IR Grid Click

IR Grid Click is a thermal imaging sensor. It has an array of 64 very sensitive factory calibrated IR elements (pixels), arranged in 4 rows of 16 pixels, each measuring an object temperature up to 300˚C within its local Field of View (FOV). The MLX90621ESF-BAD IR sensor used on this Click board™ has only four pins, and it is mounted inside of the industry standard TO39 package. It is equipped with 2Kbit of EEPROM for storing the compensation and calibration parameters.

Click Product page

Click library

• Author : MikroE Team
• Date : maj 2020.
• Type : I2C type

Software Support

We provide a library for the IrGrid 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 IrGrid Click driver.

Standard key functions :

• Config Object Initialization function.

  void irgrid_cfg_setup ( irgrid_cfg_t *cfg );

• Initialization function.

  IRGRID_RETVAL irgrid_init ( irgrid_t ctx, irgrid_cfg_t cfg );

Example key functions :

• Measures temperature and places it inside internal buffers. This function is

• needed to be called prior to irgrid_get_ir_raw or irgrid_get_temperature.

  uint8_t irgrid_measure ( irgrid_t ctx, irgrid_data_t data_str );

• Populates provided buffer with calculated temperatures. Buffer must have at least 64 members.

  void irgrid_get_temperature ( irgrid_data_t data_str, float buffer );

• Read function using EEPROM slave adress.

  void irgrid_read_eeprom ( irgrid_t ctx, uint8_t reg, uint8_t data_buf, uint8_t len );

Examples Description

IR Grid Click is a thermal imaging sensor. It has an array of 64 very sensitive factory calibrated IR elements (pixels), arranged in 4 rows of 16 pixels, each measuring an object temperature up to 300˚C.

The demo application is composed of two sections :

Application Init

Initializes driver init and IR Grid module

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    irgrid_cfg_t irgrid_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.
    irgrid_cfg_setup( &irgrid_cfg );
    IRGRID_MAP_MIKROBUS( irgrid_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == irgrid_init( &irgrid, &irgrid_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    irgrid_device_init( &irgrid, &irgrid_data, 16 );

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

Application Task

Reads the temperature of all pixels and creates a pixel temperature matrix that logs on usbuart every half of second

void application_task ( void )
{    
    if ( 1 != irgrid_measure( &irgrid, &irgrid_data ) )
    {
        irgrid_get_temperature( &irgrid_data, &ir_tmp[ 0 ] );
    }

    for ( rc = 0; rc < 4; rc++ )
    {
        for ( cc = 0; cc < 16; cc++ )
        {
            i = ( cc * 4 ) + rc;
            log_printf( &logger, "%.3f    ", ir_tmp[ i ] );
        }
        log_printf( &logger, "\r\n" );
        Delay_ms ( 100 );
    }

    log_printf( &logger, "\r\n" );
    log_printf( &logger, "\r\n" );
    log_printf( &logger, "\r\n" );
    Delay_ms ( 500 );
}  

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.IrGrid

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.