FingerPrint Click is a compact add-on board that interfaces a biometric security sensor with the host MCU. This board features the GTS-511E2 module from ADH Technology, one of the world's thinnest optical touch fingerprint sensors. The GTS-511E2 combines superior biometric performance and a high standard of quality components to offer a comprehensive embedded solution for increased security and enhanced user convenience. Besides a high C/P ratio, DPI without image distortion, and a unique surface design for dry fingers, the GTS-511E2 is also characterized by resistance to 2D fake fingerprints, a selectable interface, USB, and more. This Click board™ is suitable for a wide range of biometric security applications.
FingerPrint Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.
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FingerPrint Click is based on the GTS-511E2 module, one of the world's thinnest optical touch fingerprint sensors, from ADH Technology. It is one of the simplest ways to integrate biometric security into your design, where the fingerprint takes a digital image of the fingerprint pattern using visible light. The Fingerprint Click features a VGA CMOS image sensor in a plastic housing with image resolutions of 860 DPI for VGA, with an effective sensing area of just 12 x 14mm and very low TV distortion. The image sensor has an 8bit/pixel image grayscale, with a maximum 256 gray level. Considering how dark it is when a finger presses the lens, an LED illuminates it from one side while the other sends the image through the lens to the processor.
This Click board™ carries an STM32F415RG MCU for processing the images and forwarding them to an external MCU or a PC. One of two interfaces can be used with the host MCU over the mikroBUS™ socket, SPI or UART, where an SPI serial interface is predefined. Also, the STM32 has its data-ready pin labeled as RDY and routed to the AN pin of the mikroBUS™ socket used as an interrupt to inform our host MCU when it has data ready for further processing. Alongside a Reset button for the general reset feature of the FingerPrint Click, there are also two LED indicators, DATA and STAT, for status indication, a JTAG header for upgrading an STM32 MCUs firmware, and an unpopulated GPIO header that gives access to I2C, SPI, and UART interfaces of the companion STM32 MCU.
The onboard STM32 MCU comes with the USB HID Bootloader that comes in handy for using this board as a stand-alone device, along with the Mini-B USB connector and our created application available on Libstock. After five seconds, the PC will recognize this Click board™ as Mikroe’s USB HID Bootloader when connected to the PC. The following steps describe how the application works:
The application offers different CMOS image sensor settings, such as exposure or global gain.
This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
Can be used for a wide range of biometric security applications.
GTS-511E2 – optical touch fingerprint sensor from ADH Technology
STM32F415RG – Arm Cortex-M4 core MCU from ST Microelectronics
Out-of-the-box solution, superior performance, high component standard, increased security and user convenience, configurable interface, onboard STM32F415RG MCU, mini-B USB connector, additional GPIO pins, and more
Click board size
L (57.15 x 25.4 mm)
This table shows how the pinout on FINGERPRINT Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
|STM32 Data Ready||RDY||1||AN||PWM||16||NC|
|SPI Chip Select||CS||3||CS||RX||14||TX||UART TX|
|SPI Clock||SCK||4||SCK||TX||13||RX||UART RX|
|SPI Data OUT||SDO||5||MISO||SCL||12||NC|
|SPI Data IN||SDI||6||MOSI||SDA||11||NC|
|LD1||STAT||-||Status LED Indicator|
|LD2||DATA||-||Data Processing LED Indicator|
|LD3||PWR||-||Power LED Indicator|
|J1-J2||UART||Unpopulated||UART Interface Selection|
|J3-J6||SPI||Populated||SPI Interface Selection|
|CN4||JTAG||-||JTAG Interface Header for STM32 MCU|
|CN5||GPIO||-||User-Configurable GPIO Header|