Hi all, I am trying to figure out the best (simplest) way to power my projects with batteries. I currently have both 3.3v and 5v components and I also occasionally require higher voltage (9-12v) for powering motors.
My solution is to use rechargeable NiMh cells for the motors and use power electronics for the electronics. I created a spread sheet with the number of cells, the usable voltage range, and the type of converter I should use. For example, if I go with two NiMh cells to a 3.3v Arduino I should use a boost converter to boost from 3v to 3.3v when fully charged and 1.8v to 3.3v when dead where as 3 cells would require a buck/boost circuit. It looks like boost and buck/boost circuits are much larger and more expensive than buck converters. I have several projects in the works and it would be nice to have a standard system for powering them (e.g. if it’s 3.3v, use a 2 cell pack with a boost circuit or if its a motorized robot use 6 cells and a buck circuit)
From a practical standpoint, what type of regulator is preferred and what is a good “go to” circuit (like the 7805)? It would be real nice to order a box of 2 and 6 cell battery holders and several of the same regulator circuits to have “cookie cutter” power sources.
Note, I am aware of Arduinos including a small regulator but I am currently working with the DIY kind. I am also not interested in using lithium batteries.