DZ392/pcb-projectThis is a small 4-port USB hub built into a butterfly-shaped PCB. Instead of using a cable like most USB hubs, it plugs directly into the side of a laptop.
USB FINAL is an open-source printed circuit board by DZ392, from the DZ392/pcb-project repository on GitHub. It is a 2-layer board of 70.5 × 55 mm with 19 parts on 23 nets, routed with 200 tracks and 30 vias.
It is built around the SL2.1S, GT-USB-7010ASV and U-G-O4DD-W-1. Its parts include 10 capacitors, 4 resistors and 2 ICs.
🦋 Butterfly USB Hub Dongle
This is a small 4-port USB hub built into a butterfly-shaped PCB. Instead of using a cable like most USB hubs, it plugs directly into the side of a laptop.
I wanted to make something a more compact usb that can be used for anything I need, so I designed mine as a dongle and I wanted it to work with newer laptops that mostly use USB-C as well as older ones that still have USB-A.
The board has a male USB-C connector and a male USB-A connector for the laptop side. You only use one of them at a time depending on what port your laptop has.
I also wanted the PCB itself to be part of the design rather than just a rectangular board, so I shaped it like a butterfly and plan to add a UV-printed gradient design to it as a challenge.
The PCB is 1.2 mm thick to work with the edge-mount USB connectors.
Why I Made It
I use devices with both USB-A and USB-C, and I thought it would be useful to have one small hub that could plug into either type of laptop without needing another adapter or cable. I also wanted to try designing my first PCB for practice.
I started by following the Macondo USB hub tutorial to understand how a USB hub circuit works. From there, I changed the design, I added both USB-C and USB-A upstream connectors, changed it into a direct-plug dongle, designed the butterfly-shaped PCB, and added my own visual design.
This project has also helped to learn KiCad and understand how the schematic, PCB layout, footprints, connectors, and physical board shape all have to work together.
How to Use It
| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 1 uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C3, C4, C6, C11, C18, C19 |
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C5, C7 |
| 2 | 5.1 kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R6 |
| 1 | 56 kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 56kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | AF 90° WJDG | easyeda2kicad:USB-A-TH_AF-WJDG | USB7 |
| 1 | GT-USB-7010ASV | easyeda2kicad:USB-C-SMD_G-SWITCH_GT-USB-7010ASV | U3 |
| 1 | SL2.1S | easyeda2kicad:SSOP-16_L4.6-W2.6-P0.53-LS4.0-BL | U2 |
| 1 | TYPE-C 16PIN 2MD | easyeda2kicad:USB-C-SMD_TYPE-C-16PIN-2MD-073 | USB1 |
| 1 | U-G-04DD-W-01 | easyeda2kicad:USB-A-TH_U-G-04WD-W-01 | USB10 |
It measures 70.5 × 55 mm and has 2 copper layers, 1.6 mm thick.
19 parts, built around the SL2.1S, GT-USB-7010ASV and U-G-O4DD-W-1. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the DZ392/pcb-project repository on GitHub, at the commit this page was made from: the board is USB FINAL.kicad_pcb and its schematic USB FINAL.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask DZ392 before reusing the design.
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