Show HN: F32 – An Extremely Small ESP32 Board
17 comments
·November 19, 2025jacquesm
If you add another GPIO and make a silicone mold you could make an in-cable eavesdropper on USB connections that streams out the data via the wifi. That would be a pretty scary tool in the right circumstances.
atemerev
These cables can be bought for like $200 mostly legally.
tmpfs
This is a very cool experiment, even if the board doesn't end up being that practical (the antenna hack is going to be an ongoing issue I think) your documentation looks great at a glance!
pegor
Thank you! I agree, antenna definitely needs some improvement.
anyg
If it is a little bigger to incorporate a bigger chip antenna and some GPIO pins, it is going to be very useful for a lot of IoT projects!!
margalabargala
The XIAO series of ESP32s is exactly that.
They are 4x the size though, almost exactly double in both length and width.
PunchyHamster
there is plenty of those already and not all too hard to make yourself, see LilyGo T01-C3
Its of format of original ESP8 so you get serial + 3 IO pins
pegor
Definitely would be more functional with more of the GPIOs exposed.
forsalebypwner
If you want an ESP32 dev board with GPIOs exposed there are dozens (or hundreds, maybe thousands) of other options out there. It makes sense not to expose them when you're going for the smallest possible footprint.
Gys
> PCBWay does also offer assembly services
Seriously? For a tiny board like this also? Genuine question.
kube-system
yes, but they use a machine, they don't do it by hand.
ingen0s
Nice work, kudos!
NuclearPM
> This can be seen in my highly necessary depiction below.
I love this. Fun and insightful article. Thank you.
pegor
Thanks for checking it out!
Will-Reppeto
[flagged]
As part of a little research and also some fun I decided to try my hand at seeing how small of an ESP32 board I can make with functioning WiFi.