R307 Optical Fingerprint Sensor Module
Overview
Optical biometric fingerprint recognition module
Used for authentication & security systems
Built-in DSP processor + memory storage
Works with Arduino, ESP32, Raspberry Pi (UART interface)
Working Principle
Finger placed on optical glass surface
Sensor captures fingerprint image (500 DPI)
Internal processor extracts unique features (minutiae)
Data stored as template in memory
Matching done:
1:1 Verification
1:N Identification
Fully standalone biometric processing module
Key Specifications
4.2V 6V
Current Consumption: ~5080mA
Interface: UART (TTL Serial), USB support
Resolution: 500 DPI
Storage Capacity: Up to 1000 fingerprints
Verification Speed: ~0.2 sec
Scanning Time: <0.3 sec
FAR: <0.001%
FRR: <1%
Baud Rate: 57600 (default)
Pin Configuration
VCC 5V
GND Ground
TX Microcontroller RX
RX ><
High accuracy biometric authentication
Internal flash memory storage
Fast matching & response (<1 sec)
Supports enroll, delete, search functions
Compact and robust design
Low power consumption
Applications
Smart door locks
Attendance systems
Access control systems
IoT security projects
Voting machines
Safe lockers & authentication systems
Usage Tips
Clean sensor surface for accurate reading
Use stable 5V supply
Connect TX RX correctly
Enroll finger twice for better accuracy
Use libraries (like Adafruit) fli
Standalone processing (no heavy coding needed)
High accuracy and reliability
Large fingerprint storage
Easy UART communication
Limitations
Slightly higher cost than basic sensors
Requires proper enrollment process
Sensitive to dirty/wet fingers
Not suitable for harsh outdoor environments
Summary
Optical fingerprint recognition module with DSP
Stores and matches up to 1000 fingerprints
Communicates via UART (Serial)
Ideal for biometric security and access systems