RTD 2 click

RTD 2 Click is a compact add-on board used for applications with resistive elements that change resistance over temperature. This board features the ADS1247, 24-bit analog-to-digital converter with a programmable gain amplifier (PGA) for sensor measurement applications from Texas Instruments.

click Product page

Click library

• Author : MikroE Team
• Date : Sep 2020.
• Type : SPI type

Software Support

We provide a library for the Rtd 2 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Rtd 2 Click driver.

Standard key functions :

• rtd2_cfg_setup Config Object Initialization function.

  void rtd2_cfg_setup ( rtd2_cfg_t *cfg ); 

• rtd2_init Initialization function.

  err_t rtd2_init ( rtd2_t *ctx, rtd2_cfg_t *cfg );

• rtd2_default_cfg Click Default Configuration function.

  void rtd2_default_cfg ( rtd2_t *ctx );

Example key functions :

• rtd2_check_new_data_ready The function check new data ready of the 4ADS1247 24-Bit, 2-kSPS, Analog-To-Digital Converters With Programmable Gain Amplifier (PGA) For Sensor Measurement on the RTD 2 click board.

  uint8_t rtd2_check_new_data_ready ( rtd2_t *ctx );

• rtd2_get_temperature The function read output data and return ambient temperature from the PT100 3-wire temperature probe wired to the 4ADS1247 24-Bit, 2-kSPS, Analog-To-Digital Converters With Programmable Gain Amplifier (PGA) For Sensor Measurement on the RTD 2 click board.

  float rtd2_get_temperature ( rtd2_t *ctx );

• rtd2_enable_start The function enables ADC conversion of the 4ADS1247 24-Bit, 2-kSPS, Analog-To-Digital Converters With Programmable Gain Amplifier (PGA) For Sensor Measurement on the RTD 2 click.

  void rtd2_enable_start ( rtd2_t *ctx, uint8_t en_start );

Examples Description

RTD 2 Click board is commonly used for measuring ambient temperature from the PT100 3-wire temperature probe.

The demo application is composed of two sections :

Application Init

Initializes the driver, performs a hardware reset, and sets the click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;
    rtd2_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.
    rtd2_cfg_setup( &cfg );
    RTD2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    rtd2_init( &rtd2, &cfg );
    Delay_ms ( 200 );

    log_printf( &logger, "----- Hardware Reset ------\r\n" );
    rtd2_hw_reset( &rtd2 );
    Delay_ms ( 100 );

    log_printf( &logger, "-- Default configuration --\r\n" );
    rtd2_default_cfg( &rtd2 );
    Delay_ms ( 1000 );

    log_printf( &logger, "--------------------------\r\n" );
    log_printf( &logger, "     Start Measurement    \r\n" );
    log_printf( &logger, "--------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

Reads an ambient temperature measured by the PT100 3-wire temperature probe connected to the RTD 2 click board, and logs the results on the USB UART each second.

void application_task ( void )
{
    if ( rtd2_check_new_data_ready( &rtd2 ) == RTD2_NEW_DATA_IS_READY )
    {
        temperature = rtd2_get_temperature( &rtd2 );
        log_printf( &logger, " Temperature : %.2f C\r\n", temperature );
        log_printf( &logger, "--------------------------\r\n");
        Delay_ms ( 1000 );
    }
    else
    {
        rtd2_enable_start( &rtd2, RTD2_START_CONVERSION_DISABLE );
        Delay_ms ( 1000 );
    }
} 

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Rtd2

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.