Digital Logic is a Serbia-based electronics maker focused on NFC/RFID reader-writer hardware aimed at developers and system integrators building time attendance, access control, and vending stack. Their flagship µFR Zero Online is an OEM-sized reader that pairs a 13.56 MHz multi-ISO NFC front end (ISO14443 A/B and ISO15693) with an ESP32-S3 module for Wi-Fi and BLE, plus wired options like Ethernet and Power over Ethernet for clean single-cable setup. https://www.d-logic.com/ufr-zero-online-series-multi-protocol-network-nfc-rfid-readers-writers/
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A key idea in this demo is “tap, then authenticate”: NFC is used for near-field intent detection, and then Bluetooth can wake only when a phone is close, enabling a proximity-based exchange that feels like a single interaction to the user. With a custom app, the phone and reader can establish a secure channel, pass signed data, and treat the handset like a credential without exposing raw identifiers in view.
The broader µFR Zero lineup is intentionally modular: round housings, quarter-card (QS), half-card (HS), and larger antenna variants share the same integration philosophy while trading size for RF field strength. In the booth walkthrough recorded at Embedded World North America 2025, they show how antenna geometry maps to practical read ranges, roughly from about 10 cm on the compact unit to around 17 cm, up to about 30 cm on the XL format.
For system builders, the appeal is deployment flexibility: Wi-Fi/BLE for retrofits, Ethernet/PoE for fixed installs, and developer-friendly interfaces like USB CDC/HID, UART/SPI, and event streaming over network protocols. Add-ons such as touch displays, SD storage, GPIO/relays, and secure-element or SAM-style modules let integrators tune security posture, offline logging, and UX without redesigning the core.
A concrete example is self-serve beverage walls, where a prepaid NFC card or phone credential meters dispensing while a back end decrements credit in real time. That “reader as a networked edge node” pattern generalizes to ticketing, lockers, kiosks, and industrial access points, where the same device can handle identity, policy checks, and telemetry in a compact embedded stack.
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