help in Building easy Circuit by ardino microcntroler (Atmega 328p) without arduino board

I want build electronic project
its by

Atmega 328p + voltage regaletor + oscilator

+ potintimeter + led

To control the intensity of the led by potentimeter . by atmega 328p
without arduino board

i did the project by my self alone with arduino board . without any problem

. but . when i disconnect the atmega 328p from arduino uno . and i put it dirictly on the circuit below . ita not working with me!!

i attached my work below . circit and code

if any one can help me . to run this project .pls help me

Thanx