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請(qǐng)問是因?yàn)闆]采集到數(shù)據(jù)嗎，還是時(shí)序問題呀 純小白QAQ
DHT11代碼：
#include"reg52.h"
#include"DHT11.h"
#include"delay.h"
#include <intrins.h>
sbit DHT11_DQ=P3^7;
bit status;
void delay_10us(unsigned int nus)
{
unsigned char i;
i = 2*nus;
while (--i);
}
void DHT11_Rst(void)
{
DHT11_DQ=0;
delay_ms(20);
DHT11_DQ=1;
delay_10us(4);
}
bit DHT11_Check(void)
{
unsigned char retry=0;
while(DHT11_DQ&&retry<100)
{
retry++;
delay_10us(1);
};
if(retry>=100)return 1;
else retry=0;
while(!DHT11_DQ&&retry<100)
{
retry++;
delay_10us(1);
};
if(retry>=100)return 1;
return 0;
}
bit DHT11_Init(void)
{
DHT11_Rst() ;
return DHT11_Check();
}
static unsigned char DHT11_Read_Byte(void)
{
unsigned char retry, dat = 0, i;
status = OK;
for(i = 8; i > 0; i--)
{
dat <<= 1;
retry = 0;
whileT11_DQ == 0 && retry++ < NUMBER);
if(retry >= NUMBER)
{
status = ERROR;
return 0;
}
delay_10us(2);
if(DHT11_DQ != 0)
{
dat++;
while(DHT11_DQ != 0 && retry++ < NUMBER)
{
DHT11_DQ = 1;
}
if(retry >= NUMBER)
{
status = ERROR;
return 0;
}
}
}
return (dat);
bit DHT11_Read_Date(unsigned char *temp,unsigned char *humi)
{
unsigned char i = 0,retry = 0;
unsigned char buf[SIZE];
DHT11_DQ = 0;
delay_ms(30);
DHT11_DQ = 1;
delay_10us(3);
if(DHT11_DQ != 0)
{
//??ó|′eD?o?
return ERROR;
}
else
{
while(DHT11_DQ == 0 && retry++ < NUMBER);
if(retry >= NUMBER)
{
DHT11_DQ = 1;
return ERROR;
}
retry = 0;
DHT11_DQ = 1;
while(DHT11_DQ != 0 && retry++ < NUMBER);
if(retry >= NUMBER)
{
DHT11_DQ = 1;
return ERROR;
}
for(i = 0; i < SIZE; i++)
{
buf[ i] = DHT11_Read_Byte();
if(status == ERROR)
{
DHT11_DQ = 1;
return ERROR;
}
}
if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4])
{
*humi = buf[0];
*temp = buf[2];
DHT11_DQ = 1;
return OK;
}
else
{
return ERROR;
}
}
}
主函數(shù)
void main()
{
unsigned char temperature;
unsigned char humidity;
Time0_Time1_init();
lcd1602_init();
led= 1;
delay_ms(1000);
L1602_string(1,1,"WD:");
L1602_string(1,8,"SD:");
L1602_string(1,6,"C");
L1602_string(1,13,"%");
L1602_string(2,3,":");
L1602_string(2,6,":");
L1602_string(2,12,":");
while(1)
{
DHT11_Read_Date(&temperature,&humidity);
delay_ms(50);
L1602_int(1,4,temperature);
L1602_int(1,11,humidity);
if(key1==0
{
buf++;
if(buf>1) buf=0;
}
if(buf==0
{
L1602_string(1,15,"SD");
if(key2==0) led=~led;
if(key3==0) q1=~q1;
if(key4==0) q2=~q2;
if(temperature>40) q2=1;
}
if(buf==1
{
L1602_string(1,15,"ZD");
if(key4==0) miao++;
if(key5==0) fen++;
if(key6==0) shi++;
if(key3==0) shi1++; if(shi1>23) shi1=0;
if(key2==0) fen1++; if(fen1>59) fen1=0;
if((shi==shi1)&(fen==fen1)
{
if(humidity>70) led=q1=q2=0;
}
if(temperature>40|humidity<35
led=q1=q2=1;
}
L1602_int(2,1,shi);
L1602_int(2,4,fen);
L1602_int(2,7,miao);
L1602_int(2,10,shi1);
L1602_int(2,13,fen1);
delay_ms(150);
}
}
void Timer0() interrupt 1
{
TH0=(65536-50000)/256；
TL0=(65536-50000)%256；
count++；
if(count==20
{
count=0
miao++;
if(miao>59)
{
miao=0;
fen++;
}
if(fen>59)
{
fen=0;
shi++;
}
if(shi>23) shi=0;
}
}
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