My application calls for 4 Arduinos. (I am using 4 Seeeduinos XIAO.) I plan on using the same sketch for all Seeeduinos; but they all do partially different things. Each one has a dedicated section within the sketch. Like this I have only one master sketch and do not have to remember what sketch goes with what Seeeduino, and can just upload the same sketch to each of them. I sacrifice a pins V read to assign the type of work it has to perform. The 4 assignments are as follows: GND, 3.3V, 0.4V, and 0.6-3.1V.
I started reading about interrupt pins, registers, over-clock behaviors before discovering FreeRTOS. (In my case it would be #include <Seeed_Arduino_FreeRTOS.h>) But before I dive into coding, is there anything to look out for in structuring my sketch in such a way? I guess my question is: is FreeRTOS somewhat smart, or am I asking for trouble structuring it as such?
FreeRTOS manual is 400 pages long
Lots of new things to learn.
Search for Digikey's Introduction to RTOS series of 12 lessons with code examples.
Personally I just use simple multi-tasking unless there is a pressing need for RTOS
unless you are just keen to learn RTOS
Almost always said by beginners and almost always it is not. Adding an extra processor should be something you do as a last resort, because it is just insufficient experience / knowledge that is bringing you to that conclusion. It is often a sign that you are tackling a project that is too advanced for your current state of knowledge.