Altitude 5 Click

Altitude 5 Click is a compact add-on board allowing high-resolution barometric pressure measurement. This board features the KP236, an analog barometric air pressure sensor based on a capacitive principle from Infineon Technologies. The KP236 is primarily developed for measuring barometric air pressure but can also be used in other application fields. It is surface micro-machined with a monolithic integrated signal conditioning circuit implemented in BiCMOS technology. The calibrated transfer function converts pressure into an analog output signal in a range of 40kPa to 115kPa. However, the choice of signal processing is up to the user; more precisely, the user can process the output signal in analog or digital form. The high accuracy and the high sensitivity of the KP236 make this Click board™ suitable for advanced automotive applications and industrial and consumer applications.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Sep 2021.
• Type : I2C type

Software Support

We provide a library for the Altitude5 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 Altitude5 Click driver.

Standard key functions :

• altitude5_cfg_setup Config Object Initialization function.

  void altitude5_cfg_setup ( altitude5_cfg_t *cfg );

• altitude5_init Initialization function.

  err_t altitude5_init ( altitude5_t *ctx, altitude5_cfg_t *cfg );

• altitude5_default_cfg Click Default Configuration function.

  err_t altitude5_default_cfg ( altitude5_t *ctx );

Example key functions :

• altitude5_get_altitude Altitude 5 get altitude function.

  err_t altitude5_get_altitude ( altitude5_t *ctx, float *altitude );

• altitude5_get_pressure Altitude 5 get pressure function.

  err_t altitude5_get_pressure ( altitude5_t *ctx, float *pressure );

• altitude5_get_adc_voltage Altitude 5 get ADC voltage function.

  err_t altitude5_get_adc_voltage ( altitude5_t *ctx, float *adc_vtg );

Example Description

This library contains API for Altitude 5 Click driver. The demo application reads ADC value, calculate pressure and altitude.

The demo application is composed of two sections :

Application Init

Initializes I2C or analog driver and log UART. After driver initialization the app set default settings.

void application_init ( void ) 
{
    log_cfg_t log_cfg;              /**< Logger config object. */
    altitude5_cfg_t altitude5_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.
    altitude5_cfg_setup( &altitude5_cfg );
    ALTITUDE5_MAP_MIKROBUS( altitude5_cfg, MIKROBUS_1 );
    err_t init_flag = altitude5_init( &altitude5, &altitude5_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    altitude5_default_cfg ( &altitude5 );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

This is an example that demonstrates the use of the Altitude 5 Click board™. In this example, we read ADC values and display the Pressure ( mBar ) and Altitude ( m ) data. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( void ) 
{
    static float pressure;
    static float altitude;

    altitude5_get_pressure( &altitude5, &pressure );
    log_printf( &logger, " Pressure    : %.2f mBar \r\n", pressure );
    Delay_ms ( 100 );

    altitude5_get_altitude( &altitude5, &altitude );
    log_printf( &logger, " Altitude    : %.2f m \r\n", altitude );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms ( 1000 );
}

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.Altitude5

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.