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Arduino Compatible Fingerprint Scanner - TTL (GT-521F32)

Arduino Compatible Fingerprint Scanner - TTL (GT-521F32) - Sensor - Arduino
Arduino Compatible Fingerprint Scanner - TTL (GT-521F32) - Sensor - Arduino
Out Of Stock
Arduino Compatible Fingerprint Scanner - TTL (GT-521F32) - Sensor - Arduino
Arduino Compatible Fingerprint Scanner - TTL (GT-521F32) - Sensor - Arduino
Arduino Compatible Fingerprint Scanner - TTL (GT-521F32)

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  • SKU: FR-01-556
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Fingerprint scanners are awesome! Why use a key when you have one right at the tip of your finger? Unfortunately, they’re often unreliable or difficult to implement. Well not anymore! This great GT-521F32 fingerprint module from ADH-Tech communicates over TTL Serial so you can easily embed it into your next project. The module itself does all of the heavy liftings behind reading and identifying the fingerprints with an onboard optical sensor and 32-bit ARM Cortex M3 processor.

To get started, just register each fingerprint that you want to store by sending the corresponding command and pressing your finger against the reader three times. The fingerprint scanner can store different fingerprints, and the database of prints can even be downloaded from the unit and distributed to other modules. In addition to the fingerprint “template,” the analyzed version of the print, you can retrieve the image of a fingerprint and even pull raw images from the optical sensor!

This module is the economical version of the GT-521F52 and can store up to 200 different fingerprints. It is capable of 360° fingerprint recognition and download/upload templates using the serial interface. Additionally, the GT-521Fxx series features a resolution of 450dpi, with a false acceptance rate of <0.001% and a false rejection rate of <0.1% while only needing <1.5 seconds to identify a unique fingerprint!

The module is small and easy to mount using four mounting holes surrounding the sensor. The onboard JST-SH connector has four signals: Vcc, GND, Tx, and Rx. A compatible JST-SH pigtail can be found in the Hookup Accessories section below.

Note: Please be aware that even though this fingerprint scanner is equipped with the same connector we use on all of our Qwiic boards, it is NOT Qwiic or I2C compatible. That being said, all of our Qwiic cables, like our 100mm version, will work for this board.


  • Simple UART & USB communication protocol
  • Complies with USB 2.0 full-speed specification
  • Ultra-thin optical sensor
  • Wake up on Finger Function
  • Works well with dry, moist or rough fingerprints
  • Anti-scratch with surface high hardness? 5H
  • High-accuracy and high-speed fingerprint identification technology
  • 4x mounting holes
  • 2x JST SH connectors



Technical SpecsGT-521F32 
CPUARM Cortex M3 Cortex
Enrollment Time< 3 sec (3 fingerprints)
Effective Area of the Sensor14mm x 12.5mm
Image Size258×202 Pixels
Serial CommunicationUART (Default: 9600 baud) and USB v2.0 (Full Speed)
Max of Fingerprints200 
Matching Mode1:1, 1:N
Size of Template496 Bytes(template) + 2 Bytes (checksum)
False Acceptance Rate (FAR)< 0.001%
False Rejection Rate (FRR)< 0.01%
Resolution450 dpi
Identification Time<1.5
Operating Voltage3.3V ~ 6Vdc
Operating Current< 130mA
Touch Operating Voltage3.3Vdc
Touch Operating Current< 3mA
Touch Standby Current< μ5
Datasheet and Guide: Download


Package Content:

1 x Fingerprint Scanner - TTL (GT-521F32)

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CPUARM Cortex M3 Cortex
Enrollment Time< 3 sec (3 fingerprints)
False Acceptance Rate (FAR)< 0.001%
False Rejection Rate (FRR)< 0.01%
Identification Time<1.5 s
Image Size258×202 Pixels
Matching Mode1:1, 1:N
Max of Fingerprints200
Operating current< 130mA
Operating Voltage3.3V ~ 6V
Resolution450 dpi
Sensing area14mm x 12.5mm
Serial communication formatUART (Default: 9600 baud) and USB v2.0 (Full Speed)
Template size496 Bytes(template) + 2 Bytes (checksum)

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