miniproject on 8051

[noddy]

can someone help me to implement a simple calculator using 8051:idea:

 

[:pH]

its pretty simple , will upload soon:-D

 

[manu8193]

hello noddy,
simple calculator means 4x4 keypad
here iam 4x4 keypad with 16x2 LCD is interfacing with 8051(AT89C51)


#include<reg51.h>
sbit r1=P1^0;
sbit r2=P1^1;
sbit r3=P1^2;
sbit r4=P1^3;
sbit c1=P1^4;
sbit c2=P1^5;
sbit c3=P1^6;
sbit c4=P1^7;

sfr lcd=0xA0;//lcd data pins
sbit RS=P3^0;
sbit RW=P3^1;
sbit EN=P3^2;

void delay(unsigned int t)
{
unsigned int i,j;
for(i=0;i<t;i++)
for(j=0;j<1000;j++);
}

void lcd_cmd(char cmd)
{
P2=cmd;
RS=0;
RW=0;
EN=1;
delay(50);
EN=0;
}

void lcd_data(char dat)
{
P2=dat;
RS=1;
RW=0;
EN=1;
delay(50);
EN=0;
}

void lcd_init()
{
lcd_cmd(0x38);
lcd_cmd(0x0c);
lcd_cmd(0x01);
lcd_cmd(0x06);
lcd_cmd(0x80);
}

void main()
{
unsigned int i;
lcd_init();
while(1)
{
for(i=0;i<4;i++)
{
if(i==0)
{
r1=0;
r2=r3=r4=1;
if(c1==0)
{
lcd_data('7');
delay(100);
}
else if(c2==0)
{
lcd_data('8');
delay(100);
}
else if(c3==0)
{
lcd_data('9');
delay(100);
}
else if(c4==0)
{
lcd_data('/');
delay(100);
}
}

if(i==1)
{
r1=r3=r4=1;
r2=0;
if(c1==0)
{
lcd_data('4');
delay(100);
}
else if(c2==0)
{
lcd_data('5');
delay(100);
}
else if(c3==0)
{
lcd_data('6');
delay(100);
}
else if(c4==0)
{
lcd_data('*');
delay(100);
}
}

if(i==2)
{
r1=r2=r4=1;
r3=0;
if(c1==0)
{
lcd_data('1');
delay(100);
}
else if(c2==0)
{
lcd_data('2');
delay(100);
}
else if(c3==0)
{
lcd_data('3');
delay(100);
}
else if(c4==0)
{
lcd_data('-');
delay(100);
}
}

if(i==3)
{
r1=r2=r3=1;
r4=0;
if(c1==0)
{
lcd_cmd(0x01);
delay(100);
}
else if(c2==0)
{
lcd_data('0');
delay(100);
}
else if(c3==0)
{
lcd_data('=');
delay(100);
}
else if(c4==0)
{
lcd_data('+');
delay(100);
}
}
}
}
}