Hello friends, a good idea of privileging the execution of main program of microcontroller came in my mind after watching a Si-Fi movie……and I did it………
Password protecting your microcontroller is one of the coolest things you can do with it……
I created a routine that reads 5 keystrokes and then checks weather the inserted password is right or not.
Password protecting your microcontroller is one of the coolest things you can do with it……
I created a routine that reads 5 keystrokes and then checks weather the inserted password is right or not.
the micro controller here used is Atmega 8535
Not discussing much more about logic, here is the program
----------------------------------------------------------------------------------------------
void main()
{
unsigned char a,b,c,d,e;
DDRA=0x00;
PORTA=0xff;
//ask for password
while(1)
{
lcd_init();
lcd_string("Enter a 5 digit");
lcd_gotoxy(1,0);
lcd_string("Password:");
//read password
while(PINA==0xff); //if all keys open stay here
a=PINA;
delayms(200);
lcd_gotoxy(1,0);
lcd_string("Password:*");
while((PINA&0xf0)!=0xf0); //wait to release the key
while(PINA==0xff);
b=PINA;
delayms(200);
lcd_gotoxy(1,0);
lcd_string("Password:**");
while((PINA&0xf0)!=0xf0); //wait to release the key
while(PINA==0xff);
c=PINA;
delayms(200);
lcd_gotoxy(1,0);
lcd_string("Password:***");
while((PINA&0xf0)!=0xf0); //wait to release the key
while(PINA==0xff);
d=PINA;
delayms(200);
lcd_gotoxy(1,0);
lcd_string("Password:****");
while((PINA&0xf0)!=0xf0); //wait to release the key
while(PINA==0xff);
e=PINA;
delayms(200);
lcd_gotoxy(1,0);
lcd_string("Password:*****"); //wait to release the key
//checking the password
if(a==0xef)
{
if(b==0xdf)
{
if(c==0xbf)
{if(d==0x7f)
{
if(e==0xef)
{
lcd_init();
lcd_string("Welcome");
goto wait;
}
else
{
lcd_init();
lcd_string("Invalid password!!");
delayms(2000);
}
}
else
{
lcd_init();
lcd_string("Invalid password!!");
delayms(2000);
}
}
else
{
lcd_init();
lcd_string("Invalid password!!");
delayms(2000);
}
}
else
{
lcd_init();
lcd_string("Invalid password!!");
delayms(2000);
}
}
else
{
lcd_init();
lcd_string("Invalid password!!");
delayms(2000);
}
}
wait:while(1);
}
----------------------------------------------------------------------------------------------
and no post is completed without a video,
:)
