USB Lipo Charger / Light
Table of Contents
The Result
As this project is still a work in progress, Iβm still waiting for the result :).
Check below for a render:

The Parts
The downloads/parts are listed below. If you look at the PCB on https://aisler.net/p/MXBBWTEF you have the convenient option to also order all the parts. Or you can try to get them via the searches below.
Amount | Part | Type | Datasheet | Links |
---|---|---|---|---|
1 | USB LiPo Light Rev3 | Β PCB | Β | πΎ πaisler.net |
1 | MCP73831 | U | π google | π aliexpress |
1 | MCP1700 3.3V | U | π google | π aliexpress |
1 | D1 SMD LED 1206 | D | Β | π aliexpress |
1 | D2 SMD LED 5730 | Β D | Β | Β π aliexpress |
1 | Β Switch | Β SW | Β | π aliexpress |
2 | JST XH | J | Β | π aliexpress |
2 | 4.7u | C | Β | π aliexpress |
2 | 1u | C | Β | π aliexpress |
1 | 470 | R | Β | π aliexpress |
1 | 10k | R | Β | π aliexpress |
The Schematics
My main motivation was, that I wanted to design a PCB that could be plugged straight into the USB port of your computer / charger, without using a cable or usb connector on the PCB.
First, I designed a simple symbol to represent the USB connection.
First, I designed a simple symbol to represent the USB connection.
This is the power circuit, using the design from the datasheet of the MCP1700.
I added a switch, a LED and a Lipo + 3V3 out connector.
I added a switch, a LED and a Lipo + 3V3 out connector.
The PCB
I followed the discussion on this thread: https://forum.kicad.info/t/standard-github-usb-trace-on-pcb-footprint-available/1800 to find a USB A plug footprint. I imported it into my local library and assigned it to the USB A Plug symbol.
The view of the PCB in Kicad. I tried to be as symmetrical and organized as possible to simplify soldering, i.e. sort by value and same orientation of diodes.
I uploaded the PCB to https://aisler.net/p/MXBBWTEF to review it and order it.
The 3D Print
This is a TODO, and is waiting for the PCB / soldering.