NXP Semiconductors SLN-VIZNLC-IOT-UG User manual

SLN-VIZNLC-IOT-UG
SLN-VIZNLC-IOT User Guide
Rev. 0 — 20 February 2023 User guide
Document information
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Keywords Smart Lock, Smart Access, IoT
Abstract This document describes the low-cost vision solution, also called SLN-VIZNLC-IOT, and its
associated out of box features. The SLN-VIZNLC-IOT turnkey solution provides OEMs with a fully
integrated, self-contained, software, and hardware solution

NXP Semiconductors SLN-VIZNLC-IOT-UG
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1 Introduction
The SLN-VIZNLC-IOT development kit implements NXP Edge Ready turnkey solution for face recognition-
based access control, using an RGB+IR dual camera module. This kit includes the LPC845 low-power control,
i.MX RT106F runtime library, and pre-integrated machine learning face recognition algorithms, as well as all
required drivers for peripherals, such as memories, cameras, display, Bluetooth Low Energy (Bluetooth LE),
and Wi-Fi (optional). This cost-effective, easy-to-use solution facilitates the deployment of highly accurate face
recognition with robust liveness detection capability. By leveraging an MCU platform, this solution can deliver
the low cost and low power consumption required for battery-powered consumer smart locks, combined with the
quick inferencing, and short boot times required to deliver a great user experience.
Target applications:
•Smart door locks: For consumer and hospitality applications, including single family homes, multiple dwelling
units, and hotels.
•Access control: For office and industrial smart-building applications.
1.1 Processor overview
The i.MX RT106F is an Edge Ready member of the i.MX RT1060 family of crossover processors, targeting
low cost embedded face recognition applications. It features an advanced Arm Cortex-M7 core implementation
from NXP that operates at up to 600 MHz to provide high CPU performance and the best real-time responses.
This i.MX RT106F based solution enables system designers to add face recognition capabilities easily and
inexpensively to a wide variety of smart appliances, smart homes, and smart industrial devices.
The i.MX RT106F processor is licensed to run NXP i.MX RT run-time library for face recognition which may
include:
•Unified cross-platform framework.
•Camera drivers, image capture, and pre-processing.
•Face detection, tracking, alignment, recognition with quantified results and confidence measure, and liveness
detection.
•Display drivers, 2D graphics accelerator supported.
•Built-in security, bootloader, and application validation.
•All drivers including Bluetooth LE and Wi-Fi.
•USB Mass Storage Device (MSD) updates.
•Factory automation scripts.
•Supported by an MCUXpresso SDK, IDE, and configuration tools.
Note: The Wi-Fi feature is enabled in the second SW release.
In addition to the i.MX RT106F, the LPC845 is another Arm Cortex-M0+ core-based processor. The LPC845 is
a low-cost, 32-bit MCU operating at frequencies of up to 30 MHz and supports up to 64 kB of flash memory and
16 kB of SRAM. It features exceptional power efficiency in the low-current mode, and includes rich peripheral
complement I/O ports.
2 Recommended configuration
An up-to-date computer that can run MCUXpresso IDE version is required to modify and debug the SLN-
VIZNLC-IOT example projects (11.6.1 or newer).
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Computer type OS version Terminal program
Apple MAC OS PuTTY
PC Windows 7/10/11 PuTTY/Tera Term
PC Linux PuTTY
Table 1. Recommended computer configuration
3 Hardware
The SLN-VIZNLC-IOT turnkey solution for face recognition comes with a cost and form-factor-optimized
hardware reference designs and access to full software source code. In addition to the i.MX RT106F and
LPC845 MCUs, rich peripherals are provided to help develop applications. Figure 1 shows the main hardware
resources of the board.
PIR
User
Button
LCD
IR+RGB
Dual Camera
USB
TypeC
LPC845
Wi-Fi M.2
Connector
RT106F
SDRAM
LCD
Connector
K32W061
PCB
Antenna
SPI Flash
RT106F
Reset
LPC845
Reset
RT/LPC/BT
Programming
Header
Speaker
Boot Mode
Jumper
Figure 1. SLN-VIZNLC-IOT components
For more information about the hardware design of the SLN-VIZNLC-IOT, see the SLN-VIZNLC-IOT Hardware
Developer Guide (document SLN-VIZNLC-IOT-HDG).
CAUTION: Depending on the mode of operation, the SLN-VIZNLC-IOT kit can emit highly concentrated white
or non-visible infrared light which can be hazardous to human eyes. Products which incorporate these devices
must follow the safety precautions given in IEC 60825-1 and IEC 62471.
3.1 MCU
In the SLN-VIZNLC-IOT design, the LPC845 manages the low-power control of the entire system and works as
the host MCU. The i.MX RT106F is used to run camera preview, display, and machine learning algorithms.
The power supply of the i.MX RT106F part is controlled by the LPC845. However, by connecting the J11 jumper,
an always-on power mode is enabled for easy debugging. See the box highlighted in green in Figure 6.
3.2 LCD
The SLN-VIZNLC-IOT kit, by default, uses a 2.4 inch TFT display (Rocktech RK024HH298) with 240 x 320
resolution, LED backlight, full viewing angle, and RGB interface.
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3.3 Speaker
A GSPK1345PN-1M8R1W-L80 enclosed 8 Ω 1.0 W speaker is embedded in the SLN-VIZNLC-IOT kit.
3.4 Camera module
The SLN-VIZNLC-IOT kit uses the GC0308 IR+RGB dual camera module by default. The GC0308 features 640
V x 480 H resolution with 1/6.5-inch optical format, and 4-transistor pixel structure for high image quality and low
noise variations. It delivers superior image quality by powerful on-chip design of a 10-bit ADC, and embedded
image signal processor. The two GC0308 sensors share a single CSI-DVP interface.
3.5 Wireless radios
Usage condition
The following information is provided per Article 10.8 of the Radio Equipment Directive 2014/53/EU:
•Frequency bands in which the equipment operates.
•The maximum RF power transmitted.
PN RF technology Frequency range Maximum
transmitted power
SLN-VIZNLC-IOT Bluetooth 2402-2480 MHz 10 dBm
Table 2. Bluetooth frequency and power
EUROPEAN DECLARATION of CONFORMITY (Simplified DoC per Article 10.9 of the Radio Equipment
Directive 2014/53/EU)
This apparatus, namely SLN-VIZNLC-IOT, conforms to the Radio Equipment Directive 2014/53/EU. For the full
EU Declaration of Conformity for this apparatus, see SLN-VIZNLC-IOT.
4 RT106F bootloader
The SLN-VIZNLC-IOT employs a multi-stage boot process to enhance the capabilities of the out-of-box
firmware (FW) to include additional functionality. For instance, the ability to flash new firmware images remotely
and without a debugging probe for the i.MX RT106F.
4.1 Normal boot
By default, if no boot flags are set during the boot phase, the Normal Boot mode is used. During Normal Boot,
the bootloader boots into the "main" out-of-box demo application, meaning the bootloader has jumped to the
flash address associated with the application.
4.2 Boot modes
The bootloader supports several different boot-up methods which augment the boot-up behavior. These
methods include Normal Boot mode (default) and MSD mode for drag-and-drop flashing of new firmware
images. The following sections describe the usage of each different Boot mode and how to enable them.
A high-level overview of the purpose of each of these features is discussed in the following sections. For
information regarding their usage, creating update payloads, and more, see SLN-VIZNLC-IOT Software
Developer Guide (document SLN-VIZNLC-IOT-SDG).
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4.3 Mass Storage Device
The MSD feature allows the SLN-VIZNLC-IOT to receive firmware updates without a debugging probe like
a SEGGER J-Link. Instead, MSD uses USB to emulate an MSD interface like the one that is used for USB
flash drives. This feature can be especially useful for marketers or engineers in the field without access to a
dedicated debug probe tool. When the kit is powered on, hold down the MSD pushbutton (SW3) on the front of
the kit to activate MSD mode.
Figure 2. MSD pushbutton (SW3)
Once enabled, the kit enumerates as a USB Storage Device by the OS of your computer.
Figure 3. New USB drive for SLN-VIZNLC-IOT kit
To update the firmware image on your kit, drag and drop the new binary to the USB drive corresponding to
your kit. Assuming the binary is properly generated, the bootloader automatically updates the firmware on your
device. Flashing a new firmware image results in a pop-up window identical to the one used when copying files
to a real USB flash drive device.
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Figure 4. Copying new binary to the USB drive
Note:
•Keep the i.MX RT106F in always-on power mode, when using MSD.
•Only the main application can be updated using MSD. The bootloader cannot be updated using MSD and
requires the use of a SEGGER J-Link Debug Probe or the Factory Programming Flow. Instructions on MSD,
J-Link-based updates, and the Factory Programming Flow can be found in the SLN-VIZNLC-IOT Software
Developer Guide (document SLN-VIZNLC-IOT_SDG).
For more information regarding MSD mode and its usage, and instructions on generating FW binaries
compatible with MSD mode, see the SLN-VIZNLC-IOT Software Developer Guide (document SLN-VIZNLC-
IOT-SDG).
5 Out-of-box demo application
5.1 Overview
The SLN-VIZNLC-IOT supports Smart Lock (default) and Smart Access applications. These example
applications are built to showcase the complex machine vision, voice prompt, and graphical UI capabilities the
kit supports. They also provide a base software platform for rapid integration of unique customer applications
and requirements.
The Smart Lock application presents an example of a potential smart lock use case. Here, a smart lock device
provides custom user experiences using face recognition.
The Smart Access application presents an example of a potential smart access use case. Here, a smart
access device provides custom user experiences using face recognition.
The main difference between the two applications is the images used for face recognition. Face recognition
uses IR images for smart lock applications and RGB images for smart access applications.
If you want to build the smart access application, change the symbol definition from "SMART_LOCK_2D" to
"SMART_ACCESS_2D" in the project settings.
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Figure 5. How to build Smart Access application
5.2 Smart Lock
The following sections describe the out-of-box features of smart lock in default. It also applies to smart access
application, except for few GUI display.
5.2.1 Power on
Take the USB-A > USB-C cable provided inside the kit. Plug the USB-A end into the USB port on your computer
and the USB-C end into the USB port of the kit.
Figure 6. Power on the SLN-VIZNLC-IOT kit
Note: LPC845 controls the power supply of i.MX RT106F and K32W061. However, an always-on power mode
is supported for easy debugging by connecting J11 jumper as shown in the box highlighted in green in Figure 6.
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When powered 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.
Figure 7. The screen with video preview
When J11 is not connected and no PIR event is triggered after a 30 s timeout, the entire system enters the low-
power mode. Now, the screen is off and the power supply of i.MX RT106F is cut off. When new PIR event is
triggered, the system wakes up immediately.
When J11 is connected, the screen is always on. The i.MX RT106F is powered on all the time, and face
recognition does not stop working.
5.2.2 Register a face
To begin registering a new face, press the Manual Registration button (SW4) on the kit or use shell command
(add username). For shell commands, see the description later.
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Figure 8. 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.
Figure 9. Registering screen
Figure 9 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 indicates how
much longer it takes until the registration procedure times out and fails.
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Figure 10. Registration Timeout
As an additional measure to aid in registering your face, the kit even plays a warning audio prompt, saying
"Look at Camera," until your face is properly pointed toward the camera, if too much of the side of your face is
exposed during the registration process.
Should your face fail 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.
Figure 11. Registration Successful
5.2.3 Recognize a face
Once registered, the kit displays the message "Recognition Successful" and plays a corresponding audio file
when a recognized face is detected.
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Figure 12. Recognition Successful
5.2.4 Deregister
If the application recognizes a face, the user may delete it using Manual Deregistration button (SW3).
Figure 13. Manual Deregistration Button (SW3)
This process permanently deletes the face.
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Figure 14. Deregistering Screen
5.2.5 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.
Figure 15. Printed picture and phone display spoof attack
As shown in the Figure 15, using a phone display or a printed picture of a face does not trigger the “Recognition
Successful” message.
5.2.6 Shell commands
The smart lock/access out-of-box FW provides additional configuration options via a shell interface hosted over
a USB virtual COM connection.
To connect to the shell interface, use a serial terminal emulator program like PuTTY, Tera Term, or Minicom.
Configure the serial connection settings as follows and make sure to use the COM port corresponding to your
kit:
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•Speed: 115200
•Data: 8 bit
•Parity: None
•Stop bits: 1 bit
•Flow control: None
The shell commands for the smart lock/access application are listed in Table 3.
Shell command Meaning
help List all the registered commands
exit Exit program
version oasis Get the version of the current oasis library
version Get the version of the current software
reset Reset the board
save Save all registered users to flash
add username Add user
del -n <username> Delete user by user name
del -i <id> Delete user specified by id
del -a Delete all users
rename <id>new name Rename user based on id
list Prints a list of all users currently saved in the face database
list -c Print the number of users currently saved in the face
database
log_level <none/error/debug/info/verbose> Set the log level
log_level Get the log level
display_output <UVC/panel> Set the display device
display_output Get display device
display_output source <RGB/2DIR> Set display source
display_output source Get display source
ir_pwm <value> Set PWM pulse width for IR LED, value should be between 0
(inactive) and 100 (max)
white_pwm <value> Set PWM pulse width for white LED, value should be
between 0 (inactive) and 100 (max)
volume <value> Set volume of the speaker,value should be between 0
(muted) and 100 (max)
oasis <start/stop> Start/stop oasis
oasis info Get the state of oasis
facerec_threshold Show the current face recognition threshold
facerec_threshold <value> Set the face recognition threshold
Table 3. Shell commands
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5.2.7 Remote registration
The Smart Lock/Access application allows you to register and de-register faces locally using the onboard
pushbuttons or serial commands. This application also supports remote face management over Bluetooth
LE using an Android phone/tablet application. The Smart Lock Manager app for Android smartphones and
tablets provides a user-friendly interface where you may remotely register new faces and manage faces that
are already registered in the SLN-VIZNLC-IOT local face database. This section describes some major features
provided by this dedicated Android app.
5.2.8 Installing the Smart Lock Android app manually
The pre-compiled APK and the complete source code for the Smart Lock Manager app are available on the
SLN-VIZNLC-IOT under the Software and Tools section. They can also be obtained from GitHub repository.
To install the Smart Lock Manager app on your Android device, store the Smart_Lock_Manager.apk file on
your smart device. First, download it directly from the web browser of your device or by transferring it from your
computer to your device. Ensure that the third-party apps are allowed on your Android device before you install
it. Search for the APK file location on your Android device using the Files app. Tap it to authorize installation
from the file manager, and then wait for the installation to complete.
Figure 16. Installing the Smart Lock Manager app for Android
After launching the Smart Lock Manager app for the first time, you are prompted to authorize the app to access
the camera of your smart device, your location to enable Bluetooth, and your photographs. It is important that
you approve those services to connect new kits or register new faces.
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Figure 17. Allowing camera, location, and photograph access
If Bluetooth radio is off, the app prompts you to enable it on your Android device. To pair your kit with the Smart
Lock Manager app and remotely manage the registered faces stored in the SLN-VIZNLC-IOT local database,
Bluetooth connectivity is required.
Figure 18. Enabling Bluetooth
Note: The Smart Lock Manager app is intended for use as an evaluation tool and as a reference/boilerplate
upon which a customized smartphone/tablet companion application is built.
5.2.9 Managing kits
To interact with your SLN-VIZNLC-IOT kit, pair your kit with the Smart Lock Manager app which can be done
from the main menu of the app. To detect the VIZNLC devices that are within the Bluetooth range of your
Android device, press the "DEVICE SCAN" button.
Note: The Bluetooth LE feature of the SLN-VIZNLC-IOT is enabled by default, so the app automatically
discovers the kit shortly after powering up.
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Any VIZNLC kits found while the search is in progress are shown in the "Device" list. Select the device that you
want to add to your list of supported smart locks.
Note: For easy identification, each kit transmits a distinct Bluetooth SSID that begins with VN and includes its
serial number.
Figure 19. Pairing with a new board
To secure the connection between your Android device and the SLN-VIZNLC-IOT kit that you want to access,
enter a password before logging in to your device. This password is set to 000000 by default.
Figure 20. Smart lock password screen
The Android app displays a list of users who are currently registered in the kit local face database when
securely connected with the VIZNLC device.
Note: Only one device can be connected and controlled at a time.
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Figure 21. Smart lock list of users currently registered
By selecting the “Change Password” command, you can modify the password previously registered to secure
the Bluetooth connection with the smart lock device. Enter the old password and the new password and click
“Change”. The app automatically returns to the previous "Smart Lock Control" menu. A message is displayed in
green at the bottom of the screen to confirm that the new password is successfully pushed to the device.
Figure 22. Changing smart lock password
5.2.10 Managing users
5.2.10.1 Adding users
One of the key features of the Smart Lock Manager app is registering new faces remotely from any Android
device and uploading them to the VIZNLC device via Bluetooth. To start the remote registration process, tap the
“ADD USER” button, as shown in Figure 23.
The Smart Lock Manager app automatically displays the live view of the front camera of your Android device.
A green bounding box appears when your face is detected. To register your face, click the shutter icon at the
bottom of the camera view while the box around your face is green.
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The app asks you to type a name of the new face. Tap the blue checkmark icon and select “REGISTER” to
finalize the registration.
Figure 23. Registering a new face remotely
The app automatically returns to the list of registered users for the selected smart lock device, where the
recently added face has been added via the Android device.
To trigger a local registration remotely, go to the "Commands" menu and choose the "Registration" option. It has
the same effect as pressing the local Registration button (SW4) on the kit.
Figure 24. Trigger a local registration remotely
Note: If you locally register, update, or delete a face using the smart lock device, select the “Sync” option in
the app. This option alerts the Android device of any modifications made locally on the kit for users. A sync is
automatically performed when you connect to a board.
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Figure 25. Sync option to update the face databases in the Android app and the kit
5.2.10.2 Modifying users
The Smart Lock Manager app also enables you to modify registered users. From the list of the Smart Lock
registered users, select the user that you want to modify. The available options are "Delete User", "Update
Name", and "Reregister".
Figure 26. Managing registered users
To modify a name of the user, choose "Update Name", type the new user name, and select "Update" to save the
information.
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Figure 27. Renaming a registered user
Note: If you locally register, update, or delete a face using the smart lock device, select the “Sync” option in
the app. This option alerts the Android device of any modifications made locally on the kit for users. A sync is
automatically performed when you connect to a board.
5.2.10.3 Deleting users
In addition to adding and modifying registered users, the Smart Lock Manager app also allows you to delete
registered users. From the list of the Smart Lock registered users, select the user that you want to delete. To
delete the user, select the "Delete User" option, and confirm by selecting "DELETE" to remove the user.
Figure 28. Remote deletion screen
To trigger a local deregistration remotely, go to the "Commands" menu and choose the "Registration" option. It
has the same effect as pressing the Deregistration button (SW3) on the board.
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