C3 Optical Fingerprint Sensor Module
Compact UART Biometric Identification Module for Arduino & Security Systems
The C3 Optical Fingerprint Sensor Module is an all-in-one biometric access control solution that brings fast, reliable fingerprint identification to your embedded electronics projects. Powered by an onboard high-speed 32-bit ARM processor, this module handles all image capture, feature extraction, template storage, and biometric matching internally—eliminating complex processing overhead on your main microcontroller.
Featuring an integrated optical camera array, bright blue status LEDs, and a simple UART TTL serial interface, the C3 module allows you to store and verify up to 200 distinct fingerprint templates effortlessly.
Key Features
Onboard DSP Processing: High-speed internal processor executes fast 1:N fingerprint matching in under 1 second without overloading host microcontrollers.
Non-Volatile Storage: Built-in flash memory securely stores up to 200 fingerprint templates even when power is disconnected.
Simple UART Interface: Connects easily to Arduino, ESP32, Raspberry Pi, and STM32 boards using standard serial commands (TX/RX).
High Optical Accuracy: Optical sensor array with ~500 DPI resolution ensures precise ridge pattern scanning and low false-acceptance rates.
Built-In LED Illumination: Features integrated blue LEDs that illuminate the optical scanning surface during fingerprint reads for high-contrast imaging.
Flexible 3.3V / 5V Operation: Powered via a standard 3.3V–5V DC power supply, making it compatible with most hobbyist and industrial development boards.
Typical Applications
Biometric Door Access Control: Keyless entry locks, smart safes, and secure cabinet access.
Time & Attendance Tracking: Employee or student logging terminals for small business management.
Ignition & Power Authorization: Vehicle startup overrides, machinery safety switches, and restricted power relays.
Security & DIY Electronics: Custom biometric authentication for Arduino, Raspberry Pi, and ESP32 smart home systems.
Technical Specifications
| Parameter | Specification |
| Sensor Type | High-Resolution Optical Fingerprint Sensor |
| Processor | 32-Bit Onboard ARM Processor |
| Storage Capacity | Up to 200 Fingerprint Templates |
| Communication Interface | UART TTL Serial (Default 9600 bps baud rate) |
| Operating Voltage | 3.3V – 6.0V DC (5V recommended) |
| Working Current | <130 mA (Peak during scanning) |
| Matching Speed | <1.0 second (1:N matching) |
| False Acceptance Rate (FAR) | <0.001% |
| False Rejection Rate (FRR) | <0.1% |
| Dimensions / Window | Approx. 14 mm × 10.5 mm active window |
Pinout Connection Guide
| Pin | Name | Function |
| 1 | VCC | Power Supply (3.3V – 5V DC) |
| 2 | TX | Serial Output (Connect to Microcontroller RX Pin) |
| 3 | RX | Serial Input (Connect to Microcontroller TX Pin) |
| 4 | GND | Ground (0V System Reference) |
Package Includes
1 × C3 Optical Fingerprint Sensor Module
1 × Wire Harness Cable Interface