Reddit:Electronics

Took some photos of an A15 CPU I was reballing today.

Made this a few months back. I thought this was a neat way of packaging the two prismatic caps for a flat high power density package.

This set has served me well - RIP.

After a few years of copying and rerouting a few battery management designs for each project that required it got a bit tiring for me, so I wanted to make a small module that would cover a lot of use cases (for me at least).
So I ended up with 22.23mm*16.51mm module with 4+16 ADC channels, 2A li-po battery charger, battery current measuring, on-module temperature sensor, uvlo, 3 leds, low on resistance output mosfet and a few more thingies.

Primary goal was to provide a simple drop-in way to add power management features to projects, mainly on/off behavior using a switch.

I got it all working using only interrupts so the cpu sleeps most of the time for power saving.

Anyways, it's all open source, so if you're into small 6 layer PCBs you can make one for yourself
https://github.com/EDrTech/PMG001

Also an adapter board with dual ch340c for serial and updi

https://preview.redd.it/v2gbwuwlxcld1.png?width=1203&format=png&auto=webp&s=aca3c4b59ac15b4be2fb41fb2bd221f2d65ea809

https://preview.redd.it/t0cnqmmpxcld1.jpg?width=1200&format=pjpg&auto=webp&s=d7757a687e67a3c92d351049bd65ddddce96669a

https://preview.redd.it/t34x6ggyxcld1.png?width=853&format=png&auto=webp&s=b6f99248ef7d9e81e5ae7ba5541cba59899b7eef

I developed this powerbank because i was searching for one with special features, but i found out that there aren't a lot of them and also the one powerbanks that i found were quite expensive and didnt have all the features i wanted.

So i set out on a mission to create a better one just like i imagined it.

https://preview.redd.it/19rx67bkp1ld1.jpg?width=4539&format=pjpg&auto=webp&s=259f279389d4897c5f475e5bf4e34f614b2f102f

https://preview.redd.it/qcjt8cjlp1ld1.jpg?width=3868&format=pjpg&auto=webp&s=ae8eacf0921e9d0f0a1ff8f940227186eadac480

https://preview.redd.it/0fd68mpmp1ld1.jpg?width=2150&format=pjpg&auto=webp&s=1616352967b0e5885e57929b9f771f0f3c3ba51f

https://preview.redd.it/hfs8nh6np1ld1.jpg?width=3115&format=pjpg&auto=webp&s=3d3b1b0436167c46e947011760323c40513167a1

This is a prototype version, i'm currently designing a new version which will be thinner and have more features.

I also designed this project using only open-source and free software, like KiCAD, FreeCAD, VSCode...

Here are the main features:

-It has a total capacity of 93Wh (25000mAh) so it's airline safe

-Bidirectional USB C power delivery port 100W up to 20V

-Bidirectional adjustable DC port with adjustable voltage from 3-32V and adjustable current from 300mA up to 5A also 100W

-Both ports support MPPT tracking as universal voltage inputs and adjust the charging power based on the capabilities of the charger and the power drawn from the batteries

-Dual USB A ports each up to 25W 5-9-12V supporting all modern fast charging protocols

-Bright 280 lumen LED flashlight with adjustable brightness built in

-Passthrough mode supported so powerbank can be charged and power other devices at the same time

-Color screen shows all relevant information like input/output power, temperature of the batteries and the board, battery percentage, voltage, current and power of the DC port and enables the user to interact with the powerbank by the two buttons on the side.

Future features that i plan to implement:

-Adjustable discharge and charge limits of batteries which can increase the cycle count of batteries significantly

-Pin lock so the user can lock the powerbank from unauthorized use

-Adjustable output voltage and current also from the USB C port