Heart Rate 7 Click

Heart Rate 7 Click is an optical biosensor Click board™ which can be used for heart-rate monitoring (HRM). This Click board™ employs a very sensitive analog front-end IC with high dynamic range, which ensures accurate and reliable readings. This analog front-end IC is coupled with the optical front end, which consists of a sensitive photo-diode (PD) and two high brightness green LEDs.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Dec 2021.
• Type : I2C type

Software Support

We provide a library for the Heart Rate 7 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 Heart Rate 7 Click driver.

Standard key functions :

• heartrate7_cfg_setup Config Object Initialization function.

  void heartrate7_cfg_setup ( heartrate7_cfg_t *cfg );

• heartrate7_init Initialization function.

  err_t heartrate7_init ( heartrate7_t *ctx, heartrate7_cfg_t *cfg );

• heartrate7_default_cfg Click Default Configuration function.

  err_t heartrate7_default_cfg ( heartrate7_t *ctx );

Example key functions :

• heartrate7_write_reg Heart Rate 7 register write function.

  void heartrate7_write_reg( heartrate7_t *ctx, uint8_t reg_addr, uint32_t write_data ); 

• heartrate7_read_reg Heart Rate 7 register reading function.

  uint32_t heartrate7_read_reg( heartrate7_t *ctx, uint8_t reg_addr ); 

• heartrate7_sw_reset Heart Rate 7 software reset function.

  void heartrate7_sw_reset( heartrate7_t *ctx );

Example Description

This example showcases ability for device to read Heart Rate 7 Click Board.

The demo application is composed of two sections :

Application Init

Configures the micro controller for communication and initializes the Click board.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    heartrate7_cfg_t heartrate7_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.
    heartrate7_cfg_setup( &heartrate7_cfg );
    HEARTRATE7_MAP_MIKROBUS( heartrate7_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == heartrate7_init( &heartrate7, &heartrate7_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( HEARTRATE7_ERROR == heartrate7_default_cfg ( &heartrate7 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

This section shows how the data is processed and sent to the MikroPlot application.

void application_task ( void ) 
{
    sensor_value = heartrate7_get_aled1_val( &heartrate7 );
    log_printf( &logger, "%lu,%lu \r\n", sensor_value, time );
    time += 10;
    Delay_ms ( 10 );
}

Note

For testing this example application SerialPlot was used. There you can see heart rate graphicly shown.

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.HeartRate7

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.