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chương trình chính
#include <at89x51.h>
#include <regx51.h>
#include <stdio.h>
#include "D:\lo ap trung\code\lib\delay.h"
#include "D:\lo ap trung\code\DHT21\dht21.h"
#define TAT 0
#define SANG 1
#define OUT 1
#define IN 0
#define DHT_DATA P2_5
// khai bao ket noi voi lcd
#define LCD_DATA P0
sbit LCD_RS = P2^6;
sbit LCD_EN = P2^7;
//
sbit MODE=P2^4;
sbit TANG=P2^3;
sbit GIAM=P2^2;
sbit den_60w=P1^0; // tao nhiet do
sbit dong_co=P1^1; // dong co dao trung
sbit quat_hut=P1^2; // quat hut gio ra ngoai
sbit den_dao_trung=P1^3; // DENF BAOS DAO TRUNG
unsigned char temp1,temp2,temp3,huni1,huni2,huni3;
unsigned int doam,nhietdo;
char NHIET_DO,PHAY,do_am=0;doi_hien_thi=0;dem_hien_thi= 0;
char dem_xung;ND_D1=37;ND_D2=8;tinh_ngat=0;dem1=0;dem_p hut=0;dem_gio=0;dem_ngay=0;gio=0;phut=0;giay=0;DAT _PHUT=0;DAT_GIO=1;CHON=0;
//Ham tao tre
// KHAI BAOS LCD
void Lcd_Cmd(unsigned char cmd)
{
LCD_RS = 0; // dia chi con tro
LCD_DATA = cmd;
LCD_EN = 0;
LCD_EN = 1;
if(cmd<=0x02)
{
Delay_ms(2);
}
else
{
Delay_ms(1);
}
}
void Lcd_Chr_Cp(char c) // Current Position doc du lieu ra lcd
{
LCD_RS = 1;
LCD_DATA = c;
LCD_EN = 0;
LCD_EN = 1;
Delay_ms(1);
}
// Xuat ra man hinh LCD 1 ky tu, ngay tai vi tri dong row, cot col
void Lcd_Chr(unsigned char row, unsigned char col, char c)
{
unsigned char cmd;
// Di chuyen co tro den vi tri can thiet
cmd = (row==1?0x80:0xC0) + col - 1;
Lcd_Cmd(cmd);
// Xuat ky tu
Lcd_Chr_Cp(c);
}
void Lcd_Out_Cp(char *str)
{
unsigned char i = 0;
while(str[i]!=0)
{
Lcd_Chr_Cp(str[i]);
i++;
}
}
// xuat ra man hinh lcd 1 chuoi kys tu
void Lcd_Out(unsigned char row, unsigned char col, char *str)
{
unsigned char cmd;
// Di chuyen co tro den vi tri can thiet
cmd = (row==1?0x80:0xC0) + col - 1;
Lcd_Cmd(cmd);
Lcd_Out_Cp(str);
}
void Lcd_Init()
{
Lcd_Cmd(0x30);
Delay_ms(5);
Lcd_Cmd(0x30);
Delay_ms(1);
Lcd_Cmd(0x30);
Lcd_Cmd(0x38); // So dong hien thi la 2, font 5x8
Lcd_Cmd(0x01); // Xoa noi dung hien thi
Lcd_Cmd(0x0C); // Bat hien thi va tat con tro
}
// KET THUC KHAI BAO LCD
void hien_thi_dht21 (void)
{
temp1=nhietdo/100;
temp2=nhietdo%100/10;
temp3=nhietdo%10;
huni1=doam/100;
huni2=doam%100/10;
huni3=doam%10;
Lcd_Out(2,1,"NHIET DO: ");
Lcd_Chr_Cp(temp1 + 0x30);
Lcd_Chr_Cp(temp2 + 0x30);
Lcd_Chr_Cp(',');
Lcd_Chr_Cp(temp3 + 0x30);
Lcd_Out(2,16,"C");
Lcd_Out(1,3,"DO AM: ");
Lcd_Chr_Cp(huni1 + 0x30);
Lcd_Chr_Cp(huni2 + 0x30);
Lcd_Chr_Cp(',');
Lcd_Chr_Cp(huni3 + 0x30);
Lcd_Out(1,15,"% ");
}
// chuong trinh cho time
void time ()
{ if(tinh_ngat==11){P2_7=!P2_7;}
if(tinh_ngat==22)
{
//read_dht21(&nhietdo,&doam);
giay++;dem_hien_thi++;
if(dem_hien_thi==15){doi_hien_thi=1;}
if(dem_hien_thi==30){doi_hien_thi=0;dem_hien_thi=0 ;}
if(giay>=59){dem_phut++;phut++;giay=0;}
if(dem_phut>=59){dem_phut=0;}
if(phut>=59){dem_gio++;gio++;phut=0;}
if(dem_gio>=23){dem_gio=0;}
if(gio>=23){dem_ngay++;gio=0;}
if(tinh_ngat==22){tinh_ngat=0;}
}
}
void time0(void) interrupt 1 using 1 //ngat TIME 0
{ TR0=0;TF0=0;
tinh_ngat++;
TL0=0xb0;
TH0=0x3c;
time();
TR0=1;
}
// chuong trinh chinh
void main()
{
TMOD=0x01;
TL0=0xb0;
TH0=0x3c;
EA=1;
ET0=1;
TR0=1;
dong_co=1;
quat_hut=0;
den_60w=0;
Lcd_Init();
while(1)
{
if(read_dht21(&nhietdo,&doam))
{
hien_thi_dht21(); //Delay_ms(1);
}
///
}
}
chương trình dht21
#include "dht21.h"
void start (void)
{
DHT_DATA = OUT;
DHT_DATA = OUT;
delay_us(60);
DHT_DATA = 0;
Delay_ms(20);
DHT_DATA = OUT;
DHT_DATA = IN;
delay_us(60);
}
unsigned int check_respon(void)
{
if(DHT_DATA) return 0;
else
while(DHT_DATA); //cho cho chan DATA duoc keo xuong 0
delay_us(100);
if(DHT_DATA)
return 1;
else
return 0;
}
unsigned int read_dht21(unsigned int *temp,unsigned int *humi)
{
unsigned char buff[5]={0,0,0,0,0};
unsigned char ii,i,checksum;
EA=0;
start();
if(!check_respon())
return 0;
else
while(DHT_DATA); //doi DATA ve 0
//doc du lieu
for(i=0;i<5;i++)
{
for(ii=0;ii<8;ii++)
{
while(!DHT_DATA); //doi DATA len 1
delay_us(50);
if(DHT_DATA)
{
buff[i]|=(1<<(7-ii));
while(DHT_DATA); //doi DATA xuong 0
}
}
}
checksum=buff[0]+buff[1]+buff[2]+buff[3];
if(checksum!=buff[4]) return 0;
if(buff[2]&0x80)
*temp=buff[3];
else
*temp=buff[2]*256+buff[3];
*humi=buff[0]*256+buff[1];
return 1;
EA=1;
}
