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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 Capacitive Fingerprint Reader (B) by Waveshare is a module for secondary development with UART and USB interfaces. It supports fingerprint enrollment, matching, and storage via simple commands.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20679 WSAL20679 – High precision Capacitive Fingerprint Reader (B), UART/USB dual ports]

== Technical overview ==
* Sensor: semiconductor-based, capacitive; image resolution 208 x 288 pixels at 508 DPI, 8-bit grayscale
* Storage capacity: 3000 stored templates
* Security level 1–5 configurable (default 3); higher level lowers FAR but raises FRR
* Communication: UART or USB (Type-C); default baud rate 115200 bps, configurable from 9600 to 921600 bps
* Operating voltage 3.3–5 V; dynamic current <40 mA, sleep current <4 mA
* Module dimensions: 34 x 28.5 mm; sensing area 14.6 x 10.6 mm
* Command set CMD0–CMD9 for connection test, detection, enrollment, deletion, 1:1 and 1:N verification, empty ID lookup, image upload/download
* Raspberry Pi wiring: TXD→RXD, RXD→TXD, RST→GPIO5 (low active)
* Arduino wiring: TXD→pin 10, RXD→pin 11, RST→pin 9
* STM32 wiring: TXD→PA10, RXD→PA9, RST→PB5

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
CMD0: Prüfen, ob der Fingerabdruckleser korrekt verbunden ist
CMD1: Prüfen, ob ein Finger erkannt wird
CMD2: Fingerabdruck hinzufügen (Anlernen)
CMD3: Gespeicherten Fingerabdruck löschen
CMD4: 1:1-Verifikation eines Fingerabdrucks
CMD5: 1:N-Verifikation gegen alle gespeicherten Abdrücke
CMD6: Nächste freie ID ermitteln
CMD7: Anzahl der gespeicherten Abdrücke abfragen
CMD8: Fingerabbild vom Lesegerät auf den Host hochladen
CMD9: Fingerabbild vom Host zum Lesegerät herunterladen
Baudrate auf 115200 setzen: 55 AA 00 00 02 00 05 00 03 05 00 00 00 00 00 00 00 00 00 00 00 00 00 0e 01
Baudrate auf 57600 setzen: 55 AA 00 00 02 00 05 00 03 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0d 01
Erfolgreiche Antwort nach Baudratenänderung: AA 55 01 00 02 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 01
</syntaxhighlight>

== Notes and version constraints ==
* The source contains placeholders such as {{{name2}}} and {{{userDefinedInfo}}}; these were ignored as they are not valid data.
* When using the USB interface, a suitable Type-C cable is required; the source does not specify a particular cable type beyond 'Type-C'.
* For UART connection to a PC, a separate USB-to-UART adapter is needed – the source does not state whether it is included.
* Error codes and return values are version-sensitive; exact hex values should be verified before deployment.
* The source mentions 'Open103Z' as an example board; compatibility with other boards is not stated.
* Per the source, Arduino does not support CMD8/CMD9 due to memory limits; packet loss may occur at 115200 bps.
* Detailed specifications, certifications, warranty, or safety certifications are not present in the source and must not be assumed.

== Source and revision record ==
* [https://www.waveshare.com/wiki/Capacitive_Fingerprint_Reader_(B) Capacitive Fingerprint Reader (B) - Waveshare Wiki]
* Source revision: 80545
* Captured: 2026-09-02T04:11:07+00:00
* SHA-256: <code>b5616b74310db319485f00763a7f4e52e1ece8d6dce18e7d0b5f81a92623c1d5</code>

WSAL20679 – Capacitive Fingerprint Reader (B)/en - Versionsgeschichte

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