Accel 22 Click

Accel 22 Click is a compact add-on board that contains an acceleration sensor. This board features the ADXL367, an ultra-low-power, high-performance three-axis accelerometer from Analog Devices. The ADXL367 allows selectable full-scale acceleration measurements in ranges of ±2g, ±4g, and ±8g in three axes, with a resolution of 0.25 mg/LSB on the ±2g range, alongside a configurable host interface that supports both SPI and I2C serial communication. This device combines a 3-axis MEMS accelerometer, a temperature sensor, and a 14-bit analog-to-digital converter (ADC) to synchronize an external analog signal conversion.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Apr 2022.
• Type : I2C/SPI type

Software Support

We provide a library for the Accel 22 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 Accel 22 Click driver.

Standard key functions :

• accel22_cfg_setup Config Object Initialization function.

  void accel22_cfg_setup ( accel22_cfg_t *cfg );

• accel22_init Initialization function.

  err_t accel22_init ( accel22_t *ctx, accel22_cfg_t *cfg );

• accel22_default_cfg Click Default Configuration function.

  err_t accel22_default_cfg ( accel22_t *ctx );

Example key functions :

• accel22_get_axes This function reads accel X, Y, and Z axis data in mg.

  err_t accel22_get_axes ( accel22_t *ctx, accel22_axes_t *axes );

• accel22_get_temperature This function reads the temperature in Celsius.

  err_t accel22_get_temperature ( accel22_t *ctx, float *temperature );

• accel22_get_adc This function reads the ADC voltage.

  err_t accel22_get_adc ( accel22_t *ctx, float *v_adc );

Example Description

This example demonstrates the use of Accel 22 Click board by reading and displaying Accel data (X, Y, and Z axis) as well as temperature and ADC measurements on the USB UART.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    accel22_cfg_t accel22_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.
    accel22_cfg_setup( &accel22_cfg );
    ACCEL22_MAP_MIKROBUS( accel22_cfg, MIKROBUS_1 );
    err_t init_flag  = accel22_init( &accel22, &accel22_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( ACCEL22_ERROR == accel22_default_cfg ( &accel22 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

Reads and displays the Accel data (X, Y, and Z axis) as well as temperature and ADC measurements on the USB UART every 100ms approximately.

void application_task ( void )
{
    accel22_axes_t axes;
    // Wait for data ready indication
    while ( !accel22_get_int1_pin ( &accel22 ) );
    if ( ACCEL22_OK == accel22_get_axes ( &accel22, &axes ) )
    {
        log_printf( &logger, " X: %.2f mg\r\n", axes.x );
        log_printf( &logger, " Y: %.2f mg\r\n", axes.y );
        log_printf( &logger, " Z: %.2f mg\r\n", axes.z );
    }

    if ( ACCEL22_OK == accel22_enable_temperature_measurement ( &accel22 ) )
    {
        float temperature = 0;
        // Wait for data ready indication
        while ( !accel22_get_int1_pin ( &accel22 ) );
        if ( ACCEL22_OK == accel22_get_temperature ( &accel22, &temperature ) )
        {
            log_printf( &logger, " Temperature: %.2f C\r\n", temperature );
        }
    }

    if ( ACCEL22_OK == accel22_enable_adc_measurement ( &accel22 ) )
    {
        float adc_voltage = 0;
        // Wait for data ready indication
        while ( !accel22_get_int1_pin ( &accel22 ) );
        if ( ACCEL22_OK == accel22_get_adc ( &accel22, &adc_voltage ) )
        {
            log_printf( &logger, " ADC: %.2f V\r\n\n", adc_voltage );
        }
    }
    Delay_ms ( 100 );
}

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.Accel22

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.