GT-521F52 Optical Fingerprint Scanner Module – 3000 Fingerprint Capacity

Product Description

The GT-521F52 Optical Fingerprint Scanner Module is a compact and professional biometric identification module designed for fingerprint recognition, access control, attendance systems, smart locks, security devices, and embedded IoT applications.

Powered by an ARM Cortex-M3 microcontroller, the module performs fingerprint image processing, template management, enrollment, and matching internally. This reduces the processing workload on the connected microcontroller and allows the module to communicate using a simple command-based interface.

The module uses an optical fingerprint sensor with a high-hardness anti-scratch surface and a sensing resolution of 450 dpi. It is designed to provide reliable fingerprint image capture across a range of finger conditions, including relatively dry, moist, or rough fingerprints.

With storage for up to 3000 fingerprint templates, the GT-521F52 is suitable for applications requiring multiple-user biometric identification. It supports both 1:1 fingerprint verification and 1 fingerprint identification, allowing a stored fingerprint to be compared with a specific template or searched across the complete fingerprint database.

An integrated touch interface allows the sensor to detect contact with the metal frame and wake the module from standby. This can help reduce power consumption in applications where the scanner remains idle for extended periods.

For system integration, the module provides both UART communication and USB 2.0 full-speed connectivity. The UART interface supports communication with microcontrollers such as Arduino, ESP32, STM32, Raspberry Pi, and other compatible systems.

Features

• Professional optical fingerprint scanner module
• ARM Cortex-M3 onboard processing
• 450 dpi fingerprint sensing resolution
• Stores up to 3000 fingerprint templates
• Supports 1:1 fingerprint verification
• Supports 1 fingerprint identification
• Fast fingerprint identification
• 360° fingerprint recognition support
• Low False Acceptance Rate (FAR)
• Fast fingerprint enrollment
• Integrated touch-to-wake function
• Anti-scratch fingerprint sensor surface
• Optical fingerprint sensing technology
• UART communication interface
• USB 2.0 full-speed interface
• Supports template data management
• Supports fingerprint image data access
• Suitable for embedded biometric applications
• Low standby current for power-sensitive systems

Specifications

Working Principle

The GT-521F52 captures a fingerprint image using its integrated optical sensor. The onboard processor analyzes the fingerprint pattern and extracts the required biometric features.

During enrollment, the module processes the captured fingerprint and creates a digital fingerprint template. The template is stored internally in the module’s fingerprint database.

During verification, the newly scanned fingerprint can be compared against a selected stored template using 1:1 matching.

During identification, the scanned fingerprint can be searched against multiple stored templates using 1 matching to determine the matching user or fingerprint record.

The biometric processing is handled internally by the module, allowing the host microcontroller to communicate through commands instead of performing the complete fingerprint recognition algorithm itself.

Touch-to-Wake Function

The module includes an integrated touch detection function that can be used to wake the fingerprint sensor from standby.

When a finger touches the sensor’s metal frame, the touch interface can change the ICPCK pin from LOW to HIGH, allowing the host system or module logic to detect the touch event.

This function can be useful for battery-powered products where the scanner should remain in a low-power state until the user interacts with the sensor.

Communication Interface

The GT-521F52 supports both UART and USB 2.0 full-speed communication.

The UART interface provides a simple method for connecting the fingerprint scanner to compatible microcontrollers and embedded systems. The default UART baud rate is 9600 bps, with supported baud rates ranging from 9600 to 115200 bps.

The communication interface can be used for fingerprint enrollment, matching, template management, fingerprint image transfer, and other supported module commands.

Fingerprint Storage and Matching

The module can store up to 3000 fingerprint templates, making it suitable for applications requiring multi-user identification.

It supports:

• 1:1 Verification: Compares a fingerprint with a specified stored template.
• 1 Identification: Searches the fingerprint database for a matching fingerprint.
• Fingerprint Enrollment: Creates and stores new fingerprint templates.
• Template Management: Supports reading, writing, and managing stored fingerprint data.
• Fingerprint Image Access: Supports downloading fingerprint image data through supported communication commands.

Typical Application Scenarios

Access Control

Suitable for secure entry systems, biometric door locks, cabinets, restricted areas, and controlled access points.

Attendance Systems

Can be used for employee, student, or member attendance systems requiring fingerprint-based identification.

Smart Locks and Security Devices

Suitable for smart locks, lockers, safes, security boxes, and other products requiring biometric authentication.

IoT and Embedded Security

Can be integrated with Arduino, ESP32, STM32, Raspberry Pi, and other embedded controllers to create biometric IoT devices.

Safe and Locker Systems

Useful for secure storage systems where fingerprint recognition is required for user authentication.

Applications

• Fingerprint access control
• Biometric attendance systems
• Smart door locks
• Electronic lockers
• Safe boxes
• Security cabinets
• Smart home security
• Jewelry boxes
• IoT biometric systems
• Employee identification systems
• Student attendance systems
• Embedded security systems
• Arduino fingerprint projects
• ESP32 fingerprint projects
• Raspberry Pi biometric systems
• Industrial access control
• Custom biometric devices
• Security automation projects
• Educational biometric projects
• Embedded authentication systems

Package Includes

• 1 × GT-521F52 Optical Fingerprint Scanner Module

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual module may vary slightly in PCB colour, connector arrangement, sensor appearance, dimensions, component placement, or labeling depending on the manufacturing batch.

USB cables, Arduino boards, ESP32 boards, power supplies, mounting hardware, enclosures, and other accessories shown in product images are not included unless specifically mentioned in the package contents.

Biometric performance may vary depending on finger condition, environmental conditions, sensor cleanliness, installation, software configuration, and the quality of fingerprint enrollment.

Important Notes

Touch Function

The touch-to-wake function uses the ICPCK pin, which switches from LOW to HIGH when a finger touches the metal frame.

UART Connectivity

The UART interface supports baud rates from 9600 to 115200 bps, with 9600 bps specified as the default baud rate.

Power Supply

Use a suitable power source within the specified 3.3V to 6V DC operating range. Ensure that the power supply can provide sufficient current for stable operation.

Recommended Related Products

Explore relevant alternatives and complementary products selected from the full Robosap catalogue.

• R307s Optical Fingerprint Reader Sensor Module – UART Interface
• AS608 Optical Fingerprint Sensor Fingerprint Module
• HLK-FPM383F Mini Capacitive Fingerprint Sensor – 3.3V UART