I am working on a form factor constraint project where I need to save space as much as possible, so I was guessing if I could make work to use ATmega328 chip with arduino without the external crystal and I came across this link:
Pretty much easy since all the stuff is explained there. Still one thing I would like to know that what are the compromises I have to make if I implement this. I read that speed, serial communications and delays are affected by this. I wish to communicate this Atmega328 chip programmed in arduino with NRF52840 dongle and receive the data from it through serial and once it is done then store it on SD card. In later phase, I need to reveres this process as well like retreive the data from SD card and give it to the dongle via serial again. So my question is, if I happened to run my atmega chip on its internal crystal would this be possible or not? if its possible, would it be reliable?
Thanks in advance.