This is a credit-card-sized portfolio/demo PCB combining a passive 13.56 MHz NFC business card, an Arduino-compatible barebones MCU, an 8×8 multiplexed LED display, and a reusable AP64501 3.3 V power-converter module on a 2-layer 85.6 × 53.98 mm board. The NFC section uses an NXP NT3H2111, a 40 mm/2.41 µH PCB antenna, provisional 7 pF tuning, and NFC energy harvesting for a status LED; the intended MCU functions are NFC access over I²C and LED-matrix animation, while QR graphics, large instructional text, and exposed circuit modules emphasize visual impact and portfolio value.

The principal trade-off is showcase density versus robustness: integrated PCB modules and a large matrix make the card impressive, but increase routing, power, firmware, and assembly complexity; multiplexing reduces GPIO and average power but requires drivers/current limiting and careful refresh timing, while antenna placement and nearby copper/components can degrade NFC range. As currently captured, it appears closer to a reusable demonstration/template than a production-ready product: NFC antenna connectivity and tuning need verification, I²C and matrix wiring are incomplete or ambiguous, matrix resistors/drivers are not evident, and the converter lacks a defined source/load path—priority improvements are to correct and measure the NFC network, complete named power and signal nets, add matrix current-control hardware, establish a realistic power budget, and run ERC/DRC plus physical NFC read-range testing.

I’m blocked because this project is view-only. Please fork it or grant edit access, then provide Tony Keeling’s title and preferred contact details; I’ll replace the branding with Tony Keeling / Bankside Consultancy and remove the QR code entirely.

I’ll create a fork in your account so you can edit it without changing the original.

I’ve forked it into your account: Open your editable copy. You can change the text, remove the QR code, and customize the design there—the original stays unchanged.