NFC Energy-Harvesting PCB Business Card with an MCU
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HN · launched Aug 28, 2026 · 231 upvotes (top 2%) · 0 views
Niche: open-source hardware and maker electronics · 180 launches, 3 in the last 7 days ▼ -73% · Explore this niche →
Category and tags
- Horizontal
- Hardware & robotics
- B2C
- Not AI
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 180 launches in open-source hardware and maker electronics →
Could you build this?
No This is physical hardware engineering requiring RF antenna tuning, passive energy harvesting circuit design, and microchip firmware development.
What it would actually take: The project requires KiCad PCB schematic design with strict impedance matching and loop antenna geometry for 13.56 MHz RF induction, integrated with an energy-harvesting PMIC (like NTAG I2C) and an ultra-low-power MCU (ATtiny412) running Charlieplexed LED firmware in C/Assembly. This demands electrical engineering, RF antenna design expertise, and hardware assembly/testing equipment.
Discussion
20 comments analyzed.
Competitors mentioned: Samsung cover with programmable chip display, NFC phone-based authentication, QR code checkout systems
Concerns raised: High manufacturing costs at low volumes ($8 per card), Fab houses treat different silkscreen designs as separate jobs, Limited practical retail adoption for crypto payment workflows, User experience complexity compared to existing payment systems, Two-step buying process and merchant trust issues
Feature requests: Cost reduction at higher order volumes (150+ units), Dynamic NFC card for lay-by/lay-away transactions, Integration with smart contracts for escrow payments, Key pair generation and exchange between cards, Card-based authentication for pickup orders
Competitors
Other products that read as similar to this one : 592 launches clear the similarity bar, closest 8 shown.
Attention rank: #22 of 593 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 296 days after the earliest competitor.
- flipper-mtools · github · 2026-10-06 · 15 upvotes · similarity 0.68
- ProvenMetal - Fast-turn, American made PCBs · yc · 2026-07-13 · 34 upvotes · similarity 0.59
- Open-source passive NFC tag that signs with ECDSA, verified on-chain · hn · 2026-09-15 · 9 upvotes · similarity 0.57
- Resin - Codex for electronics · yc · 2026-10-07 · 2 upvotes · similarity 0.56
- tinysd · github · 2026-10-24 · 78 upvotes · similarity 0.55
- Emula · github · 2026-10-20 · 15 upvotes · similarity 0.55
- Pdsink · hn · 2025-11-15 · 6 upvotes · similarity 0.53
- MCP for Ordering Assembled PCBs · hn · 2026-10-19 · 9 upvotes · similarity 0.51
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.