Implementation for autonomous recording units

[MQO18]

Hi all, thank you in advance for all your support. I am currently working in a research Lab that has done before an implementation of teensy for recording birds (https://github.com/lzandberg/SongBeam).
This is my first time entering in the world of PCB designing so i would appreciate advice and recommendations in this new iteration of the device.
Most changes are 1) switching to TDM; 2) adding a rechargeable battery and solar module; 3) Fixing the deep sleep constraint of the timer of the TLP; 4) adding GPS.
I am happy to send my PCB or any files needed for a better look or just to discuss nice additions

 

[AndyA]

I must be missing it but where does the 3.3V come from? The only power supply related 3.3V net I can see is the input to the stepdown.

You have a note saying the GPS antenna connector should be close to the GPS module. This is good. Also make sure the GPS has a clean low noise power source. You may be using a module but adding some extra capacitors to the power input pin is normally a good thing. You're trying to pick up signals at about the same level as background noise, you want to avoid adding more noise.

For the switching supplies 1) keep them away from the GPS as much as possible and 2) follow the recommended layout as best you can. For those circuits especially the correct layout is critical.

Your 3 LEDs connected off the Teensy pins, I don't see a dot on the power junction, are the top and bottom ones connected to 3v3 or only to each other?

A couple of purely style related things -
Any reason why you have the microphone modules in those 4 blocks of 2? It makes for some very weird connection routing. I would have thought 8 separate blocks, arranged in pairs if needed, would give a cleaner layout.
Ground connections should point down, power connections should point up. I know it has no impact on the end result but sticking to conventions like that make it easier for other people to follow. e.g. when I'm looking for the source of the 3.3 it's easier to look for power net markers if they are above the other symbols in the area and in the expected orientation.
In a couple of places you've got symbols and text right up next to each other and then large empty spaces next to that block. Spread things out a bit more. Schematics are like code, you can get the exact same end result in lots of ways. You should aim for the way that is easiest to follow rather than the smallest or quickest to enter.

That said, these are purely a matter of style and everyone has their own personal preference so feel free to ignore. But I'm right ;-)