ADC 18 Click

ADC 18 Click is a compact add-on board that contains a high-performance data converter. This board features the MAX22005, an SPI-configurable twelve-channel 24-bit analog-to-digital converter (ADC) from Analog Devices.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Mar 2022.
• Type : SPI type

Software Support

We provide a library for the ADC 18 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 ADC 18 Click driver.

Standard key functions :

• adc18_cfg_setup Config Object Initialization function.

  void adc18_cfg_setup ( adc18_cfg_t *cfg );

• adc18_init Initialization function.

  err_t adc18_init ( adc18_t *ctx, adc18_cfg_t *cfg );

• adc18_default_cfg Click Default Configuration function.

  err_t adc18_default_cfg ( adc18_t *ctx );

Example key functions :

• adc18_set_active_channel This function sets the active channel.

  err_t adc18_set_active_channel ( adc18_t *ctx, uint8_t channel );

• adc18_start_conversion This function starts the conversion with the selected data rate.

  err_t adc18_start_conversion ( adc18_t *ctx, uint8_t data_rate );

• adc18_read_voltage This function reads RAW ADC value of previous conversion and converts it to voltage.

  err_t adc18_read_voltage ( adc18_t *ctx, float *voltage );

Example Description

This example demonstrates the use of ADC 18 Click board by reading the voltage from 12 analog input single-ended channels.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger, and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    adc18_cfg_t adc18_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.
    adc18_cfg_setup( &adc18_cfg );
    ADC18_MAP_MIKROBUS( adc18_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == adc18_init( &adc18, &adc18_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( ADC18_ERROR == adc18_default_cfg ( &adc18 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

Reads and displays the voltage from 12 analog input single-ended channels on the USB UART approximately once per second.

void application_task ( void )
{
    static uint8_t channel = ADC18_CH_AI1_SINGLE_ENDED;
    if ( ADC18_OK == adc18_set_active_channel ( &adc18, channel ) )
    {
        adc18_start_conversion ( &adc18, ADC18_DATA_RATE_225_SPS );

        // Waits for the availability of the conversion result
        while ( adc18_get_rdy_pin ( &adc18 ) );

        adc18_stop_conversion ( &adc18 );

        float voltage;
        if ( ADC18_OK == adc18_read_voltage ( &adc18, &voltage ) )
        {
            log_printf ( &logger, "Channel AI%u: %.2f V\r\n", channel + 1, voltage );
            if ( ++channel > ADC18_CH_AI12_SINGLE_ENDED )
            {
                channel = ADC18_CH_AI1_SINGLE_ENDED;
                log_printf ( &logger, "\r\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.ADC18

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.