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
🔹 Operating Voltage: 4.2V – 6V
🔹 Current Consumption: ~50–80mA
🔹 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 → Microcontroller TX
🔵 Touch (optional) → Finger detection interrupt
🔄 Features
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) for easy coding
✅ Advantages
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