I'm getting ready to place a bulk order for a dozen pieces of a gadget I've designed. I've got the prototype running with an ATMega328p on a boardboard using the 8 MHz internal clock, which I managed to do by following the various tutorials online that involve using a custom hardware file, etc.
When I place the bulk order (which I've never done before), I assume they'll want me to upload the hex file of the sketch (since this is a turnkey order - they'll be acquiring the controllers, not me) for mass programming. My question is - will the hex file of my sketch cause the controller to make use of the 8 MHz internal clock the way it's doing for me here? Or is there/are there some other steps I need to do to ensure this happens?
I don't want to send them all the info a few hundred dollars and get a gadget back that doesn't work because it was expecting me to have a 16 MHz crystal somewhere on the board...