LDC 2 Click

LDC 2 Click is a compact add-on board that measures inductance change which a conductive target causes when it moves into the inductor's AC magnetic field. This board features the LDC1041, inductance-to-digital converter (LDC) for inductive sensing solutions from Texas Instruments.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Jul 2021.
• Type : SPI type

Software Support

We provide a library for the LDC2 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 LDC2 Click driver.

Standard key functions :

• ldc2_cfg_setup Config Object Initialization function.

  void ldc2_cfg_setup ( ldc2_cfg_t *cfg );

• ldc2_init Initialization function.

  err_t ldc2_init ( ldc2_t *ctx, ldc2_cfg_t *cfg );

• ldc2_default_cfg Click Default Configuration function.

  err_t ldc2_default_cfg ( ldc2_t *ctx );

Example key functions :

• ldc2_measure_resonance_impedance This function measures the resonance impedance and proximity data.

  err_t ldc2_measure_resonance_impedance ( ldc2_t *ctx, uint8_t *prox_data, float *rp_data );

• ldc2_measure_inductance This function measures the inductance and sensor frequency.

  err_t ldc2_measure_inductance ( ldc2_t *ctx, float *freq, float *inductance );

• ldc2_get_sensor_frequency This function reads and calculates the sensor frequency.

  err_t ldc2_get_sensor_frequency ( ldc2_t *ctx, float *freq );

Example Description

This example demonstrates the use of LDC 2 Click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and configures the Click board.

void application_init ( void )
{
    log_cfg_t log_cfg;      /**< Logger config object. */
    ldc2_cfg_t ldc2_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 );
    Delay_ms ( 100 );
    log_info( &logger, " Application Init " );

    // Click initialization.

    ldc2_cfg_setup( &ldc2_cfg );
    LDC2_MAP_MIKROBUS( ldc2_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == ldc2_init( &ldc2, &ldc2_cfg ) )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    if ( LDC2_ERROR == ldc2_default_cfg ( &ldc2 ) )
    {
        log_error( &logger, " Default Config Error. " );
        log_info( &logger, " Please, run program again... " );

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

Application Task

Measures the resonance impedance and proximity as well as the inductance and sensor frequency approximately every 200ms and displays all values on the USB UART.

void application_task ( void )
{
    uint8_t prox_data = 0;
    float rp_data = 0;
    float freq = 0;
    float inductance = 0;

    if ( LDC2_OK == ldc2_measure_resonance_impedance( &ldc2, &prox_data, &rp_data ) )
    {
        log_printf( &logger, " Proximity: %u\r\n Resonance Impedance: %.3f kOhm\r\n\n", ( uint16_t ) prox_data, rp_data );
    }

    if ( LDC2_OK == ldc2_measure_inductance( &ldc2, &freq, &inductance ) )
    {
        log_printf( &logger, " Sensor Frequency: %.3f MHz\r\n Inductance: %.6f uH\r\n\n", freq, inductance );
    }

    Delay_ms ( 200 );
}

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.LDC2

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.