R305 Fingerprint Sensor Module – Optical Fingerprint Scanner with TTL UART Interface
Product Description
The R305 Fingerprint Sensor Module is an optical biometric fingerprint recognition module designed for secure identification and authentication applications. It combines an optical fingerprint reader, image-processing capabilities, and an onboard fingerprint recognition algorithm in a compact unit.
The module captures fingerprint images, processes them, and stores fingerprint templates in its internal memory. It supports both 1:1 verification and 1 identification, allowing a registered fingerprint to be verified against a selected template or searched against the stored fingerprint database.
With its TTL UART communication interface, the R305 can be connected to compatible microcontrollers such as Arduino, ESP32, and other embedded development boards. It is suitable for electronic door locks, attendance systems, access-control projects, and biometric security applications.
Key Features
Optical Fingerprint Recognition: Captures fingerprint images using optical sensing technology.
Onboard Processing: Integrates fingerprint image collection and recognition processing.
Internal Memory: Stores fingerprint templates for user identification.
Two Matching Modes: Supports 1:1 verification and 1 identification.
TTL UART Interface: Communicates with compatible microcontrollers through serial communication.
Microcontroller Compatible: Suitable for Arduino and other TTL UART-compatible controllers.
Fast Image Capture: Fingerprint image acquisition time specified as less than 0.5 seconds.
Compact Design: Suitable for embedded biometric security systems.
Adjustable Communication Speed: Supports configurable UART baud rates.
Secondary Development Support: Can be integrated into custom electronic products and access-control systems.
Technical Specifications
Parameter | Specification |
Product Name | R305 Fingerprint Sensor Module |
Sensor Type | Optical Fingerprint Scanner |
Interface | TTL UART |
Additional Interface | USB 1.1 (as listed in supplied specifications; verify board version) |
Operating Voltage | 3.6 V–6.0 V |
Working Current | Approximately 100 mA |
Peak Current | Approximately 150 mA |
Matching Modes | 1:1 and 1 |
Default Baud Rate | 57600 bps |
Baud Rate Configuration | (9600 × N) bps, N = 1–12 |
Character File Size | 256 bytes |
Template Size | 512 bytes |
Fingerprint Storage | 120 templates (verify actual module variant) |
Image Acquisition Time | Less than 0.5 seconds |
Security Level | 1–5 (5 is highest) |
False Acceptance Rate (FAR) | Less than 0.001% (as specified) |
False Rejection Rate (FRR) | Less than 0.1% (as specified) |
Average Search Time | Less than 0.8 seconds (specified for 1:880 search) |
Fingerprint Window Size | 18 mm × 22 mm |
Applications
Biometric door-lock systems
Electronic access-control systems
Employee attendance systems
Fingerprint-based security devices
Smart lockers and cabinets
Arduino fingerprint recognition projects
ESP32 biometric authentication projects
Password-free authentication prototypes
Embedded security and automation systems
Educational electronics and STEM projects
Package Includes
1 × R305 Fingerprint Sensor Module
Important Notes
The supplied specifications mention a storage capacity of 120 templates, while some R305 product descriptions list different capacities. Confirm the actual module's capacity with the supplier before publishing a guaranteed number.
The supplied R305/R307 comparison lists different storage capacities and interface features. These specifications can vary by module version; do not assume R307 specifications apply to R305.
The module uses TTL UART signals. A suitable level converter may be required when connecting it to equipment with incompatible serial voltage levels.
The listed operating voltage does not automatically mean that every signal pin is 5 V tolerant. Check the module documentation before connecting it to a microcontroller.
A USB connection to a PC may require a compatible USB-to-TTL adapter, depending on the actual board version.
FAR and FRR values are manufacturer-specified figures and may vary with fingerprint quality, installation, and operating conditions.
