Radar Click

Radar Click is a compact add-on board that alerts you to the presence of an intruder via interpreting the infrared radiation that emanates from their body. This board features the MM5D91-00, a presence detection sensor module that integrates 60GHz mmWave technology that counts the number of people entering or exiting an entrance from Jorjin Technologies Inc. It includes the ARM Cortex-M4F based processor system, 1Tx, 3Rx antenna, and integrated regulator, alongside azimuth and elevation field of view of ±45° and ±40°. Its detection goes up to 10m for macro and 5m for micro motion with environmental-factors immunity such as temperature, wind, sunlight, and dust. This Click board™ is suitable for various presence sensing applications, from office and home to commercial buildings and more.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Mar 2022.
• Type : UART type

Software Support

We provide a library for the Radar 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 Radar Click driver.

Standard key functions :

• radar_cfg_setup Config Object Initialization function.

  void radar_cfg_setup ( radar_cfg_t *cfg );

• radar_init Initialization function.

  err_t radar_init ( radar_t *ctx, radar_cfg_t *cfg );

• radar_default_cfg Click Default Configuration function.

  err_t radar_default_cfg ( radar_t *ctx );

Example key functions :

• radar_get_event This function waits for an IN/OUT event or ACK command response.

  err_t radar_get_event ( radar_t *ctx, uint8_t *evt_id, uint8_t *payload, uint8_t *payload_size );

• radar_get_temperature This function reads the chip internal temperature.

  err_t radar_get_temperature ( radar_t *ctx, float *temperature );

• radar_set_detection_range This function sets the min and max presence detection values.

  err_t radar_set_detection_range ( radar_t *ctx, float min, float max );

Example Description

This example demonstrates the use of Radar Click board by reading and parsing events as well as the module internal temperature.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    radar_cfg_t radar_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.
    radar_cfg_setup( &radar_cfg );
    RADAR_MAP_MIKROBUS( radar_cfg, MIKROBUS_1 );
    if ( UART_ERROR == radar_init( &radar, &radar_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( RADAR_ERROR == radar_default_cfg ( &radar ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

Waits for the detection event and then displays on the USB UART the distance of detected object, accuracy, elapsed time since last reset, and the module internal temperature.

void application_task ( void )
{
    uint8_t evt_id, evt_payload_size, evt_payload[ 16 ];
    if ( RADAR_OK == radar_get_event ( &radar, &evt_id, evt_payload, &evt_payload_size ) )
    {
        if ( RADAR_CMD_ID_DETECT_IN_EVT == evt_id )
        {
            log_printf( &logger, " EVENT: IN\r\n" );
            radar_float_bytes_t distance;
            memcpy ( distance.b_data, &evt_payload[ 8 ], 4 );
            radar_float_ieee_to_mchip ( &distance.f_data );
            log_printf( &logger, " Target distance: %.3f m\r\n", distance.f_data );
            memcpy ( distance.b_data, &evt_payload[ 12 ], 4 );
            radar_float_ieee_to_mchip ( &distance.f_data );
            log_printf( &logger, " Accuracy (+/-): %.3f m\r\n", distance.f_data );
        }
        else
        {
            log_printf( &logger, " EVENT: OUT\r\n" );
        }
        uint32_t evt_time = ( ( uint32_t ) evt_payload[ 3 ] << 24 ) | ( ( uint32_t ) evt_payload[ 2 ] << 16 ) | 
                            ( ( uint16_t ) evt_payload[ 1 ] << 8 ) | evt_payload[ 0 ];
        log_printf( &logger, " Elapsed time: %.2f s\r\n", evt_time / 1000.0 );
        float temperature;
        if ( RADAR_OK == radar_get_temperature ( &radar, &temperature ) )
        {
            log_printf( &logger, " Temperature: %.2f C\r\n\n", temperature );
        }
    }
}

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.Radar

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. UART terminal is available in all MikroElektronika compilers.