Add note suggesting RAMBo users use the RAMBo board type or platformio environment

[bgort]

Add note suggesting RAMBo users use the RAMBo board type or platformio environment, per #4689 (comment).

Also add note that Viki 2.0 wiring diagram v1.2 has a mistake in it;

[thinkyhead]

This is fine, but educate me: Why wouldn't RAMBo users already be using BOARD_RAMBO? And if a user is that daft, why would we expect them to go reading the pins_RAMBO.h file for help?

[bgort]

I would assume Rambo users are using BOARD_RAMBO, generally. This note is about compiling with the 'RAMBo' board type in the Arduino IDE, or 'reprap_rambo' in platformio.ini, as opposed to the standard Mega 2560 board type.

That there's a need to use anything beyond the 'Mega 2560' option, or that 'RAMBo'/'reprap_rambo' are even options, is apparently unknown to a good number of people, including tech support where I bought my Viki2, and where I bought my RAMBo.

I agree that putting this kind of notice in pins_RAMBO.h isn't ideal, but I don't know where else it should go and I figure those needing to edit that file (which is where the use of the extended pins on a Rambo could come into play), and those in the situation I was in trying to make accessories/addons work, without luck, will see it and be saved some hassle/wasted time. It would have helped me.

[thinkyhead]

Ah, sorry for my missing the point. This is a good addition.

[bgort]

No worries. Glad you included it. Think it will help people.