Need review and advice - First project - Board with Heltec Wireless Shell

[MercadoNegro]

Hello all,

I started this idea thinking on a weather station connected to TTN using Lorawan. It worked with standard ESP32 dev modules, then I decided to use this Heltec because it`s something I already had and I thought that was better to use it in a small board. All my I2C and the anemometer (based on a hall sensor) can be connected to 5V, for that reason I have the logic level converters.

This schematic and the PCB probably have lot of rookie mistakes that I need to fix before trying to put any order with JLC.

My idea was to use 4 layer PCB, with a power plane divided in two, mostly 3.3v and an L shaped section for 5v. I don`t know if this is a good practice, and this is one of the items where I need some advice.

The general schematic is based mostly on the corresponding IC datasheets and some other stuff I learned reading technical docs, forum posts and videos, like the reverse polarity protection. I`m not an electronic engineer and have some basic knowledge on electronics, for that reason lot of stuff could be wrong, but I tried to do my best here.

I used EasyEDA because is easy to use for a newbie and have the chance to check parts availability in JLCPCB, but I`m already learning Kicad for future projects. The post was initially posted in the beginner section, but I updated the schematic and the PCB and decided to move it here.

Please, can you help me with this and tell me what things are wrong and what should I correct?

Thanks!
Gustavo