Barometer 2 Click

Barometer 2 Click is a digital barometer on a Click board™. Barometer 2 is equipped with the LPS35HW, an absolute piezoresistive pressure sensor with ceramic, water resistant package, manufactured using a proprietary technology.

Click Product page

Click library

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

Software Support

We provide a library for the Barometer2 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 Barometer2 Click driver.

Standard key functions :

• Config Object Initialization function.

  void barometer2_cfg_setup ( barometer2_cfg_t *cfg );

• Initialization function.

  BAROMETER2_RETVAL barometer2_init ( barometer2_t ctx, barometer2_cfg_t cfg );

• Click Default Configuration function.

  void barometer2_default_cfg ( barometer2_t *ctx );

Example key functions :

• Gets the pressure value.

  float barometer2_get_pressure ( barometer2_t *ctx, uint8_t press_format );

• Gets the temperature value.

  float barometer2_get_temperature ( barometer2_t *ctx, uint8_t temp_format );

• Resets the device.

  void barometer2_software_reset ( barometer2_t *ctx );

Examples Description

The example starts off with the initialization and configuration of the Click and logger modules, tests the communication channel and reads and displays temperature and pressure values every second.

The demo application is composed of two sections :

Application Init

Initializes and configures the Click and logger modules and tests the communication for errors.

void application_init ( )
{
    log_cfg_t log_cfg;
    barometer2_cfg_t cfg;

    uint8_t test;

    /** 
     * 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.

    barometer2_cfg_setup( &cfg );
    BAROMETER2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    barometer2_init( &barometer2, &cfg );
    barometer2_default_cfg( &barometer2 );

    // Test communication

    test = barometer2_read_byte( &barometer2, BAROMETER2_REG_WHO_AM_I ); 

    if ( test == BAROMETER2_WHO_AM_I )
    {
        log_printf( &logger, "---- Communication OK!!! ----\r\n" );
    }
    else
    {
        log_printf( &logger, "---- Communication ERROR!!! ----\r\n" );
        for ( ; ; );
    } 

    // Software reset 

    barometer2_software_reset( &barometer2 );
    Delay_1sec();

    Delay_1sec( );
    log_printf( &logger, "---- Start Measurement ---- \r\n" );
}

Application Task

Reads and displays temperature and pressure values every second.

void application_task ( )
{
    float temperature;
    float pressure;

    temperature = barometer2_get_temperature( &barometer2, BAROMETER2_TEMPERATURE_IN_CELSIUS );
    log_printf( &logger, " Temperature : %f ", temperature );

    pressure = barometer2_get_pressure( &barometer2, BAROMETER2_PRESSURE_DATA_IN_mBar );
    log_printf( &logger, " Pressure : %f \n", pressure );

    log_printf( &logger, "--------------------------\n" );
    Delay_ms ( 1000 );
}  

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.Barometer2

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.