My son (9yrs) has become interested in robotics. I did a course on it in college, but that was a LOOONG time ago and the course was much more rooted in programming than it was in electrical engineering. So, I'm learning as I go so that I can keep the project as wrinkle-free as possible.
I know that pre-built options for what I'm building already exist... but I don't learn anything having someone else do it for me!
So... I wish to build a "dual stepper motor driver" (I'm sure there's a better name for it, but that's what comes to mind), I plan to take the main power source (12V) and push it through a 5V regulator to supply the logic, to make the board as "self contained" as possible, rather than rely on the Arduino for my 5V supply.
I've already got a 100uF cap across Vmot/gnd, but there's the 5V logic Vin/gnd.... should I put a decoupling cap on that, as well, since it's coming from the same power supply?
I'm inclined to believe "it's not needed but it's a good practice", but I wanted to ask and be sure.
As I understand it the idea is to provide a "current buffer" to protect against a sudden need for power which can in turn cause harmful voltage drop or noise, and the logic really wouldn't draw much in the way of current, all while the minimum voltage I expect to see from the battery is 11.7V near empty (still exceeding minimum that the regulator would need... right?).