10;
ge=(int)value%10;
dula=1;
P0=table[qian];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delayms(3);
dula=1;
P0=table_dian[bai];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delayms(3);
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delayms(3);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xf7;
wela=0;
delayms(3);
wela=1;
P0=0xff;
wela=0;
}
//計算溫度值子函數
float calc_temp(uint tempvalue)
{
uchar i;
const float d1=-39.9;
const float d2=+0.01;
float temp_final;
tempvalue=tempvalue&0x3fff; //取出低 14 位
temp_final=d1+d2*((float)tempvalue);
for(i=100;i>0;i--)
display(temp_final);
return temp_final;
}
//主函數
void main()
{
float dis_tempvalue;
uint tempvalue;
while(1)
{
connectionreset();
error=0;
tempvalue=measure();
if(error==0)
{
led1=0;
delayms(200);
led1=1;
delayms(200);
dis_tempvalue=calc_temp(tempvalue);
}
else
{
continue;
}
}
}