wilsonharper.net
Hardware
nfc business card
SHOW HN2026
How HN took it
8 positive, 11 neutral or asking, 0 mixed, 0 critical, out of 19 comments about the project. Thread score +0.43.
Execution: 2 for, 0 againstDocs: 2 for, 0 againstDesign: 1 for, 0 againstPricing: 1 for, 0 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Neat hack and impressive engineering
From 3 comments
What an incredibly neat hack, congratulations. In the 80's Motorola had a challenge-response system to open doors with badges that contained a good bit of circuitry that reminds…
jacquesm on HNMy wallet has enough NFC devices already trying to talk to each other. Still, a seriously neat piece of engineering!
Sorrel47 on HNcool project, especially as a bachelor student of EE!
danshagen on HN
Well-written write-up and open-sourced files
From 2 comments
Really great project, thanks for sharing and what a well done write-up! Also kudos for including the PCB, BOM, and code on GH with a permissive license.
chews on HNNice write up!
thenthenthen on HN
Objections
Escrow and crypto use cases seem more complicated than current systems
From 1 comment
Okay so everytime I need escrow I will have to do all this? And use a different account anyway? Does not seem more convenient than current systems. Seems like you're trying to…
altmanaltman on HN
Requests
Cheaper cards in small packs with custom LEDs and printed designs
From 1 comment
Really cool. I'd love to be able to order cheap ones in packs of 5 or 10, with custom led colors/locations/sizes/brightness, fitting into a printed card...
entrepy123 on HN
Audio playback via a piezo buzver
From 1 comment
For future PCB business card ideas: it would be dope if it can play audios. Gemini says you can power a piezo buzzer (causing a small bump on a PCB) w/ NFC (just enough power to…
yegle on HN
Questions
How the NFC power-harvesting physically works
From 1 comment
> I should explain how NFC works: Your phone emits a small magnetic field several times a second. An NFC card picks up on that field, making your phone act like a tiny wireless…
rramadass on HN
Cost per card at different volumes
From 1 comment
I would be really interested to know the cost per card, both at the single card volume as well as the 30 the author ended up getting.
cowthulhu on HN
Alternatives named
Hackaday business card MIDI keyboard
From 1 comment
Different idea: https://hackaday.com/2024/06/06/2024-business-card-challenge-tiny-midi-keyboard/
nielsole on HN