DIGI POT 12 Click

DIGI POT 12 Click is a compact add-on board that contains a digitally controlled potentiometer. This board features the AD5142A, a dual-channel, 256-position nonvolatile digital potentiometer from Analog Devices. On this Click board™, two digitally I2C-controlled potentiometers are realized with end-to-end resistance of 10KΩ and wiper resistance of only 40Ω. The DIGI POT 12 Click can be used in potentiometer and linear gain modes.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Apr 2023.
• Type : I2C type

Software Support

We provide a library for the DIGI POT 12 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 DIGI POT 12 Click driver.

Standard key functions :

• digipot12_cfg_setup Config Object Initialization function.

  void digipot12_cfg_setup ( digipot12_cfg_t *cfg );

• digipot12_init Initialization function.

  err_t digipot12_init ( digipot12_t *ctx, digipot12_cfg_t *cfg );

• digipot12_default_cfg Click Default Configuration function.

  err_t digipot12_default_cfg ( digipot12_t *ctx );

Example key functions :

• digipot12_set_resistance DIGI POT 12 set the resistance function.

  err_t digipot12_set_resistance ( digipot12_t *ctx, uint8_t wiper_sel, float res_kohm );

• digipot12_get_resistance DIGI POT 12 get the resistance function.

  err_t digipot12_get_resistance ( digipot12_t *ctx, uint8_t wiper_sel, float *res_kohm );

Example Description

This library contains API for DIGI POT 12 Click driver. The demo application uses a digital potentiometer to change the resistance values of both channels.

The demo application is composed of two sections :

Application Init

The initialization of I2C module, log UART, and additional pins. After the driver init, the app executes a default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    digipot12_cfg_t digipot12_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.
    digipot12_cfg_setup( &digipot12_cfg );
    DIGIPOT12_MAP_MIKROBUS( digipot12_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == digipot12_init( &digipot12, &digipot12_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( DIGIPOT12_ERROR == digipot12_default_cfg ( &digipot12 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, " ----------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

This example demonstrates the use of the DIGI POT 12 Click board™. The demo application iterates through the entire wiper range and sets the resistance of both channels in steps of approximately 1kOhm. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
    static float res_kohm;
    for ( uint8_t n_cnt = DIGIPOT12_RES_0_KOHM; n_cnt <= DIGIPOT12_RES_10_KOHM; n_cnt++ )
    {
        if ( DIGIPOT12_OK == digipot12_set_resistance( &digipot12, DIGIPOT12_WIPER_SEL_1, ( float ) n_cnt ) )
        {
            if ( DIGIPOT12_OK == digipot12_get_resistance( &digipot12, DIGIPOT12_WIPER_SEL_1, &res_kohm ) )
            {
                log_printf( &logger, " Rwb1 : %.2f kOhm\r\n", res_kohm );
                Delay_ms ( 100 );
            }
        }

        if ( DIGIPOT12_OK == digipot12_set_resistance( &digipot12, DIGIPOT12_WIPER_SEL_2, ( float ) ( DIGIPOT12_RES_10_KOHM - n_cnt ) ) )
        {
            if ( DIGIPOT12_OK == digipot12_get_resistance( &digipot12, DIGIPOT12_WIPER_SEL_2, &res_kohm ) )
            {
                log_printf( &logger, " Rwb2 : %.2f kOhm\r\n", res_kohm );
                Delay_ms ( 100 );
            }
        }
        log_printf( &logger, " ----------------------------\r\n" );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        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.DIGIPOT12

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.