STC89C52单片机+DHT11构成的数字温度、湿度计程序.pdf

STC89C52单片机+DHT11构成的数字温度、湿度计程序

#includereg51.h

#includeintrins.h

typedefunsignedcharU8;

typedefunsignedintU16;

U8codetable[]={0xc0,0xf9,0xa4,0xb0,

0x99,0x92,0x82,0xf8,

0x80,0x90,0x88,0x83,

0xc6,0xa1};

sbitP2_0=P2^0;

U8U8FLAG,U8temp;

U8shidu_shi,shidu_ge,wendu_shi,wendu_ge;

U8

U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdat

a;

U8

U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_

data_L_temp,U8checkdata_temp;

U8U8comdata;

voidDelay(U16z)

{

U8x,y;

for(x=z;x0;x--)

for(y=110;y0;y--);

}

voidDelay_10us(void)

{

U8i;

i--;

i--;

i--;

i--;

i--;

i--;

}

voidCOM(void)

{

U8i;

for(i=0;i8;i++)

{

U8FLAG=2;

while((!P2_0)U8FLAG++);

Delay_10us();

Delay_10us();

Delay_10us();

U8temp=0;

if(P2_0)U8temp=1;

U8FLAG=2;

while((P2_0)U8FLAG++);

if(U8FLAG==1)break;

U8comdata=1;

U8comdata|=U8temp;

}

}

voiddisplay(U8shidu_shi,U8shidu_ge,U8wendu_shi,U8

wendu_ge)

{

P2=0xff;

P2=0xbf;

P0=table[shidu_shi];

Delay(5);

P2=0xff;

P2=0xdf;

P0=table[shidu_ge];

Delay(5);

P2=0xff;

P2=0xfb;

P0=table[wendu_shi];

Delay(5);

P2=0xff;

P2=0xfd;

P0=table[wendu_ge];

Delay(5);

}

voidRH(void)

{

P2_0=0;

Delay(34);

P2_0=1;

Delay_10us();

Delay_10us();

Delay_10us();

Delay_10us();

P2_0=1;

if(!P2_0)

{

U8FLAG=2;

while((!P2_0)U8FLAG++);

U8FLAG=2;

while((P2_0)U8FLAG++);

COM();

U8RH_data_H_temp=U8comdata;