I have worked with Arduino UNO R3 board and developed a project and it is working as per need.
Arduino development environment used ver 1.6.12
Now I wish to develop a stand alone mode i.e. as a Product with PCB, AtMega 328 Micro-controller and other required inputs/ outputs.
I understand that Arduino UNO R3 board is communicating with USB for programming etc. But I want to communicate with SCI or SPI communication (with out USB) and wish to reuse the developed software program with minor changes as per need.
Can you please suggest/ guide me "How can I use the software program developed for Arduino R3 board for stand alone Atmega 328 device (with our USB communication).
Please find the attached snapshot of the software program in the attached zip file