alcohol detector mq3 with vehicle controlling interfacing 8051 pcb design and code

[amrutha735]

//LCD Module Connections
sbit RS = P0^0;
sbit EN = P0^1;
sbit D0 = P2^0;
sbit D1 = P2^1;
sbit D2 = P2^2;
sbit D3 = P2^3;
sbit D4 = P2^4;
sbit D5 = P2^5;
sbit D6 = P2^6;
sbit D7 = P2^7;
//End LCD Module Connections

//Keypad Connections
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;
//End Keypad Connections

void Delay(int a)
{
int j;
int i;
for(i=0;i<a;i++)
{
for(j=0;j<100;j++)
{
}
}
}

char Read_Keypad()
{
C1=1;
C2=1;
C3=1;
C4=1;
R1=0;
R2=1;
R3=1;
R4=1;
if(C1==0){Delay(100);while(C1==0);return '7';}
if(C2==0){Delay(100);while(C2==0);return '8';}
if(C3==0){Delay(100);while(C3==0);return '9';}
if(C4==0){Delay(100);while(C4==0);return '/';}
R1=1;
R2=0;
R3=1;
R4=1;
if(C1==0){Delay(100);while(C1==0);return '4';}
if(C2==0){Delay(100);while(C2==0);return '5';}
if(C3==0){Delay(100);while(C3==0);return '6';}
if(C4==0){Delay(100);while(C4==0);return 'X';}
R1=1;
R2=1;
R3=0;
R4=1;
if(C1==0){Delay(100);while(C1==0);return '1';}
if(C2==0){Delay(100);while(C2==0);return '2';}
if(C3==0){Delay(100);while(C3==0);return '3';}
if(C4==0){Delay(100);while(C4==0);return '-';}
R1=1;
R2=1;
R3=1;
R4=0;
if(C1==0){Delay(100);while(C1==0);return 'C';}
if(C2==0){Delay(100);while(C2==0);return '0';}
if(C3==0){Delay(100);while(C3==0);return '=';}
if(C4==0){Delay(100);while(C4==0);return '+';}
return 0;
}

void main()
{
int i=0;
char c,p;
Lcd8_Init();
while(1)
{
Lcd8_Set_Cursor(1,1);
Lcd8_Write_String("Keys Pressed:");
Lcd8_Set_Cursor(2,1);
Lcd8_Write_String("Times:");
while(!(c = Read_Keypad()));
p=c;
while(p==c)
{
i++;
Lcd8_Set_Cursor(1,14);
Lcd8_Write_Char©;
Lcd8_Set_Cursor(2,7);
Lcd8_Write_Char(i+48);
Delay(100);
while(!(c = Read_Keypad()));
}
i=0;
Lcd8_Clear();
}
}