i am new with ARDUINO. I am trying to make a DIGITAL CLOCK with arduino UNO R3 with microcontroller atmega328p-pu. Now my question is how should I use microcontroller in PCB without DEVELOPMENT BOARD.. How to apply resistance to resist the overflowing of current?
How to apply resistance to resist the overflowing of current?
Your USE of CAPITALS has me CONFUSED, frankly.
You mean current limiting resistors? Well, if you are driving something from the 328P's pin, the max is 20mA. At 5V, you will need a 300 ohm resistor for a LED.
srijanbhar:
I am new with Arduino.
Clearly. 
srijanbhar:
I am trying to make a digital clock with Arduino UNO R3 with microcontroller atmega328p-pu. Now my question is how should I use microcontroller in PCB without development board
Use a "production" module. Check out a "Pro Mini" board - it has most of the core components that you need already assembled, but no USB interface as you do not need that for a clock.
srijanbhar:
How to apply resistance to resist the overflowing of current?
Your guess is as good as mine. Build the dyke higher?
srijanbhar:
i am new with ARDUINO. I am trying to make a DIGITAL CLOCK with arduino UNO R3 with microcontroller atmega328p-pu. Now my question is how should I use microcontroller in PCB without DEVELOPMENT BOARD.. How to apply resistance to resist the overflowing of current?
Always search for something similar (research first) to help you understand the overall concept. Then build-out on breadboard to ensure you understand. Lastly, modify design and software to work the way you want your final project to work.
There are so very many clock designs using Arduino... use Google search ti locate something to use as a template:
Examples...
7-Segment clocks
Good luck!
Ray
My Clock