R503 fingerprint module

R503 Fingerprint Module – Circular Capacitive Fingerprint Sensor / Scanner with Key & 2-Color LED Ring The R503 Fingerprint Module is a compact circular capacitive fingerprint identification and recognition sensor designed for biometric authentication and security applications. It can be integrated with Arduino, ESP32, STM32 and other microcontroller systems through a serial UART interface. The R503 features a built-in key/button for user interaction and a 2-color LED ring indicator that provides visual status feedback. Its compact circular design makes it ideal for fingerprint door locks, access control systems, attendance machines, smart lockers, electronic safes, IoT security systems and DIY biometric projects. Specifications Model: R503 / R-503 Type: Capacitive Fingerprint Identification Module Sensor: Circular fingerprint sensor Fingerprint Recognition: Yes Communication: UART / TTL Serial Control: Serial AT/command interface Indicator: 2-color LED ring Built-in Key: Yes Operating Voltage: Typically 3.3V Interface: Serial UART Application: Biometric identification and authentication Key Features Circular capacitive fingerprint sensor Fast fingerprint detection and identification Built-in key/button for user operation 2-color LED ring status indicator UART serial communication Compact and easy-to-install design Suitable for Arduino and ESP32 projects Useful for biometric access-control applications Suitable for DIY security and automation projects Applications Fingerprint door lock systems Biometric access control Fingerprint attendance systems Smart lockers and cabinets Electronic safes Security systems Arduino fingerprint projects ESP32 fingerprint projects IoT biometric security Home automation Fingerprint authentication systems DIY biometric identification projects SEO Search Keywords R503 fingerprint module, R503 fingerprint sensor, R503 fingerprint scanner, R-503 fingerprint module, circular fingerprint sensor, capacitive fingerprint sensor, fingerprint identification module, fingerprint reader module, biometric fingerprint sensor, UART fingerprint sensor, Arduino fingerprint sensor, ESP32 fingerprint sensor, fingerprint door lock module, fingerprint access control module, fingerprint attendance module, biometric security sensor, fingerprint scanner module.