CAP WHEEL Click

CAP Wheel Click is a capacitive touch sensor with round shaped electrodes integrated on a Click board™. This Click can sense touch even through plastic, wood, or other dielectric materials, which can be used to protect the surface of the PCB and the sensor pad trace itself.

Click Product page

Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : I2C type

Software Support

We provide a library for the CapWheel 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 CapWheel Click driver.

Standard key functions :

• Config Object Initialization function.

  void capwheel_cfg_setup ( capwheel_cfg_t *cfg );

• Initialization function.

  CAPWHEEL_RETVAL capwheel_init ( capwheel_t ctx, capwheel_cfg_t cfg );

Example key functions :

• Generic Write function.

  uint8_t capwheel_write_reg ( capwheel_t ctx, uint8_t register_address, uint8_t data_in, uint8_t n_bytes );

• Generic Read function.

  uint8_t capwheel_read_reg ( capwheel_t ctx, uint8_t register_address, uint8_t data_out, uint8_t n_bytes );

• Data Ready Check function.

  uint8_t capwheel_check_data_ready ( capwheel_t *ctx );

Examples Description

This application is use for controling various devices.

The demo application is composed of two sections :

Application Init

Initializes I2C interface, performs the device reset and activates the desired channels (from CH0 to CH9), in this example all channels are activated.

void application_init ( void )
{
    log_cfg_t log_cfg;
    capwheel_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.

    capwheel_cfg_setup( &cfg );
    CAPWHEEL_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    capwheel_init( &capwheel, &cfg );

    capwheel_reset ( &capwheel );
    capwheel_enable_chann( &capwheel, CAPWHEEL_CH0_PROX_EN | CAPWHEEL_CH1_EN | CAPWHEEL_CH2_EN | CAPWHEEL_CH3_EN | CAPWHEEL_CH4_EN | CAPWHEEL_CH5_EN | CAPWHEEL_CH6_EN | CAPWHEEL_CH7_EN | CAPWHEEL_CH8_EN | CAPWHEEL_CH9_EN );
    capwheel_set_threshold( &capwheel, 0x03 );
    Delay_ms ( 500 );

    log_printf( &logger, "CAP Wheel is initialized and ready\r\n" );
}

Application Task

Checks is sense data ready for reading and if was ready, then reads wheel coordinates and sends these results to the LEDs.

void application_task ( void )
{
    uint16_t sense_data;
    uint8_t ready_check;

    ready_check = capwheel_check_data_ready( &capwheel );

    if (ready_check == CAPWHEEL_DATA_READY)
    {
        capwheel_get_data( &capwheel, &sense_data );

        capwheel_set_output( &capwheel, sense_data, CAPWHEEL_LED_BRIGHTNESS_NUMBER );
    }
}  

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.CapWheel

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.