how to make 8051 to recognise i/p only greater than a specified voltage?

[Greeshma N D]

My project is on blood leakage monitoring system.It uses TCST110 photointerrupter. Curently in proteus i've used pc817d and some resistors instead of tcst110.i can make 8051 detect the photointerrupter's on condition, but unable to make it to respond only when photointerruprt's o/p is above specified vlg(.03V ).what changes should i make in the code.

code is as follows:

#include "REG51.h"

#include <stdio.h>

#define buz P1

sbit LED_pin = P2^0; //Defining LED PIN

sbit sensor_pin = P0^0; //Defining output of sensor  PIN

void Delay(int); //Function prototype declaration

void main (void)

{ buz=0x00;  //buzzer off

  sensor_pin = 1; // if sensor is low 

  LED_pin=0; //LED off 

  while(1) //infinite loop

  {

    if(sensor_pin == 0 ) //If sensor is high 

    {

      LED_pin = 1; //LED ON

buz=0x01;      // ON Buzzer

Delay(6000); //Delay

buz=0x00; // OFF Buzzer

      LED_pin = 0; //LED OFF

 Delay(6000);

    }}}

 void Delay(int k)

{ int j;

  int i;

  for(i=0;i<k;i++)

  {

    for(j=0;j<100;j++)

    { } }

}

 

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