Heart rate 6 Click

Heart rate 6 Click is an optical biosensor Click board™ designed for heart-rate monitoring (HRM). This Click board™ employs a specialized sensor that incorporates two LED drivers and photo-sensing elements which are the most sensitive to green light.

Click Product page

Click library

• Author : MikroE Team
• Date : Dec 2019.
• Type : I2C type

Software Support

We provide a library for the HeartRate6 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for HeartRate6 Click driver.

Standard key functions :

• Config Object Initialization function.

  void heartrate6_cfg_setup ( heartrate6_cfg_t *cfg );

• Initialization function.

  HEARTRATE6_RETVAL heartrate6_init ( heartrate6_t ctx, heartrate6_cfg_t cfg );

• Click Default Configuration function.

  void heartrate6_default_cfg ( heartrate6_t *ctx );

Example key functions :

• Function reads the LED Data as 16bit unsigned value.

  void heartrate6_get_data ( heartrate6_t ctx, uint16_t led_off_data, uint16_t *led_on_data );

• Function sets the data reading frequency and the LED pulse frequency.

  void heartrate6_set_freq ( heartrate6_t *ctx, uint8_t freq_data );

• Function starts measurement cycle.

  void heartrate6_start_measure ( heartrate6_t *ctx );

Examples Description

The example demonstrates the use of Heart rate 6 Click board.

The demo application is composed of two sections :

Application Init

Initializes interface and performs the device configuration and reset.

void application_init ( void )
{
    log_cfg_t log_cfg;
    heartrate6_cfg_t cfg;

    /** 
     * 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.

    heartrate6_cfg_setup( &cfg );
    HEARTRATE6_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    heartrate6_init( &heartrate6, &cfg );
    Delay_ms ( 500 );

    heartrate6_default_cfg( &heartrate6 );
    log_printf( &logger, " Heart rate 6 is initialized. \r\n");
    Delay_ms ( 500 );
}

Application Task

Waits until measurement cycle is finished and data is ready for reading. Then reads the LED data and performs the data plotting on USB UART.

void application_task ( void )
{
    heartrate6_wait_measure( &heartrate6 );

    heartrate6_get_data( &heartrate6,  &led_data_off, &led_data_on );

    counter++;
    if ( led_data_off < 200 )
    {
        log_printf( &logger, "%u;\r\n", led_data_on );
        counter = 200;
    }
    else if ( counter > 200 )
    {
        log_printf( &logger, "Please place your index finger on the sensor.\r\n" );
        counter = 0;
    }
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.HeartRate6

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.