noise

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Noise Click

Noise Click is a mikroBUS add-on board with noise detecting circuitry. It enables you to set a noise detection threshold for alarm systems, environmental monitoring or data logging.

Click Product page

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Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : SPI type

Software Support

We provide a library for the noise 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 noise Click driver.

Standard key functions :

• noise_cfg_setup Config Object Initialization function.

void noise_cfg_setup ( noise_cfg_t *cfg ); 

• noise_init Initialization function.

err_t noise_init ( noise_t *ctx, noise_cfg_t *cfg );

• noise_default_cfg Click Default Configuration function.

void noise_default_cfg ( noise_t *ctx );

Example key functions :

• noise_set_cmd_reg This function sets command register.

err_t noise_set_cmd_reg ( noise_t *ctx, uint8_t configuration, uint16_t threshold );

• noise_set_state This function switches Click on or off.

void noise_set_state ( noise_t *ctx, uint8_t state );

• noise_read_an_pin_voltage This function reads results of AD conversion of the AN pin and converts them to proportional voltage level.

err_t noise_read_an_pin_voltage ( noise_t *ctx, float *data_out );

Examples Description

This example performs an ambient noise monitoring using the Noise Click board.

The demo application is composed of two sections :

Application Init

Device initialization.

void application_init ( void )
{
    log_cfg_t log_cfg;
    noise_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.
    noise_cfg_setup( &cfg );
    NOISE_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    noise_init( &noise, &cfg );

    noise_default_cfg( &noise );
}
  

Application Task

Reads the voltage from AN pin which presents the noise level and displays it on the USB UART every 5ms. If the noise is above predefined threshold (25 percents of max noise, i.e. about 0.4V) an alarm message is being shown.

void application_task ( void )
{
    float voltage = 0;
    if ( NOISE_OK == noise_read_an_pin_voltage ( &noise, &voltage ) )
    {
        log_printf( &logger, "%.3f\r\n", voltage );
    }
    if ( noise_check_int_pin( &noise ) )
    {
        log_printf( &logger, " Sound overlimit detected!\r\n" );
    }
    Delay_ms ( 5 );
}

Note

We recommend using the SerialPlot tool for data visualizing.

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.Noise

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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