Name: R503 RGB Ring Capacitive Fingerprint Module
Brand: Alphatronic
SKU: UB12
Availability: InStock

The R503 Circular Capacitive Fingerprint Module is an all-in-one biometric sensor built for makers and developers who want to add secure, reliable fingerprint authentication to their projects. Unlike optical scanners that simply capture a light-reflected image, this capacitive fingerprint sensor measures the electrical charge differences across finger ridges and valleys, delivering higher accuracy and stronger resistance to fake prints or spoofing attempts. Housed in a rugged round metal body with a built-in RGB LED ring, the module gives clear visual feedback during scanning and can be configured to different colors for status indication, making it a great fit for access control systems, smart locks, safes, attendance devices, and other embedded security applications.

Inside the module is an integrated DSP chip that handles image capture, feature extraction, template generation, and matching entirely onboard, so your microcontroller just needs to send simple UART commands rather than doing any heavy image processing itself. It connects easily to Arduino, ESP32, Raspberry Pi, and most other microcontroller platforms via a 6-pin connector, and supports both 1:1 verification and 1:N identification against up to 200 stored fingerprints in onboard flash memory. With fast scan speed, low working current, and a compact panel-mountable design, the R503 is a dependable choice for anyone building a fingerprint-based lock, door entry system, or biometric authentication device.