opto8

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Opto 8 Click

Opto 8 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : Stefan Filipovic
• Date : Mar 2026.
• Type : GPIO type

Software Support

Example Description

This example demonstrates the use of the Opto 8 Click board by monitoring the state of opto-isolated inputs and controlling the corresponding outputs. When an input state changes, the application updates the related output and logs the new state to the serial terminal.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.Opto8

Example Key Functions

• opto8_cfg_setup This function initializes Click configuration structure to initial values.

  void opto8_cfg_setup ( opto8_cfg_t *cfg );

• opto8_init This function initializes all necessary pins and peripherals used for this Click board.

  err_t opto8_init ( opto8_t *ctx, opto8_cfg_t *cfg );

• opto8_default_cfg This function executes a default configuration of Opto 8 Click board.

  err_t opto8_default_cfg ( opto8_t *ctx );

• opto8_set_out1 This function sets the output 1 control pin to high logic state.

  void opto8_set_out1 ( opto8_t *ctx );

• opto8_clear_out1 This function clears the output 1 control pin to low logic state.

  void opto8_clear_out1 ( opto8_t *ctx );

• opto8_get_in1 This function reads the input 1 status pin logic state.

  uint8_t opto8_get_in1 ( opto8_t *ctx );

Application Init

Initializes the logger and Opto 8 Click driver and configures the digital input and output pins through the mikroBUS socket.

void application_init ( void )
{
    log_cfg_t log_cfg;  
    opto8_cfg_t opto8_cfg;  

    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
 
    // Click initialization.
    opto8_cfg_setup( &opto8_cfg );
    OPTO8_MAP_MIKROBUS( opto8_cfg, MIKROBUS_POSITION_OPTO8 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == opto8_init( &opto8, &opto8_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Continuously reads the states of the opto-isolated inputs and updates the corresponding outputs when a change is detected, logging the output state to the serial terminal.

void application_task ( void )
{
    static uint8_t out1_state = 255;
    static uint8_t out2_state = 255;
    uint8_t in1_state = 0;
    uint8_t in2_state = 0;
 
    in1_state = opto8_get_in1( &opto8 );
    in2_state = opto8_get_in2( &opto8 );
    
    if ( ( in1_state != out1_state ) || ( in2_state != out2_state ) )
    {
        out1_state = in1_state;
        if ( out1_state )
        {
            opto8_clear_out1( &opto8 );
            log_printf( &logger, " OUT1 state: Disabled\r\n" );
        }
        else
        {
            opto8_set_out1( &opto8 );
            log_printf( &logger, " OUT1 state: Enabled\r\n" );
        }
 
        out2_state = in2_state;
        if ( out2_state )
        {
            opto8_clear_out2( &opto8 );
            log_printf( &logger, " OUT2 state: Disabled\r\n\n" );
        }
        else
        {
            opto8_set_out2( &opto8 );
            log_printf( &logger, " OUT2 state: Enabled\r\n\n" );
        }
    }
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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