DAQ Click

DAQ Click is a compact add-on board representing a data acquisition solution. This board features the ADAQ7768-1, a 24-bit precision data acquisition (DAQ) μModule system that encapsulates signal conditioning, conversion, and processing blocks into one SiP from Analog Devices. It supports a fully differential input signal with a maximum voltage range of ±12V with an excellent common-mode rejection ratio (CMRR). The input signal is fully buffered with a low input bias current, enabling the ADAQ7768-1 to interface to sensors with high output impedance directly.

Click Product page

Click library

• Author : Luka Filipovic
• Date : Jun 2021.
• Type : SPI type

Software Support

We provide a library for the DAQ 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 DAQ Click driver.

Standard key functions :

• daq_cfg_setup Config Object Initialization function.

  void daq_cfg_setup ( daq_cfg_t *cfg );

• daq_init Initialization function.

  err_t daq_init ( daq_t *ctx, daq_cfg_t *cfg );

• daq_default_cfg Click Default Configuration function.

  err_t daq_default_cfg ( daq_t *ctx );

Example key functions :

• daq_set_gain Set gain range.

  err_t daq_set_gain ( daq_t *ctx, daq_gain gain );

• daq_read_data Reading adc data.

  err_t daq_read_data ( daq_t *ctx, int32_t *adc_data );

• daq_calculate_voltage Convert data from raw ADC to voltage.

  void daq_calculate_voltage ( daq_t *ctx, int32_t adc_data, float *voltage );

Example Description

This example showcases ability of the device to read ADC data and calculate voltage for set configuration.

The demo application is composed of two sections :

Application Init

Initialization of communication modules (SPI, UART) and additional pins for controling device. Resets device and then configures default configuration and sets read range by setting gain to +-12V. In the end reads vendor and device ID to confirm communication.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    daq_cfg_t daq_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.
    daq_cfg_setup( &daq_cfg );
    DAQ_MAP_MIKROBUS( daq_cfg, MIKROBUS_1 );
    err_t init_flag  = daq_init( &daq, &daq_cfg );
    if ( SPI_MASTER_ERROR == init_flag ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    if ( daq_default_cfg ( &daq ) ) 
    {
        log_error( &logger, " Default configuration. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    uint8_t id = 0;
    daq_generic_read( &daq, DAQ_REG_VENDOR_H, &id, 1 );
    log_printf( &logger, " > Vendor: \t0x%.2X", ( uint16_t )id );
    daq_generic_read( &daq, DAQ_REG_VENDOR_L, &id, 1 );
    log_printf( &logger, "%.2X\r\n", ( uint16_t )id );
    daq_generic_read( &daq, DAQ_REG_PRODUCT_ID_H, &id, 1 );
    log_printf( &logger, " > ID: \t\t0x%.2X", ( uint16_t )id );
    daq_generic_read( &daq, DAQ_REG_PRODUCT_ID_L, &id, 1 );
    log_printf( &logger, "%.2X\r\n", ( uint16_t )id );
    Delay_ms ( 1000 );

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

Application Task

Reads ADC data and calculates voltage from it, every 0.3 seconds.

void application_task ( void ) 
{
    int32_t adc_data = 0;
    float voltage = 0.0;
    daq_read_data( &daq, &adc_data );
    daq_calculate_voltage( &daq, adc_data, &voltage );

    log_printf( &logger, " > Data: %ld\r\n", adc_data );
    log_printf( &logger, " > Voltage: %.2f\r\n", voltage );
    log_printf( &logger, "***********************************\r\n" );
    Delay_ms ( 300 );  
}

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.DAQ

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.