// Lcd pinout settings
   sbit LCD_RS at RB2_bit;
   sbit LCD_EN at RB3_bit;
   sbit LCD_D4 at RB4_bit;
   sbit LCD_D5 at RB5_bit;
   sbit LCD_D6 at RB6_bit;
   sbit LCD_D7 at RB7_bit;

   // Pin direction
   sbit LCD_RS_Direction at TRISB2_bit;
   sbit LCD_EN_Direction at TRISB3_bit;
   sbit LCD_D4_Direction at TRISB4_bit;
   sbit LCD_D5_Direction at TRISB5_bit;
   sbit LCD_D6_Direction at TRISB6_bit;
   sbit LCD_D7_Direction at TRISB7_bit;

void main()
  {
   // variables
   float temp , act_temp , duty;
   char disp[10], duty1 [5];
   int i = 0 , flag = 0;

   trisa = 1; trisb = 0; trisc = 0; trisd = 1; trise = 0;
   porta = 0; portb = 0; portc = 0; portd = 0; porte = 0;

   adcon1= 0b11011110 ;  //initialize A0 as analog input

   // LCD instruction
   Lcd_Init();
   Lcd_cmd(_Lcd_cursor_off);
   Lcd_out( 1, 1, "temp = ");

   PWM1_Init(5000); //initialise PWM1 at 5KHz

   while(1)  // start infinit loop
    {
     // temperature reading & calculation
     temp = ADC_Read(0);
     act_temp = (temp * 500) / 1024;
     floattostr(act_temp, disp); //converting float to char

     Lcd_out(1, 8,disp);
     
     portc.f0 = 1;   //signal to motor forward direction

     // PWM orders
     if (act_temp == 25 && act_temp <30 )
       {PWM1_Start(); PWM1_Set_Duty(32);  Lcd_out( 2, 1,"Duty cycle=12.5%");}

     if (act_temp == 30 && act_temp <35 )
       {PWM1_Start(); PWM1_Set_Duty(64);  Lcd_out( 2, 1,"Duty cycle= 25%"); }

     if (act_temp == 35 && act_temp <40 )
       {PWM1_Start(); PWM1_Set_Duty(96);  Lcd_out( 2, 1,"Duty cycle=37.5%");}

     if (act_temp == 40 && act_temp <45 )
       {PWM1_Start(); PWM1_Set_Duty(127); Lcd_out( 2, 1,"Duty cycle= 50%"); }

     if (act_temp == 45 && act_temp <50 )
       {PWM1_Start(); PWM1_Set_Duty(159); Lcd_out( 2, 1,"Duty cycle=62.5%");}

     if (act_temp == 50 && act_temp <55 )
       {PWM1_Start(); PWM1_Set_Duty(191); Lcd_out( 2, 1,"Duty cycle= 75%"); }

     if (act_temp == 55 && act_temp <60 )
       {PWM1_Start(); PWM1_Set_Duty(223); Lcd_out( 2, 1,"Duty cycle=87.5%");}

     if (act_temp >= 60  )
       {PWM1_Start(); PWM1_Set_Duty(255); Lcd_out( 2, 1,"Duty cycle= 100%");}

     if (portd.f0 == 1) flag = 1;
     if (portd.f0 == 0  && flag == 1)  // if the push button is pushed
        {
         i++;

         PWM1_Start();   //start PWM1
         duty = (i*255)/8 ;
         floattostr(duty,duty1);

         PWM1_Set_Duty(duty); // set duty cycle from 25% to 100%
         Lcd_out( 2, 1,"Duty cycle="); Lcd_out_cp(duty1); Lcd_out_cp("%");
         flag=0;
         delay_ms(10000);
        }
     if (i == 9 || act_temp < 25)
        {
         i = 0 ;
         PWM1_Stop();
         Lcd_Cmd(_LCD_CLEAR);
        }
    } //end loop
  } //end main