trouble with a simple avr project

[JUBAYER]

i have written the following codes for simple experimental purpose.regrettably the program works fine in the Proteus simulation. but when i tried with hardware..it did not work.i don't understand why??? :?:
the codes and schematic are attached.i would really appreciate a little help...

 

[nagkiller]

You try the minimum atmega circuit???

like this :

 

[jayanth.devarayanadurga]

Try this

---

Code C - [expand]
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if(PINB0)
{   _delay_ms(50);
    if(PINB0)
    {
           PORTD = 0x02;
           
    }
}

---

 

[JUBAYER]

no.....but i am using internal RC oscillator......so is that really necessary?

 

[jayanth.devarayanadurga]

If you have enabled MCLR then you need to pull up MCLR pins with 10k.