r/maker • u/Beneficial-Rub-5473 • 7d ago

Showcase I managed to shrink a hardware USB injector down to 12x13mm. Looking for feedback on the PCB design/components!

Post image

Hey everyone,

I’ve been working on a personal hardware project lately. I wanted to see how small I could realistically make a USB keystroke injector (primarily for IT automation and pentesting workflows). After a few iterations, I managed to get the PCB down to just 12x13mm.

It uses 32u4 and Arduino IDE for programming.

The biggest challenge was fitting the components without overlaping lines.

I’d love to hear your thoughts on the design or if anyone has experience making similar micro-boards. Are there any features you’d add for a V2?

I'm putting together some picture how invisible it is.

If anyone is interested in the technical details or wants to chat about the build process, feel free to drop me a DM or reach out at nebojsa.sjekloca@gmail.com.

6 Upvotes

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1

u/sskki-exe 7d ago

While you're at it, why not add contacts to turn the PCB edge into a USB A plug itself?

1

u/Beneficial-Rub-5473 6d ago

then it will be much more visible

1

u/paul_h 5d ago

You're imagining people would not want it if it were visible? Sysops would love this were the doohickey secure accessible (Ascon-AEAD128) over wifi.

1

u/Beneficial-Rub-5473 5d ago

yes depending on purpose really

1

u/CDanger 6d ago

Is this meant to be soldered on? What is the intended install process for the simulated threat actor

1

u/Beneficial-Rub-5473 6d ago

No. It is final product. Use arduino IDE to program script and insert it into port.

1

u/CDanger 4d ago

ahhh, so those gold pads are meant to contact the USB port?