I think your best bet is to look for an appropriately sized electronic shelf labels, there are companies that specialise in them and they are already quite thin, battery powered and have bluetooth or nfc connectivity to change images.

Ooh, nice! Thank you, that looks great and only a tiny bit bigger, it also has a JST which is great.

This all seems really complicated but at the same time super interesting. Thanks for the recommendation.

I… Don’t actually know, I’ve just cobbled together information over the years. My dad worked in an electronics workshop but never taught me anything. There’s a good intro to electronics course on udemy and if you’re serious about it, try get the book The Art of Electronics, its like an electronics bible.

Thank you for your detailed reply, I really appreciate it. It answers my question and raises a whole bunch more :D, I think I need to brush up on general RF and get a better understanding of how it actually works. I shall do some youtubing and reading on it. I found a really good pdf that discussed antenna design but a lot of it I didn’t understand, so I’m going to need to learn a bit more.

Ill also take a look at the drone antennas too.

Thanks again for your help.

I do not. I’m planning on it though.

Do you know of others with charge controllers with that from factor? The only one close to it I’ve found is the is the m5stack m5stamp, but it doesn’t have a charge controller.

I don’t mind creating the daughter board, I think it could be fun.

The nRF was a useless inclusion tbh, sorry for the confusion. The nRF already has an smd antenna.

The thing with those antennas is the size of the antenna vs the size of the module, it’s almost twice the size, negating any benefit of having such a small module.

Hence my desire to use an SMD antenna on a small board instead.