ECG GSR click

ECG GSR click is a complete solution for PPG, ECG and GSR application development, utilizing a specialized IC with a clinical-grade analog front-end (AFE) and electrical front-end. ECG GSR click uses the AS7030B IC, an ultra-low power, multi-channel bio-sensor, which features a wide range of different options, making it an ideal solution for development of blood oxygen level, heart rate and galvanic skin response monitoring applications, fitness applications, for the ECG bio-authentication, and similar applications related to heart monitoring. ECG GSR click is also equipped with the 3.5mm electrodes connectors, making it ready to be used out of the box.

click Product page

Click library

• Author : MikroE Team
• Date : Jan 2021.
• Type : I2C type

Software Support

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

Library Description

This library contains API for ECG GSR Click driver.

Standard key functions :

• Config Object Initialization function.

  void ecg_gsr_cfg_setup ( ecg_gsr_cfg_t *cfg );

• Initialization function.

  ecg_gsr_err_t ecg_gsr_init ( ecg_gsr_t ctx, ecg_gsr_cfg_t cfg );

• Click Default Configuration function.

  void ecg_gsr_default_cfg ( ecg_gsr_t *ctx );

Example key functions :

• Function performs reading of an ID of the device.

  void ecg_gsr_read_dev_id( ecg_gsr_t ctx, uint8_t register_address, uint8_t dev_id_out, uint8_t num_of_regs );

• Function writes 8-bit data to the register.

  ecg_gsr_err_t ecg_gsr_write_reg( ecg_gsr_t *ctx, uint8_t register_address, uint8_t transfer_data );

• Function performs the SW reset of the device and waits until the device returns back to normal state.

  void ecg_gsr_reset( ecg_gsr_t *ctx );

Examples Description

This click is made for PPG, ECG and GSR, equipped with an ultra-low power, multi channel, integrated biopotential AFE and EFE.

The demo application is composed of two sections :

Application Init

Initializes driver, performs SW reset of all the registers, which puts the registers in their initial state.

void application_init ( void )
{
    log_cfg_t log_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.
    ecg_gsr_cfg_setup( &ecg_gsr_cfg );
    ECG_GSR_MAP_MIKROBUS( ecg_gsr_cfg, MIKROBUS_1 );
    ecg_gsr_init( &ecg_gsr, &ecg_gsr_cfg );
    Delay_1sec();
    ecg_gsr_default_cfg( &ecg_gsr, &ecg_gsr_cfg );
    Delay_1sec();
}

Application Task

Depending on the user selection, application measures: value of oxygen level in human's blood or heartrate or galvanic skin response

ecg_gsr_err_t application_task( void )
{
    // ------------------------------------------------------------
    // Check the presence of the ECG GSR Click by reading device ID.
    // ------------------------------------------------------------
    ecg_gsr_read_dev_id(&ecg_gsr, ECG_GSR_ID_REG, &dev_id , 1);

    if ( dev_id != ECG_GSR_DEV_ID )
    {
        return ecg_gsr_init_error;
    }

    // ------------------------------------------------------------
    // Enable desired functionality of the ECG GSR Click.
    // ------------------------------------------------------------
    if ( ecg_gsr_cfg.click_functionality == DEFAULT_ECG_GSR_CLICK_FUNCTIONALITY )
    {
        ecg_gsr_get_oxygen_saturation();
    } else if ( ecg_gsr_cfg.click_functionality == ENABLE_HEARTRATE_FUNCTIONALITY )
    {
        ecg_gsr_get_heartrate();
    } else if ( ecg_gsr_cfg.click_functionality == ENABLE_GALVANIC_SKIN_RESPONSE_FUNCTIONALITY )
    {
        ecg_gsr_get_galvanic_skin_response();
    } else
    {
        return ecg_gsr_init_error;
    }

    return ecg_gsr_ok;
}

Note

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

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.ECG_GSR

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.