Đo nhiệt độ và độ ẩm dùng DHT11 PIC16f887 hiển thị LCD

Đo nhiệt độ và độ ẩm dùng DHT11 PIC16f887 hiển thị LCD:

Nguồn: http://www.stm32vn.com/

#include <16f887.h>
//!#device ADC=10
#use delay (CLOCK = 4M)
#fuses INTRC_IO

#include <stdlib.h>
#include <lcd.c>
//!#include <lcd420.c>
//!#define LCD_ENABLE_PIN     PIN_D0
//!#define LCD_RS_PIN         PIN_D1
//!#define LCD_RW_PIN         PIN_D2
//!#define LCD_DATA_PORT      PORTD
//!#define LCD_TRIS_LOCATION  TRISD
#define Buzz   PIN_E0
#define UP     PIN_E1
#define DW     PIN_E2


#define DHT11_pin PIN_A0

unsigned char values[5];
const unsigned char symbols[8]=
{        
   0x07, 0x05, 0x05, 0x07, 0x00, 0x00, 0x00, 0x00
};
unsigned int16  Max;
//!int8 i;

void setup();
void DHT11_init();
unsigned char get_byte();
unsigned char get_data();
void lcd_symbols();
void Click_UP();
void Click_DW();


void main()
{
//!   set_tris_e(0xff);
//!   //set_tris_a(0x00);
//!   setup_adc_ports(NO_ANALOGS);
//!   setup_adc_ports(sAN5);
//!   setup_adc(ADC_CLOCK_INTERNAL);
//!  
  unsigned char state = 0;
  setup();
  lcd_init();
  set_tris_e(0b11111110);
  Max=65;
//!   lcd_gotoxy(1,2);
//!   printf(lcd_putc,"CAI DAT=%03Ld",Max);
//!   lcd_gotoxy(12,2); lcd_putc(223);
//!   lcd_gotoxy(13,2); lcd_putc("C");

  while(TRUE)
  {
     
    get_data();
     

              if(Max>values[0])   output_high(Buzz);
              else output_low(Buzz);
              lcd_gotoxy(1, 1);
              lcd_putc("Tmp/ C: ");
              lcd_gotoxy(5, 1);
              lcd_putc(0);
              lcd_gotoxy(1, 2);
              lcd_putc("R.H/ %: ");
              lcd_gotoxy(9, 1);
              printf(lcd_putc, "%3u.%03u ", values[2], values[3]);
              lcd_gotoxy(9, 2);
              printf(lcd_putc, "%3u.%03u ", values[0], values[1]);
              delay_ms(1000);
             
           
     
     delay_ms(1000);
  };
}

void setup()
{
  disable_interrupts(global);
  port_B_pullups(FALSE);
//!   setup_timer_0(T0_internal | T0_8_bit);
//!   set_timer0(0);
  DHT11_init();
  lcd_init();
  lcd_putc("\f");
  lcd_symbols();
}

void DHT11_init()
{
  output_float(DHT11_pin);
  delay_ms(1000);
}

unsigned char get_byte()
{
  unsigned char s = 0;
  unsigned char value = 0;

  for(s = 0; s < 8; s += 1)
  {
     value <<= 1;
     while(!input(DHT11_pin));
     delay_us(30);

     if(input(DHT11_pin))
     {
         value |= 1;
     }
     while(input(DHT11_pin));
  }
  return value;
}


unsigned char get_data()
{
  short chk = 0;
  unsigned char s = 0;
  unsigned char check_sum = 0;

  output_high(DHT11_pin);
  output_low(DHT11_pin);
  delay_ms(18);
  output_high(DHT11_pin);
  delay_us(26);
   
  chk = input(DHT11_pin);
  if(chk)
  {
     return 1;
  }
  delay_us(80);
   
  chk = input(DHT11_pin);
  if(!chk)
  {
     return 2;
  }
  delay_us(80);

  for(s = 0; s <= 4; s += 1)
  {
      values[s] = get_byte();
  }
 
  output_high(DHT11_pin);
   
  for(s = 0; s < 4; s += 1)
  {
      check_sum += values[s];
  }
   
  if(check_sum != values[4])
  {
     return 3;
  }
  else
  {
     return 0;
  }
}


void lcd_symbols()  
{
  unsigned char i = 0;              

  lcd_send_byte(0, 0x40);

  for(i = 0; i < 8; i++)
  {
       lcd_send_byte(1, symbols[i]);
  }
  lcd_send_byte(0, 0x80);
}


void Click_UP()
{
  if(input_state(UP)==0)
  {
     delay_ms(50);
     Max++;
     if(Max>=100)   Max=100; else;
     lcd_gotoxy(1,2);
     printf(lcd_putc,"CAI R.H=%03Ld",Max);
     while(input_state(UP)==0);
     delay_ms(50);
  }
}

void Click_DW()
{
  if(input_state(DW)==0)
  {
     delay_ms(50);
     Max--;
     if(Max<=0)   Max=0; else;
     lcd_gotoxy(1,2);
     printf(lcd_putc,"CAI R.H=%03Ld",Max);
     while(input_state(DW)==0);
     delay_ms(50);
  }
}