temperature sensor -PIC 16f877

#define slow 32 //Duty cycle set for slow
#define medium 96 //Duty cycle set for medium
#define fast 230 //Duty cycle for fast
#define cel20 41 //20'C
#define cel50 102 //50'C

//I set range as:
//Less than 20'C : speed is slow
//From 20'C to 50'C : speed is medium
//Greater than 50'C : speed is fast

int ADVal; //Variable to store ADC result
unsigned char duty;

void main(void){
     TRISC = 0;
     PORTC = 0;
     PWM1_Init(5000); //5khz pwm
     PWM1_Set_Duty(medium); //50% duty cycle
     PWM1_Start(); //Start PWM
     while (1){
           ADVal = ADC_Read(0);
           if (ADVal < cel20){
              duty = slow;
           }
           if ( (ADVal > cel20) & (ADVal < cel50) ){
              duty = medium;
           }
           if (ADVal > cel50){
              duty = fast;
           }
           PWM1_Set_Duty(duty); //Change duty cycle and adjust
           delay_ms(100); //Wait for adjusting (Optional and may be left out)
     }
}

program TempFanControl

'I set range as:
'Less than 20'C : speed is slow
'From 20'C to 50'C : speed is medium
'Greater than 50'C : speed is fast

dim ADVal as word 'Variable to store ADC result
dim duty as byte

const slow = 32 'Duty cycle set for slow
const medium = 96 'Duty cycle set for medium
const fast = 230 'Duty cycle for fast
const cel20 = 41 '20'C
const cel50 = 102 '50'C

main:
     TRISC = 0
     PORTC = 0
     PWM1_Init(5000) '5khz pwm
     PWM1_Set_Duty(medium) '50% duty cycle
     PWM1_Start() 'Start PWM
     while true
           ADVal = ADC_Read(0)
           if ADVal < cel20 then
              duty = slow
           end if
           if (ADVal > cel20) and (ADVal < cel50) then
              duty = medium
           end if
           if ADVal > cel50 then
              duty = fast
           end if
           PWM1_Set_Duty(duty) 'Change duty cycle and adjust
           delay_ms(100) 'Wait for adjusting (Optional and may be left out)
     wend
end.