I've designed an industrial prototype using Arduino Mega board.I want to use only Atmega2560 chip. Please help me out, how to use that. How to program and what is the circuitry. Thanks in advance.
I think you want to use Microcontroller ATmega2560 alone. In that case you have to design a PCB for the basic circuit of microcontroller and then get hex file from Arduino IDE and upload it via AVR burner into ATmega2560. Share more details to get proper help.
You can start with the Arduino Mega2560 "Reference Design", which has schematics and PCB (in CAD "source code" form) published at the Arduino site.