altitude2

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Altitude 2 click

Altitude 2 click is a high-resolution barometric pressure sensor Click board™. It provides very accurate measurements of temperature and atmospheric pressure, which can be used to calculate the altitude with a very high resolution of 20cm per step. Besides that, the device also includes features such as the ultra-low noise delta-sigma 24bit ADC, low power consumption, fast conversion times, pre-programmed unique compensation values, and more.

click Product page

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Click library

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

Software Support

We provide a library for the Altitude2 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 Altitude2 Click driver.

Standard key functions :

• Config Object Initialization function.

void altitude2_cfg_setup ( altitude2_cfg_t *cfg );

• Initialization function.

ALTITUDE2_RETVAL altitude2_init ( altitude2_t *ctx, altitude2_cfg_t *cfg );

• Click Default Configuration function.

void altitude2_default_cfg ( altitude2_t *ctx );

Example key functions :

• This function resets the device and reads calibration coefficients after reset.

void altitude2_reset( altitude2_t *ctx );

• This function reads calibration data from PROM.

uint8_t altitude2_read_prom ( altitude2_t *ctx, uint8_t select_data, uint32_t *data_out );

• This function determines oversampling ratio for temperature and pressure measurement.

uint8_t altitude2_set_ratio( altitude2_t *ctx, uint8_t temp_ratio, uint8_t press_ratio );

Examples Description

This example demonstrates the use of Altitude 2 Click to measure temperature, altitude and pressure.

The demo application is composed of two sections :

Application Init

Initializes I2C driver and performs the device reset, after which the calibration coefficients be read. Determines the ratio value for temperature and pressure measurements. Calibration coefficients are necessary to read after the device reset.

void application_init ( void )
{
    log_cfg_t log_cfg;
    altitude2_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.

    altitude2_cfg_setup( &cfg );
    ALTITUDE2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    altitude2_init( &altitude2, &cfg );
    Delay_ms( 500 );
    altitude2_reset( &altitude2 );
    
    altitude2_set_ratio ( &altitude2, ALTITUDE2_RATIO_2048, ALTITUDE2_RATIO_2048 );
    log_printf( &logger, "Altitude 2 is initialized\r\n" );
    Delay_ms( 200 );
}
  

Application Task

Gets temperature data in celsius value and pressure data in mbar value. Gets the calculated altitude value in meters which depends on the temperature and pressure measurements. Logs results on USBUART and repeats operation each second.

void application_task ( void )
{
    altitude2_read_data( &altitude2, &temperature, &pressure, &altitude );

    log_printf( &logger, "Temperature: %.2f Celsius\r\n", temperature );
    log_printf( &logger, "Pressure: %.2f mbar\r\n", pressure );
    log_printf( &logger, "Altitude: %.2f m\r\n", altitude );
    log_printf( &logger, "---------------------------------------\r\n\r\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.Altitude2

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.

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