loadcell

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LOAD CELL Click

Load cell 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 : MikroE Team
• Date : Jan 2020.
• Type : GPIO type

Software Support

Example Description

Load cell Click is a weight measurement Click which utilizes a load cell element, in order to precisely measure the weight of an object. The Load Cell Click can be used with the strain gauge type of load cells and can measure up to ±20V or ±40V of differential voltage.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.LoadCell

Example Key Functions

• loadcell_cfg_setup Config Object Initialization function.

void loadcell_cfg_setup ( loadcell_cfg_t *cfg );

• loadcell_init Initialization function.

err_t loadcell_init ( loadcell_t *ctx, loadcell_cfg_t *cfg );

• loadcell_default_cfg Click Default Configuration function.

void loadcell_default_cfg ( loadcell_t *ctx );

• loadcell_read_results Read results of function.

uint8_t loadcell_read_results ( loadcell_t *ctx, uint8_t input_sel, uint32_t *data_out );

• loadcell_set_rate Set rate function.

void loadcell_set_rate ( loadcell_t *ctx, uint8_t rate_sel );

• loadcell_check_out Check status of pin DO (do_pin).

uint8_t loadcell_check_out ( loadcell_t *ctx );

• loadcell_reset Reset clock function.

void loadcell_reset ( loadcell_t *ctx );

• loadcell_set_mode Set clock mode function.

void loadcell_set_mode ( loadcell_t *ctx, uint8_t pwr_mode );

• loadcell_tare Function of messure and read results.

void loadcell_tare ( loadcell_t *ctx, uint8_t input_sel, loadcell_data_t *cell_data );

• loadcell_calibration Calibration function.

uint8_t loadcell_calibration ( loadcell_t *ctx, uint8_t input_sel, uint16_t cal_val, loadcell_data_t *cell_data );

• loadcell_get_weight Get weight function.

float loadcell_get_weight ( loadcell_t *ctx, uint8_t input_sel, loadcell_data_t *cell_data );

Application Init

Initializes GPIO driver and performs the device reset, after which the next conversion cycle will be for channel B with 32 gate value. This function also selects the frequency of internal oscillator to 10Hz. Sets tare the scale, calibrate scale and start measurements.

void application_init ( void )
{
    log_cfg_t log_cfg;
    loadcell_cfg_t cfg;

    /** 
     * 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.

    loadcell_cfg_setup( &cfg );
    LOADCELL_MAP_MIKROBUS( cfg, MIKROBUS_POSITION_LOADCELL );
    loadcell_init( &loadcell, &cfg );
    
    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, "     Load cell Click     \r\n");
    log_printf(&logger, "-------------------------\r\n");
    Delay_ms ( 100 );
    
    loadcell_set_mode( &loadcell, LOADCELL_POWER_UP );
    Delay_ms ( 100 );

    loadcell_reset( &loadcell );
    Delay_ms ( 100 );

    loadcell_set_rate( &loadcell, LOADCELL_10HZ_INTERNAL_OSC );
    Delay_ms ( 100 );

    log_printf(&logger, "    Tare the scale :   Channel B,  Gate 32  \r\n");
    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, " In the following 10 seconds please REMOVE all object from the scale.\r\n");
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );

    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, "    Start tare scales    \r\n");
    loadcell_tare ( &loadcell, LOADCELL_CHANN_B_GATE_32_NEXT, &cell_data );
    Delay_ms ( 500 );

    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, "    Tarring completed \r\n");

    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, " In the following 10 seconds place 100g weight etalon on the scale for calibration purpose.\r\n");
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );

    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, "    Start calibration    \r\n");

    if ( loadcell_calibration ( &loadcell, LOADCELL_CHANN_B_GATE_32_NEXT, LOADCELL_WEIGHT_100G, &cell_data ) == LOADCELL_GET_RESULT_OK )
    {
        log_printf(&logger, "-------------------------\r\n");
        log_printf(&logger, "    Calibration  Done    \r\n");

        log_printf(&logger, "- - - - - - - - - - - - -\r\n");
        log_printf(&logger, " In the following 10 seconds please REMOVE all object from the scale.\r\n");
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
    else
    {
        log_printf(&logger, "-------------------------\r\n");
        log_printf(&logger, "   Calibration  Error   \r\n");
        for ( ; ; );
    }

    log_printf(&logger, "-------------------------\r\n");
    log_printf(&logger, "   Start measurements :  \r\n");
    log_printf(&logger, "-------------------------\r\n");
}

Application Task

This is an example which demonstrates the use of Load Cell Click board. Display the measurement of scales in grams [ g ]. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on USB uart changes for every 1 sec.

void application_task ( void )
{
    weight_val = loadcell_get_weight( &loadcell, LOADCELL_CHANN_B_GATE_32_NEXT, &cell_data );

    log_printf(&logger, "     Weight : %.2f\r\n", weight_val );

    Delay_ms ( 1000 );
}

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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