Hi First time posting here. I have just finished my first arduino project prototype and it is all running nicely on breadboard. It's currently powered through usb but will be required to work outdoors from battery in practice.
I would like to make the finished device rechargeable and as efficient as possible so I plan on using switching regulators and lithium batteries. I have both 5v and 3.3v components to power as well as the 5v arduino micro.
I need to be able to use the usb port on the arduino micro to connect to a PC GUI I have written in order to download data collected on the arduino.
So my idea was to use a 7.4v lithium rechargeable battery to power a 5v switching regulator and connect this to the 5v pin on the arduino....thereby bypassing any inefficient linear regulator. For my 3.3v components I am undecided on whether to use a second 3.3v switching regulator or to use the 3.3v pin on the arduino and accept some inefficiency.
I would also like to be able to easily charge the battery bearing in mind everything will be contained in a waterproof enclosure. The ideal scenario would be to charge the battery through the arduino usb socket but I realise this could be difficult to achieve...perhaps a more realistic goal is to have a separate charging socket on the side of the box.
My background is software and none power electronics...which is why I have come for advice and help with the power side of things which I'm less familier with.
I would be greatful for any advice or potential pitfalls or suggestions you may have on this topic. Any advice on circuit design welcomed and recomendations of components to use especially for the battery and regulators as I haven't sourced these before.
In terms of power requirements...I haven't measured the current draw accurately yet but the whole thing is running perfectly well if usb current
Thanks in advance