30 min

Detect everything around you with MM5D91-00 and PIC18F2515

What’s on your radar?

Radar Click with EasyPIC v8

Published Nov 01, 2023

Click board™

Radar Click

Development board

EasyPIC v8


NECTO Studio



mmWave motion sensor that detects human presence, stationary or moving, within 10 meters area



Hardware Overview

How does it work?

Radar Click is based on the MM5D91-00, a presence detection sensor module with integrated mmWave technology from Jorjin Technologies Inc. It counts the number of people entering or exiting an entrance, simplifies the implementation of mmWave sensors in the band of 61.0 to 61.5GHz, and includes the ARM Cortex-M4F-based processor system 1Tx 3Rx antenna and onboard regulator. This Click board™ is built to demonstrate the function of the entrance counter of the 60GHz radar sensor with its sophisticated radar presence detection algorithms. Characterized by low power consumption and high resolution, this board represents a suitable solution for various presence-sensing applications, from office and home to commercial buildings. Its detection range goes up

to 10m for macro motion, representing human movements, and 5m for micromotion, which stands for stationary human (normal breathing and blinking eyes) in sitting or standing positions with no active signs for at least 30 seconds. Immune to environmental factors such as temperature, wind, sunlight, and dust/debris, the MM5D91-00 also comes with azimuth and elevation field of view of ±45° and ±40°. The MM5D91-00 communicates with MCU using the UART interface with the default baud rate of 115200bps for data transfer. In addition, it also uses several mikroBUS™ pins. An active-low reset signal routed on the RST pin of the mikroBUS™ socket activates a hardware reset of the radar module. It also has three general-purpose pins, routed to the AN, PWM,

and INT pins of the mikroBUS™ socket marked as GP2, GP1, and GP0 to signal an essential change in device status, alongside its green, red, and blue LED indicators. Green LED stands for active presence indication, while red LED represents non-presence indication. Blue LED serves for bootloader mode indication. This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Radar Click top side image
Radar Click lateral side image
Radar Click bottom side image

Features overview

Development board

EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.

Communication options such as USB-UART, USB DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

EasyPIC v8 horizontal image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

General Purpose 2
Power Supply
General Purpose 1
General Purpose 0
Power Supply

Take a closer look


Radar Click Schematic schematic

Step by step

Project assembly

EasyPIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.

EasyPIC v8 front image hardware assembly
Rotary B 2 Click front image hardware assembly
MCU DIP 28 hardware assembly
EasyPIC v8 28pin-DIP - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto DIP image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for Radar Click driver.

Key functions:

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

  • radar_get_temperature This function reads the chip internal temperature.

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

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

 * @file main.c
 * @brief Radar Click 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.
 * ## 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.
 * @author Stefan Filipovic

#include "board.h"
#include "log.h"
#include "radar.h"

static radar_t radar;
static log_t logger;

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 " );

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 );
            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 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support