CapSense click

CapSense click add-on board features a capacitive sensing module CY8C201A0 which takes human body capacitance as an input and directly provides the real time sensor information via I2C output.

click Product page

Click library

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

Software Support

We provide a library for the CapSense 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 CapSense Click driver.

Standard key functions :

• capsense_cfg_setup Config Object Initialization function.

  void capsense_cfg_setup ( capsense_cfg_t *cfg ); 

• capsense_init Initialization function.

  err_t capsense_init ( capsense_t *ctx, capsense_cfg_t *cfg );

• capsense_default_cfg Click Default Configuration function.

  err_t capsense_default_cfg ( capsense_t *ctx );

Example key functions :

• capsense_get_slider_lvl This function gets slider level.

  err_t capsense_get_slider_lvl( capsense_t *ctx, uint8_t *slider_lvl );

• capsense_read_data Read one byte from register address

  err_t capsense_read_data( capsense_t *ctx, uint8_t reg_address, uint8_t *read_data );

• capsense_write_data Generic write data function

  err_t capsense_write_data( capsense_t *ctx, uint8_t reg_address, uint8_t write_command );

Examples Description

This example waits user to press top and bottom button to turn click's LEDs ON or OFF.

The demo application is composed of two sections :

Application Init

Initialize CapSense click and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;
    capsense_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.
    capsense_cfg_setup( &cfg );
    CAPSENSE_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    capsense_init( &capsense, &cfg );

    if ( CAPSENSE_ERROR == capsense_default_cfg ( &capsense ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Press top and bottom button and turn it ON or OFF button LED's.

void application_task ( void )
{
    static uint8_t current_led_state = 0;
    uint8_t output_lvl[ 10 ] = { 0 };
    uint8_t button_select = 0;
    uint8_t slider_lvl = 0;
    capsense_read_data( &capsense, CAPSENSE_CS_READ_STATUS0, &button_select );
    capsense_get_slider_lvl( &capsense, &slider_lvl );
    capsense_write_data( &capsense, CAPSENSE_OUTPUT_PORT0, current_led_state );
    Delay_ms ( 100 );

    if ( 8 == button_select )
    {
        current_led_state ^= 0x01;
        log_printf( &logger, "Toggle LED1\r\n");
        Delay_ms ( 100 );
    }
    if ( 16 == button_select )
    {
        current_led_state ^= 0x02;
        log_printf( &logger, "Toggle LED2\r\n");
        Delay_ms ( 100 );
    }
    if ( 24 == button_select )
    {
        current_led_state = ~current_led_state;
        log_printf( &logger, "Toggle both LEDs\r\n");
        Delay_ms ( 100 );
    }

    if ( slider_lvl )
    {
        bits_to_str( slider_lvl, output_lvl );
        log_printf( &logger, "Slider level - channels [5-1]:\t%s \r\n", &output_lvl[ 3 ] );
        Delay_ms ( 100 );
    }
}

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.CapSense

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.