Hey all,
I'll just preface this with my skillset. I love to disassemble, diagnose, and repair devices & circuits. I have not designed a circuit although I understand EE to a decent extent to where I believe I could with a bit of help.
Alright, so GF is moving to a large metro area where having an electric bike is super helpful, and also super desirable. So she wanted to put a tile inside the metal frame of the bike (which she quickly realized was a bad idea when I mentioned signal strength,) but was excited about the prospect of my idea when I brought it up, which was to take the tile and it's 1 off battery and power it from the E-Bike's battery.
This way any would be thief would help with getting themselves caught as long as they keep it charged as they use it. Muahahah
So my idea is
Disassemble and find space inside the e-bike's battery pack to place the tile's PCB & additional components
Devise a way to step down E-Bike Battery (henceforth EBB) Voltage (13S li-ion [54.6V max]) & ideally charge a small dedicated rechargeable li-ion cell for the tile. This way if the EBB hits the low voltage cut off the tile will still be able to be powered for a year or 2.
From my experience, this is my plan so far
I'll need a buck regulator placed post EBB BMS that steps down the max 54.6V to 4.1V which will then power an added Li-Ion BMS (henceforth TileBMS) connected to the dedicated cell for the tile. There will then be another buck regulator that will step down the dedicated cell to 3V which is what the tile expects (Originally powered by a 3V CR2025) The Tile is extremely power efficient (typically lasts one year on 150mah) so all components can be super low powered which should make them small.
My biggest constraint is volume. I have a considerably small space to work with so all these components will need to be small and I am not sure how to search for breakout boards by size. Also I am not even sure if such small breakout boards exist. Theoretically they should. I've done some searching but haven't come across any.
So I was hoping someone with more experience could help me with what I should do from here now that I have the theoretical plan, and procurement of the devices I'd need.
Also, I'd love to hear your thoughts on this project.
Thanks for any help you can offer!