[john]

 hi frnd!

Texas instrument gives ADC IC’s with ads series which is a serial ADC by using that you can detect -ve voltages also.

[john]

 hi frnd!

Texas instrument gives ADC IC’s with ads series which is a serial ADC by using that you can detect -ve voltages also.

[john]

you can choose either of language

here is the code in C

 

// Program to make a bidirectional visitor counter using IR sensor

#include <reg51.h>

#define msec 1

unsigned int num=0;

sbit dig_ctrl_4=P1^3;  //declare the control pins of seven segments

sbit dig_ctrl_3=P1^2;

sbit dig_ctrl_2=P1^1;

sbit dig_ctrl_1=P1^0;

unsigned int digi_val[10]={0x40,0xF9,0x24,0x30,0x19,0x12,0x02,0xF8,0x00,0x10};

unsigned int dig_1,dig_2,dig_3,dig_4,test=0;

unsigned char dig_disp=0;

sbit up=P3^5;  //up pin to make counter count up

sbit down=P3^6;  //down pin to make counter count down



void init()  // to initialize the output pins and Timer0

{

up=down=1;

dig_ctrl_4 = 0;

dig_ctrl_3 = 0;

dig_ctrl_2 = 0;

dig_ctrl_1 = 0;

TMOD=0x01;

TL0=0xf6;

TH0=0xFf;

IE=0x82;

TR0=1;

}



void delay()  //To provide a small time delay

{

TMOD=0x01;

TL0=0x36;

TH0=0xF6;

TR0=1;

while(TF0==0);

TR0=0;

TF0=0;

}



void display() interrupt 1  // Function to display the digits on seven segment. For more details refer seven segment multiplexing.

{

TL0=0x36;

TH0=0xf6;

P2=0xFF;

dig_ctrl_1 = dig_ctrl_3 = dig_ctrl_2 = dig_ctrl_4 = 0;

dig_disp++;

dig_disp=dig_disp%4;

switch(dig_disp)

{



case 0:

P2= digi_val[dig_1];

dig_ctrl_1 = 1;

break;



case 1:

P2= digi_val[dig_2];

dig_ctrl_2 = 1;

break;



case 2:

P2= digi_val[dig_3];

dig_ctrl_3 = 1;

break;



case 3:

P2= digi_val[dig_4];

dig_ctrl_4 = 1;

break;

}

}



void main()

{

init();

while(1)

{

if(up==0&&down==1)  //check if up pin is pressed

{

test++;

num=test;

dig_4=num%10;

num=num/10;

dig_3=num%10;

num=num/10;

dig_2=num%10;

dig_1=num/10;

if(test==9999)

test=0;

}

if(up==1&&down==0)  //check if down pin is pressed

{

test--;

num=test;

dig_4=num%10;

num=num/10;

dig_3=num%10;

num=num/10;

dig_2=num%10;

dig_1=num/10;

if(test==0)

test=9999;

}

} 

 

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