After a long hiatus, I am back with a few projects in mind. Here’s the first one! It’s just a very simple battery light with 18650s. My bathroom is dark and the only light is tied to a fan, which can be very loud in the morning
I wasn’t sure how I wanted to lay out the LEDs and if I wanted to do some in series and or parallel. The schematic has space for 6 LEDs all in parallel, but I’m thinking about changing up the setup based on some of your feedback.
The design is a very simple linear regulator. The question I have is should I do two LED is series and with two 18650s in series, or should I do LEDs in parallel and two batteries in parallel. I’m not sure what would be more efficient. I’m thinking that parallel batteries would be better since there should be less voltage overhead for the FET to deal with when the batteries are full.
I still need a case for it, which is something I’m not sure how to do best. Some form of opaque lens would be great, and something to hold the PCB in place. I’ve ordered the PCB already with two sets of mounting holes. I did order one box, but I’m not sure if it will work out now that I see it.
Now that I’m looking at it, I forgot to include pads for a switch!
Forgot to mention that I built a small prototype to confirm that the circuit would work as intended and also see if there was anything wrong with the LEDs position. The current locations are the same as the PCB. Overall it seems okay, Fairly bright, but harsh. A lens should help with that and currents might need to be tweaked to make it better.