what is the best way to solder the ISP header pins to the NANO without having to remove it from the Raduino board? I want to back a backup copy of the firmware already on my Raduino bard before I attempt to update it.
Wow! Not a simple task considering how close
the Nano is to the pc board.
Probably the best (easiest) way is to solder a six-conductor wire
and lead that out to a six-pin connector. Color code it so that red
is V+ and Black is ground.
Note that Avrdude and Avrdudess will knock out the boot
loader if used to load new software. Their first task is to wipe clean
the entire memory space of the mCu. You must take special pains to
avoid that if you are ever going to use a USB loader again.
The square hole is pin1. The pins are stagggered, i.e., they run
1-3-5 and 2-4-6.
2 4 6
1 3 5
The rest is a standard ICSP header.