NXP Semiconductors SLN-VIZNLC-IOT Manuale utente
SLN-VIZNLC-IOT-GSG
SLN-VIZNLC-IOT Getting Started Guide
Rev. 0 — 10 March 2023 User guide
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Information Content
Keywords SLN-VIZNLC-IOT-GSG, Smart Lock, IoT
Abstract This guide walks you through the process of getting up and running with your SLN-VIZNLC-IOT
board
NXP Semiconductors SLN-VIZNLC-IOT-GSG
SLN-VIZNLC-IOT Getting Started Guide
1 Plug it in
Welcome to the SLN-VIZNLC-IOT Getting Started Guide.
This guide walks you through the process of getting up and running with your SLN-VIZNLC-IOT board. This
guide takes you through the steps of unboxing your kit, running the out-of-box smart lock demo application, as
well as downloading, modifying, and debugging the firmware source code for your kit.
Before we begin, make sure to check the box your kit came in for any marks or other damages, and should you
find anything, be sure to report it to your local NXP representative.
2 Smart Lock
2.1 Unbox
The box your kit arrives in should contain a few different things, including:
•A packing list paper
•Fully assembled VIZNLC kit
•USB-A > USB-C Cable (x1)
•Jumpers (x2)
Figure 1. Items inside the box
2.2 Power on
Before we begin, put a jumper on J3 (pin 2 and 3 on the left side) as shown in the yellow highlighted box in
Figure 35. Then remove the protective film from the RGB and IR camera as shown in Figure 2. This protective
film is used to protect the lens of each camera during transport. However, failure to remove may cause the
image capture not to work correctly.
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Figure 2. Protective film covering the two cameras: RGB and IR
To get started, follow the steps below:
1. Take the USB-A > USB-C cable provided inside the kit. Plug the USB-A end into USB port on your computer
and the USB-C end into the USB port of the kit. The USB connector of the kit supplies power to the board
and supports data transfer capabilities for Mass Storage Device (MSD) programming and virtual serial port
communication.
Figure 3. Power on the SLN-VIZNLC-IOT kit
2. Once the application is ready, your computer detects a new USB COM device, and automatically installs the
required drivers. A message confirms when the installation is completed.
3. After powering on, the onboard TFT screen streams video directly from the RGB camera alongside a GUI
overlay, providing information such as:
•Locked/Unlocked status whether a face is recognized
•Current App Type (Smart Lock/Access)
•ON/OFF status of Wi-Fi and Bluetooth LE
•Number of registered users
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SLN-VIZNLC-IOT Getting Started Guide
Figure 4. The screen with video preview
2.3 Register and recognize a face
Let us get started with a demonstration of the out-of-box features of this application.
To use the recognition feature of the SLN-VIZNLC-IOT, a face must be registered in the local face database of
the kit. To begin registering a new face, press the Manual Registration button (SW4) on the kit.
Figure 5. Manual Registration button (SW4)
Once pressed, a message indicating registration is taking place pops up at the top of the screen. The speaker
plays an audio message confirming that the registration has started.
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Figure 6. Registering screen
Figure 6 shows that while registration is taking place, the GUI displays:
•A “Registering” message
•Face alignment guidelines
•A countdown timer bar
The guidelines help you align your face correctly during registration, and the countdown timer bar indicates how
much longer it takes until the registration process times out and fails.
Figure 7. Registration Timeout
As an additional measure to help with registering your face, the kit even plays a warning audio prompt if too
much of the side of your face is exposed during the registration process, saying “Look at Camera”. The kit plays
this warning audio until your face is properly pointed toward the camera.
Should your face fails to register, simply press the SW4 button again to retry.
Once your face is successfully registered, the kit displays the message "Registration Successful", and a unique
identifier is assigned to your face. The number of registered users is also updated automatically.
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Figure 8. Registration Successful
Once registered, the kit displays the message “Recognition Successful” and plays a corresponding audio file
when a recognized face is detected.
Figure 9. Recognition Successful
2.4 Liveness detection and anti-spoofing
The Liveness detection and anti-spoofing features of the SLN-VIZNLC-IOT are switched ON by default.
Therefore, enabling the system to distinguish between your actual face and a printout or phone display image of
your face.
This feature helps to defend against some of the most frequent face recognition "spoof" attacks.
One such spoof attack is when a malicious actor uses a picture of someone to gain access to their face-
protected materials. The malicious actor does this spoof by requiring an actual face of the user to unlock the
system rather than simply a picture of their face.
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Figure 10. Printed picture and phone display spoof attack
As shown in Figure 10 using a phone display or a printed picture of a face does not trigger the “Recognition
Successful” message.
2.5 Connect to serial CLI
The Smart Lock software installed by default on the SLN-VIZNLC-IOT kit provides a convenient serial-based
CLI. This CLI is used to retrieve useful runtime data and configure various application settings. Connecting to
the serial-based CLI of the kit can be done using a serial terminal emulator program like PuTTY or Tera Term.
Before we begin, make sure that you have a serial terminal emulator like PuTTY or Tera Term installed on your
computer.
Figure 11. PuTTY and Tera Term
Note: If you are using a Windows machine, we recommend Tera Term for its ability to discover connected COM
devices automatically. Additionally, if there is a disconnect, Tera Term reconnects to a device.
Establish a serial connection with your device by entering the serial settings as shown in Figure 12. Ensure to
replace the COM port setting with the COM port associated with your kit.
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Figure 12. Serial port setup
Once connected, a blank terminal screen appears that echoes back any characters that you type. Typing the
help command prints a list of all available commands and a brief description of their functionalities.
Figure 13. Help menu
3 Build and run
3.1 Getting MCUXpresso IDE
The MCUXpresso IDE brings developers an easy-to-use eclipse-based development environment for NXP
MCUs based on Arm Cortex-M cores, including its general-purpose crossover and wireless-enabled MCUs.
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The MCUXpresso IDE offers advanced editing, compiling, and debugging features. It also offers MCU-specific
debugging views, code trace and profiling, multicore debugging, and integrated configuration tools.
To download MCUXpresso IDE, follow the steps below:
1. Go to MCUXpresso IDE homepage and click the Downloads button.
Figure 14. MCUXpresso IDE homepage
2. The Downloads page appears. Next, click the Download button.
Figure 15. Downloads page
3. The Sign In page appears. Login with your credentials.
Figure 16. Sign In page
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4. Once you have signed in, select Version 11.6.1 or newer from the list.
Figure 17. Select Version page
5. The Software Terms and Conditions page appears. Read the conditions and click the I Agree button.
Figure 18. Software terms and conditions page
6. The Product Download page appears from where you can download the MCUXpresso IDE. Download the
appropriate version for your system.
Figure 19. Product Download page
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