what if I remove ATmega328 from Arduino UNO R3?

Using Arduino Microcontrollers
1

If I remove Arduino's Atmega328 IC and build the same circuitry on the breadboard by using 16MHz crystal and other components (that we can use to make arduino uno on breadboard), will it work as same as before?
P.S. I have already uploaded the sketch.

2

Yes.
Buy some extra controllers for projects like this.

3

priteshgupta:
If I remove Arduino's Atmega328 IC and build the same circuitry on the breadboard by using 16MHz crystal and other components (that we can use to make arduino uno on breadboard), will it work as same as before?
P.S. I have already uploaded the sketch.

Yes.

But it's much easier to use a Pro Mini (maybe even cheaper, too).

4

If you use a naked Atmega328P and burn the fuses for 8MHz using the internal oscillator, then you can create an entire Arduino with only the microcontroller:

Add a crystal and a couple of crystal load capacitors a bypass capacitor for V+ and you can run at 16MHz:

more pix here: http://www.hackster.io/rayburne/flat-duino

Ray

5

priteshgupta:
If I remove Arduino's Atmega328 IC and build the same circuitry on the breadboard by using 16MHz crystal and other components (that we can use to make arduino uno on breadboard), will it work as same as before?
P.S. I have already uploaded the sketch.

That's the goal. Arduino is useful to fast testing of your proyects prototipes, and when the work is ready you may remove the Atmega328 and put it in your own circuit.

6

If you remove it Do you have to Fuse it before at 8MHz if you plan to not use a crystal?

7

fungus:
But it's much easier to use a Pro Mini (maybe even cheaper, too).

Well, if we are talking about cheap Chinese clones, it is absolutely cheaper!

bodtx:
If you remove it Do you have to Fuse it before at 8MHz if you plan to not use a crystal?

Sure do!
Nick's resource.

8

If you do buy a pro mini from Ebay, there is a 168 and 328 version, get the 328.
.

9