Hey! I'm trying to create something with some power cells, and I've run into the issue of inconsistent power supply. I'd like to supplement power from a solar cell with a battery, but I'm not exactly sure how to keep the input to something at a set value. Basically, when the solar cell supply falls below a certain level, I'd like to supply the missing power with the battery. Anyone have any ideas? I really don't know if any hardware exists for this already. The idea of using a microcontroller came up (and I can write assembly, so using one's not an issue). Thanks for any input.