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Button 2 Click

Button 2 Click is a compact add-on board designed for simple and efficient tactile input detection. This board features the TL3215AF160BQ, a TL3215 series of tactile switches from E-Switch, featuring high reliability and precise operation. The switch has a 2mm actuator, 160gf actuation force, silver contact material, and a lifespan of 1,000,000 cycles, while the integrated blue LED provides visual feedback. The board supports the new Click Snap feature, allowing easy detachment of the sensor area for flexible use.

Click Product page

Click library

  • Author : Stefan Filipovic
  • Date : Jun 2024.
  • Type : GPIO type

Software Support

We provide a library for the Button 2 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 Button 2 Click driver.

Standard key functions :

  • button2_cfg_setup Config Object Initialization function.
void button2_cfg_setup ( button2_cfg_t *cfg );
  • button2_init Initialization function.
err_t button2_init ( button2_t *ctx, button2_cfg_t *cfg );

Example key functions :

  • button2_get_int_pin This function returns the INT pin logic state.
uint8_t button2_get_int_pin ( button2_t *ctx );
  • button2_toggle_led This function toggles the button LED state by toggling the LED pin logic state.
void button2_toggle_led ( button2_t *ctx );
  • button2_enable_led This function enables button LED by setting the LED pin to the high logic state.
void button2_enable_led ( button2_t *ctx );

Example Description

This example demonstrates the use of Button 2 Click board by toggling the button LED and switch state on button press.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    button2_cfg_t button2_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.
    button2_cfg_setup( &button2_cfg );
    BUTTON2_MAP_MIKROBUS( button2_cfg, MIKROBUS_1 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == button2_init( &button2, &button2_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
    log_printf ( &logger, " Press button to change switch state\r\n\n" );
    log_printf ( &logger, " SWITCH OFF\r\n\n" );
}

Application Task

Toggles the button LED and switch state on button press and displays the state on the USB UART.

void application_task ( void )
{
    static uint8_t switch_state = BUTTON2_SWITCH_OFF;
    
    if ( BUTTON2_BUTTON_PRESSED == button2_get_int_pin ( &button2 ) )
    {
        button2_toggle_led ( &button2 );
        switch_state ^= BUTTON2_SWITCH_ON;
        if ( BUTTON2_SWITCH_ON == switch_state )
        {
            log_printf ( &logger, " SWITCH ON\r\n\n" );
        }
        else
        {
            log_printf ( &logger, " SWITCH OFF\r\n\n" );
        }
        Delay_ms ( 1000 );
    }
}

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.Button2

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.