Electronica

#define PIN RB7_bit
#define PIN_DIR TRISB7_bit
unsigned short hum, temp;
char Text[4];
//Pines de salida para el LCD
sbit LCD_RS at RD2_bit;
sbit LCD_EN at RD3_bit;
sbit LCD_D7 at RD7_bit;
sbit LCD_D6 at RD6_bit;
sbit LCD_D5 at RD5_bit;
sbit LCD_D4 at RD4_bit;
//Bits de configuración TRIS
sbit LCD_RS_Direction at TRISD2_bit;
sbit LCD_EN_Direction at TRISD3_bit;
sbit LCD_D7_Direction at TRISD7_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D4_Direction at TRISD4_bit;

unsigned char dht11_read_byte(){
  unsigned char i = 8, dht11_byte = 0;
  while(i--){
    while(!PIN);
    delay_us(40);
    if(PIN){
      dht11_byte |= (1<<i);
      while(PIN);
    }
  }
  return(dht11_byte);
}

void dht11_read(){
  PIN = 0;  //start signal
  PIN_DIR = 0;
  delay_ms(25);
  PIN = 1;
  delay_us(30);
  PIN_DIR = 1;
  while(PIN);  //check response
  while(!PIN);
  while(PIN);
  hum = dht11_read_byte();  //read data
  dht11_read_byte();
  temp = dht11_read_byte();
  dht11_read_byte();
  dht11_read_byte();
}

void main() {
  PIN_DIR = 1;  //configura el pin como ntrada
  PIN = 1;
  Lcd_Init();  //Inicio del LCD.
  Lcd_Cmd(_LCD_CURSOR_OFF);  //Borrado del cursor.
  Lcd_Out( 1, 1, "  Sensor DHT11");  //Impresión de texto.
  while(1){ //Bucle infinito.
    dht11_read(); //lectura de temperatura y humedad
    Lcd_Out( 2, 1, "T:");
    ByteToStr( temp, Text );
    Lcd_Out( 2, 3, Text);  //Impresión de temperatura
    Lcd_Chr_Cp(0xDF);  //Impresión de signo de grado
    Lcd_Chr_Cp('C');
    Lcd_Out( 2, 11, "H:");
    ByteToStr( hum, Text );
    Lcd_Out( 2, 13, Text);  //Impresión de humedad
    Lcd_Chr_Cp('%');
    delay_ms(2000);  //Retardo de 2 segundos.
  }
}

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