stc15w单片机 dht11

[yy802399yy]

利用stc15w单片机，采集dht11温湿度传感器读数，在数码管显示

[鱻鱼]

#include <STC15F2K60S2.H>
#include <intrins.h>
#include <math.h>
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={
0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f
};
sbit wela = P2^7;
sbit dula = P2^6;
sbit dht = P3^7;
uchar RH_data,RL_data,TH_data,TL_data,CK_data;
uchar undata;
void Delay35us() //@11.0592MHz
{
unsigned char i;

_nop_();
i = 94;
while (--i);
}
void Delay8us() //@11.0592MHz
{
unsigned char i;

_nop_();
_nop_();
i = 19;
while (--i);
}
void Delay800us() //@11.0592MHz
{
unsigned char i, j;

_nop_();
_nop_();
_nop_();
i = 9;
j = 151;
do
{
while (--j);
} while (--i);
}
void Delay30us() //@11.0592MHz
{
unsigned char i;

_nop_();
_nop_();
i = 80;
while (--i);
}
void Delay18ms() //@11.0592MHz
{
unsigned char i, j, k;

i = 1;
j = 194;
k = 160;
do
{
do
{
while (--k);
} while (--j);
} while (--i);
}
uchar read_8bit() //¶ÁÈ¡Ò»¸ö×Ö½Ú
{
uint i;
uchar temp = 0;
uchar dat;
for(i = 0;i < 8;i++)
{
while(!dht);
Delay30us();
temp = 0;
if(dht == 1)
{
temp = 1;
}
while(dht);
dat<<=1;
dat = dat|temp;
}
return dat;
}
uchar read_data()
{
uint i;
dht = 1;
Delay8us();
dht = 0;
Delay18ms();
dht = 1;
Delay35us();
if(!dht)
{
while(!dht);
while(dht);
RH_data = read_8bit();
RL_data = read_8bit();
TH_data = read_8bit();
TL_data = read_8bit();
CK_data = read_8bit();
undata = RH_data + RL_data + TH_data + TL_data;
}
if(CK_data == undata)
{
i = 1;
}
else
{
i = 0;
}
return i;
}
void main()
{
uchar i;
while(1)
{
i = read_data();
if(i == 1)
{
i = 0;
wela = 1;
P0=0xfe;
wela = 0;
dula = 1;
P0 = table[RH_data/10];
dula = 0;
Delay800us();

wela = 1;
P0=0xfd;
wela = 0;
dula = 1;
P0 = table[RH_data%10];
dula = 0;
Delay800us();

wela = 1;
P0=0xf7;
wela = 0;
dula = 1;
P0 = table[TH_data/10];
dula = 0;
Delay800us();

wela = 1;
P0=0xef;
wela = 0;
dula = 1;
P0 = table[TH_data%10];
dula = 0;
Delay800us();
}
}
}