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2026-09-05T22:38:43Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The 7.5-inch NFC-powered e-Paper V2 is a battery-free display system: image content is transmitted wirelessly via NFC from a compatible smartphone or an ST25R3911B reader and shown on the 800×480 screen.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL17766 WSAL17766 – 7.5inch NFC-Powered e-Paper V2 Evaluation Kit, Wireless Powering & Data Transfer]
* [https://shop.jw-tech.eu/p/WSAL30537 WSAL30537 – 7.5inch Passive NFC-Powered e-Paper V2, No Battery, Wireless Powering &amp; Data Transfer]

== Technical overview ==
* Resolution 800×480; dot pitch 0.205 × 0.204 mm; black-and-white display with >170° viewing angle
* Powered exclusively by NFC; no battery required; last displayed content remains visible without power
* Housing made of ABS plastic with good strength and toughness
* Android app requires Android 4.0 (Ice Cream Sandwich) or later; according to the source the app does not support Samsung, Google, or Sony phones
* iOS users install the “NFC E-Tag” app from the App Store
* ST25R3911B NFC board connects to a PC or 5V supply via Micro USB; images can be refreshed from a TF card or through serial transmission
* Rev2.2 replaces the motherboard NFC chip and uses a fast flashing method for the display; update the mobile app and board program before use
* Example applications listed in the source: equipment labels, shelf labels, and information storage

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
ST25R3911B: Programm am SW-Download-Anschluss flashen, dann Micro-USB mit PC verbinden
ST25R3911B: Monochromes BMP auf TF-Karte kopieren und im Kartensteckplatz einlegen
ST25R3911B: 5-V-Stromversorgung an den USB-Anschluss des Boards anschließen
ST25R3911B: Im Menü „Update E-paper SD“ wählen, Bild auswählen (Auflösung muss zum Display passen), bestätigen
ST25R3911B: Alternativ „Update E-paper UART“ wählen und BMP-Bild über seriellen Anschluss senden
ST25R3911B: Spule des Lesegeräts nahe der Mitte des NFC-E-Papers positionieren und Aktualisierung abwarten
</syntaxhighlight>

== Notes and version constraints ==
* The source provides no exact command-line commands; the steps above are derived from the wiki and must be confirmed by a technician before production use.
* Compatibility: According to the source, the Android app does not support Samsung, Google, or Sony devices; phone NFC must be enabled and the device must not move during transmission.
* Rev2.2 is version-sensitive: update the latest app and the ST25R3911B program before use.
* Operating conditions per source: 0–50 °C, humidity 35–65% RH; storage below 30 °C, below 55% RH, up to 6 months; transport −25–70 °C, up to 10 days; after unpacking 20 °C ±5 °C, 50 ±5% RH, assemble within 72 hours.
* Password protection: default password is 1234; remember it if changed.
* Missing context: The source gives no certifications, warranty, price, or stock information.

== Source and revision record ==
* [https://www.waveshare.com/wiki/7.5inch_NFC-Powered_e-Paper 7.5inch NFC-Powered e-Paper - Waveshare Wiki]
* Source revision: 103681
* Captured: 2026-09-01T02:39:43+00:00
* SHA-256: <code>51040e7cdc867610cc0b9a74d5b134605d8d83d60a43b2598944a159bd16e70b</code>

WSAL17766 – 7.5inch NFC-Powered e-Paper/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex