Fingerprint 4 Click

Fingerprint 4 Click is an adapter Click board™ used to interface a compatible fingerprint sensor with the host MCU. This board features FINGERPRINTS BM-Lite Module, a complete biometric fingerprint solution ready to be used out-of-the-box. The BM-Lite Module combines superior biometric performance and a high standard of quality components to offer a comprehensive embedded solution for increased security and enhanced user convenience. It uses a 3D pixel sensing technology that can read virtually any finger, dry or wet, alongside simple serial commands with a configurable communication interface to enroll and verify. Its protective coating helps in protection against ESD, scratches, impact, and everyday wear and tear.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Sep 2022.
• Type : SPI type

Software Support

We provide a library for the Fingerprint 4 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Fingerprint 4 Click driver.

Standard key functions :

• fingerprint4_cfg_setup Config Object Initialization function.

  void fingerprint4_cfg_setup ( fingerprint4_cfg_t *cfg );

• fingerprint4_init Initialization function.

  err_t fingerprint4_init ( fingerprint4_t *ctx, fingerprint4_cfg_t *cfg );

Example key functions :

• fingerprint4_version This function reads out version information from the device. The response contains a variable length string that contains version information of the device.

  err_t fingerprint4_version ( fingerprint4_t *ctx, char *version, uint8_t len );

• fingerprint4_identify_finger This function captures and identifies finger against existing templates in Flash storage.

  err_t fingerprint4_identify_finger ( fingerprint4_t *ctx, uint32_t timeout, uint16_t *template_id, bool *match );

• fingerprint4_wait_finger_not_present This function waits until no finger is detected on the sensor.

  err_t fingerprint4_wait_finger_not_present ( fingerprint4_t *ctx, uint32_t timeout );

Example Description

This example demonstrates the use of the Fingerprint 4 Click boards by registering 3 fingerprints and then waiting until a finger is detected on the sensor and identifying if the fingerprint matches one of those stored in the Flash storage.

The demo application is composed of two sections :

Application Init

Initializes the driver and reads the sensor firmware version, then resets the sensor and removes all stored fingerprint templates. After that it registers 3 new fingerprint templates and stores them in the Flash storage.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    fingerprint4_cfg_t fingerprint4_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    fingerprint4_cfg_setup( &fingerprint4_cfg );
    FINGERPRINT4_MAP_MIKROBUS( fingerprint4_cfg, MIKROBUS_1 );
    if ( FINGERPRINT4_RES_OK != fingerprint4_init( &fingerprint4, &fingerprint4_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    fingerprint4_reset_device ( &fingerprint4 );

    fingerprint4.phy_rx_timeout = FINGERPRINT4_DEFAULT_PHY_RX_TIMEOUT_MS;

    uint8_t version[ 50 ] = { 0 };
    if ( FINGERPRINT4_RES_OK == fingerprint4_version ( &fingerprint4, version, 50 ) )
    {
        log_printf( &logger, " FW version: %s\r\n", version );
        log_printf( &logger, "---------------------------------\r\n\n" );
    }

    fingerprint4_error_check( "Sensor reset", fingerprint4_sensor_reset ( &fingerprint4 ) );

    fingerprint4_error_check( "Remove all templates", fingerprint4_template_remove_all ( &fingerprint4 ) );

    fingerprint4_register_fingerprints ( &fingerprint4, LOCATION_IN_FLASH, NUMBER_OF_FINGERPRINTS );

    log_info( &logger, " Application Task " );
}

Application Task

Waits until a finger is detected on the sensor, takes an image of the finger and checks if there's a fingerprint in the library that matches the one it has just read. If it finds a match, a fingerprint template ID will be displayed. All data is being logged on the USB UART where you can track the program flow.

void application_task ( void )
{
    uint16_t template_id;
    bool match;
    log_printf( &logger, " Put your finger on the sensor.\r\n" );
    err_t error_flag = fingerprint4_identify_finger ( &fingerprint4, FINGERPRINT4_INFINITE_TIMEOUT, &template_id, &match );
    if ( error_flag )
    {
        fingerprint4_error_check( "Identify finger", error_flag );
    }
    else
    {
        if ( match )
        {
            log_printf( &logger, " >>>>> Fingerprint MATCH - Template ID: %u <<<<<\r\n", template_id );
        }
        else
        {
            log_printf( &logger, " >>>>> NO MATCH in the library <<<<<\r\n" );
        }
    }
    log_printf( &logger, " Lift the finger of the sensor.\r\n" );
    fingerprint4_wait_finger_not_present ( &fingerprint4, FINGERPRINT4_INFINITE_TIMEOUT );
    log_printf( &logger, "---------------------------------\r\n\n" );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Fingerprint4

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.