Attempting To Design A Lower Power Version Of The Pro Mini

[iamnothere96]

Hello all,
I am trying to see if I can design a lower power version of the pro mini than what one can buy. This is for a bigger project of mine where I look into energy harvesting and if it can extend battery life for a low power application. I have done this schematic in KiCAD following the arduino schematic for the pro mini while tweaking a few things like using another voltage regulator and having no power LED since that is what I've seen people do to the base pro mini to get power consumption down.
This is the arduino schematic:

Arduino-Pro-Mini-schematic.pdf

The application for this was like temp, humidity and such monitoring so I also added a BME680 and used this schematic design from Sparkfun:

Environmental_Sensor_Breakout_BME680.pdf

There is also some pins for me to connect an e-paper display to display all the info, would used one from waveshare: here

This is the KiCAD schematic from me:

This is the full schematic:

More up close pictures of each segment of the schematic in comments, could not put in post because I have a limit

And then the 3D model, it's 4 layers so I could have a ground plane and a power plane:

I understand it's not quite pretty or space efficient but I wanted to hear opinions on its viability like if it would actually work or if I overlooked anything. I would appreciate any advice or suggestions for this. Also are the capacitors here supposed to be the load capacitance of the crystal oscillator? I'm using the HC49 which has load capacitance of 20pF.

Thank you for your time, really appreciate the help

[zwieblum]

your schematic is unreadbly small.

[herbschwarz]

The load capacitance or correlation capacitance of the crystal is the value set by the manufacturer to make the crystal oscillate at the specified frequency within the stated tolerance. Since this is a small value, the strays added by the PCB foil traces, IC pins and proximity to other things in the area add to the load on the crystal. It will not be easy to predict the actual value in circuit. If the actual crystal oscillating frequency is very critical, the designer will make one of the load capacitors variable. The 20 pf caps shown are actually in series and so present a 10 pf load to the crystal pins. The rest of the load is left for the stray capacitance.

[srnet]

If you want people to comment on the design\schematic you would need to post one that can be read.

[iamnothere96]

Yes, I wanted to add more pictures but was limited. Here is voltage regulator:

AtMega328p:

[iamnothere96]

BME680 from schematic:

FTDI breakout, battery and e-paper display:

[iamnothere96]

I could not post all my pictures at first because of limits due to being new but they are in comments now

[iamnothere96]

Thank you! Have made those changes

[westfw]

@iamnothere96

Here is voltage regulator

Note that this is still a linear regulator, and will always dissipate at least (V_in-3.3)*I_circuit

"Better" linear regulators will be closer to that value and/or work with a lower V_in, worse regulators add a quiescent current and/or have minimum output current requirements.