Is it essential to upload a sketch to a arduino board without connections to circuitry?
Or is it ok to upload after the board is wired into the project it is intended for?
- You can do either.
Note that on AVR based boards, pins 0 and 1 are used by the hardware Serial interface and to upload code. If you have anything connected to those pins then it may interfere with the upload
1 Like
Thanks for the prompt replies!
It depends on what circuitry is connected. You might be surprised to find out that not all circuits are the same identical thing.