Etepic

#define LCD_RS_PIN PIN_B0#define LCD_RW_PIN PIN_B1#define LCD_ENABLE_PIN PIN_B2#define LCD_DATA4 PIN_B3#define LCD_DATA5 PIN_B4#define LCD_DATA6 PIN_B5#define LCD_DATA7 PIN_B6//End LCD module connections#include <16F716.h>#FUSES NOWDT                    //No Watch Dog Ti 8 P#FUSES HS                 //Internal RC Osc, no CLKOUT#FUSES NOPROTECT                //Code not protected from reading//#FUSES NOBROWNOUT               //No brownout reset#FUSES NOPUT                    //No Power Up Timer//#FUSES NOCPD                    //No EE protection//#FUSES STVREN                   //Stack full/underflow will cause reset//#FUSES NODEBUG                  //No Debug mode for ICD//#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O//#FUSES NOWRT                    //Program memory not write protected//#FUSES IESO                     //Internal External Switch Over mode enabled//#FUSES FCMEN                    //Fail-safe clock monitor enabled//#FUSES MCLR                     //Master Clear pin enabled#use delay(CLOCK=8000000)#include <lcd.c>#use fast_io(A)// Connection pin between PIC16F84A and DHT22 sensor#BIT Data_Pin = 0x05.0                      // Pin mapped to PORTA.0#BIT Data_Pin_Direction = 0x85.0             // Pin direction mapped to TRISA.0char message1[] = "Temp = 00.0 C";char message2[] = "RH   = 00.0 %";short Time_out ;unsigned int8 T_byte1, T_byte2, RH_byte1, RH_byte2, CheckSum ;unsigned int16 Temp, RH;void start_signal(){  Data_Pin_Direction = 0;              // Configure connection pin as output  Data_Pin = 0;                        // Connection pin output low  delay_ms(25);  Data_Pin = 1;                        // Connection pin output high  delay_us(30);  Data_Pin_Direction = 1;              // Configure connection pin as input}short check_response(){  delay_us(40);  if(!Data_Pin){                     // Read and test if connection pin is low    delay_us(80);    if(Data_Pin){                    // Read and test if connection pin is high      delay_us(50);      return 1;}    }}unsigned int8 Read_Data(){  unsigned int8 i, k, _data = 0;     // k is used to count 1 bit reading duration  if(Time_out)    break;  for(i = 0; i < 8; i++){    k = 0;    while(!Data_Pin){                          // Wait until pin goes high      k++;      if (k > 100) {Time_out = 1; break;}      delay_us(1);}    delay_us(30);    if(!Data_Pin)      bit_clear(_data, (7 - i));               // Clear bit (7 - i)    else{      bit_set(_data, (7 - i));                 // Set bit (7 - i)      while(Data_Pin){                         // Wait until pin goes low      k++;      if (k > 100) {Time_out = 1; break;}      delay_us(1);}    }  }  return _data;}void main(){  lcd_init();                                 // Initialize LCD module  lcd_putc('\f');                             // LCD clear   while(TRUE){      delay_ms(1000);    Time_out = 0;    Start_signal();    if(check_response()){                    // If there is response from sensor      RH_byte1 = Read_Data();                 // read RH byte1      RH_byte2 = Read_Data();                 // read RH byte2      T_byte1 = Read_Data();                  // read T byte1      T_byte2 = Read_Data();                  // read T byte2      Checksum = Read_Data();                 // read checksum      if(Time_out){                           // If reading takes long time        lcd_putc('\f');                       // LCD clear        lcd_gotoxy(5, 1);                     // Go to column 5 row 1        lcd_putc("Time out!");      }      else{       if(CheckSum == ((RH_Byte1 + RH_Byte2 + T_Byte1 + T_Byte2) & 0xFF)){        RH = RH_byte1;        RH = (RH << 8) | RH_byte2;        Temp = T_byte1;        Temp = (Temp << 8) | T_byte2;        if (Temp > 0x8000){         message1[6] = '-';         Temp = Temp & 0x7FFF; }        else         message1[6] = ' ';        message1[7]  = (Temp / 100) % 10  + 48;        message1[8]  = (Temp / 10) % 10  + 48;        message1[10] = Temp % 10  + 48;        message2[7]  = (RH / 100) % 10 + 48;        message2[8]  = (RH / 10) % 10 + 48;        message2[10] = RH % 10 + 48;        message1[11] = 223;                   // Degree symbol        lcd_putc('\f');                       // LCD clear            lcd_gotoxy(1, 1);                     // Go to column 1 row 1        printf(lcd_putc, message1);           // Display message1        lcd_gotoxy(1, 2);                     // Go to column 1 row 2        printf(lcd_putc, message2);           // Display message2       }        else {          lcd_putc('\f');                     // LCD clear          lcd_gotoxy(1, 1);                   // Go to column 1 row 1          lcd_putc("Checksum Error!");        }      }    }    else {      lcd_putc('\f');             // LCD clear      lcd_gotoxy(3, 1);           // Go to column 3 row 1      lcd_putc("No response");      lcd_gotoxy(1, 2);           // Go to column 1 row 2      lcd_putc("from the sensor");    }  }  }