pressure20

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Pressure 20 click

Pressure 20 Click is a compact add-on board that contains a board-mount pressure sensor. This board features the ICP-20100, a high-accuracy digital barometric pressure and temperature sensor from TDK InvenSense. The ICP-20100 is based on MEMS capacitive technology with ultra-low noise, low power consumption, and temperature stability alongside programmable output: all-pressure, all-temperature, or pressure and temperature output. It converts output data into a 20-bit digital value and sends the information via a configurable host interface that supports SPI and I2C serial communications. It measures pressure from 30kPa up to 110kPa with an accuracy of ±20Pa over a wide operating temperature range.

click Product page

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Click library

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

Software Support

We provide a library for the Pressure 20 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 Pressure 20 Click driver.

Standard key functions :

• pressure20_cfg_setup Config Object Initialization function.

void pressure20_cfg_setup ( pressure20_cfg_t *cfg );

• pressure20_init Initialization function.

err_t pressure20_init ( pressure20_t *ctx, pressure20_cfg_t *cfg );

• pressure20_default_cfg Click Default Configuration function.

err_t pressure20_default_cfg ( pressure20_t *ctx );

Example key functions :

• pressure20_get_int_pin This function returns the INT pin logic state.

uint8_t pressure20_get_int_pin ( pressure20_t *ctx );

• pressure20_clear_interrupts This function reads and clears the interrupt status register.

err_t pressure20_clear_interrupts ( pressure20_t *ctx );

• pressure20_read_data This function reads the pressure [mBar] and temperature [Celsius] data.

err_t pressure20_read_data ( pressure20_t *ctx, float *pressure, float *temperature );

Example Description

This example demonstrates the use of Pressure 20 click board by reading and displaying the pressure and temperature data 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. */
    pressure20_cfg_t pressure20_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.
    pressure20_cfg_setup( &pressure20_cfg );
    PRESSURE20_MAP_MIKROBUS( pressure20_cfg, MIKROBUS_1 );
    err_t init_flag  = pressure20_init( &pressure20, &pressure20_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( PRESSURE20_ERROR == pressure20_default_cfg ( &pressure20 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Waits for the data ready interrupt, clears the interrupts and than reads the pressure [mBar] and temperature [Celsius] data and displays them on the USB UART at the set output data rate (25Hz by default).

void application_task ( void )
{
    // Wait for the data ready interrupt
    while ( pressure20_get_int_pin ( &pressure20 ) );
    float pressure, temperature;
    if ( ( PRESSURE20_OK == pressure20_clear_interrupts ( &pressure20 ) ) &&
         ( PRESSURE20_OK == pressure20_read_data ( &pressure20, &pressure, &temperature ) ) )
    {
        log_printf ( &logger, " Pressure: %.1f mBar\r\n", pressure );
        log_printf ( &logger, " Temperature: %.2f C\r\n\n", temperature );
    }
}

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.Pressure20

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.

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