[SOLVED] How to stabilize ADC using PIC

#define Dl_Relay PORTC.B2
#define Relay_1  PORTC.B1
#define Relay_2  PORTC.B2
#define Relay_3  PORTC.B3
#define test     PORTC.B1
char i=0,j=0,cycle=1,Flag=0,biggest_val[5];
unsigned int mains_val=0,a=0,b=0,k=0,d=0,Average=0;

void peak_detector(){
     while(a<b){
     a = ADC_Read(0);
     //Delay_us(750);
     b = ADC_Read(0);
     //Delay_us(750);
     }
     
      k = a; 
     biggest_val[i++]=k; 
     
     if(i==5){
              Average = (biggest_val[0] +biggest_val[1] +biggest_val[2] +biggest_val[3] +biggest_val[4])/5;
              
              if(Average<155) Dl_Relay = 0;
              if((Average>155) && (Average<200)) Dl_Relay = 1;
              if(Average>200) Dl_Relay = 0;
     i=0;
     }

}
void falling_edge(){
     while(a>b){
     a = ADC_Read(0);
     //Delay_us(750);
     b = ADC_Read(0);
     //Delay_us(750);       
     }
}

void led(){
     PORTC.B5 = 0;                   //LED ON-OFF
     PORTC.B4 = 1;
     Delay_ms(200);
     PORTC.B4 = 0;
     Delay_ms(200);
}

void main() {
     TRISA = 0x11111101;
     TRISC = 0x00;                       //PORTC as O/p
     ADC_Init();
     led();
     led();
     
     while(1){
              
              mains_val = ADC_Read(0);
              //Delay_us(200);
             
              while(mains_val<5){
              mains_val = ADC_Read(0);
              //Delay_us(200);
              }
              
              if(mains_val>5){
              a = ADC_Read(0);
              //Delay_us(200);
              b = ADC_Read(0);
              //Delay_us(70);
             
              if(a<b) peak_detector();
              if(a>b) falling_edge();
              }
     
     }

}

if(Average<154) Dl_Relay = 0;
..don't change relay state when 154 and 155
if(Average >156) Dl_Relay = 1;