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Estimated reading time: 7 minutes
Following the previous tutorial on the “Face Detection Alarm”, in this tutorial, we will teach you how to use the Weili camera to create a “Face Detection Warning Light”. By applying artificial intelligence and the face recognition function of the Weili camera, the LED light will activate when a face is detected. Here are the materials needed for this tutorial:
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Weili board and expansion board
StepsStep 1: Combine the Weili board with the expansion board
Step 2: Install the LED light on the Weili board Step 3: Connect the Weili camera to the computer Step 4: Adjust the Weili camera settings Step 5: Connect the Weili camera to the Weili board Step 6: Use Scratch for programming Step 7: Upload the program to the Weili board
First, combine the Weili board with the expansion board.
Install the LED light in the fourth and fifth slots on the blue area above D4 on the Weili board.
Use a Micro USB 2.0 cable to connect the Weili camera to your personal computer.
When the green, blue, and red LED lights are lit, it indicates that the Weili camera is successfully connected.
Don’t forget to remove the lens cover!
Open the CZL smart sensor tool, set the function to “face recognition”, and click apply.
Once the settings are complete, aim the lens at a face for testing to see if it can successfully recognize faces. After testing, close the CZL smart sensor tool and unplug the Micro USB 2.0 cable from the Weili camera.
Connect the Weili camera to the “UART” slot on the Arduino expansion board.
Open Weili camera Junior for Scratch programming. The following steps will teach you how to build the “Face Detection Warning Light” step by step.
Drag out the “Initialize” block from the “Control” section and the “Initialize SmartSensor” block from the “Smart Sensor” section.
Place the “Initialize SmartSensor” block into the “Initialize” block.
Adjust the parameters of the “Initialize SmartSensor” block: “RX#” (input) to 0, and “TX#” (output) to 1. This step ensures that the Weili board and Weili camera can connect correctly.
B. Object Detection Loop Design
In this process, we will design a loop to make the LED light blink. First, drag out the “If() Then()” block from the “Control” section and place the “Detected Object” block from the “Smart Sensor” section into the “If” section. This means that if the Weili camera detects an object, it will perform the actions in the “Then” section.
Next, drag out another “If() Then()” block and place it in the “Then” section.
Drag out the “() = ()” block from the “Logic” section and place the “Object Type” and “0” from the “Smart Sensor” section into the “() = ()” block.
Note that the symbol in the “() = ()” block must be “equals”.
Place the adjusted “() = ()” block into the second layer of the “If() Then()” block.
Drag out two “Built-in LED State()” blocks from the “Input/Input” section and set their parameters to high and low.
Place the two “Built-in LED State()” blocks into the “Then” section of the second layer “If() Then()” block.
Next, drag out the “Delay()(seconds)” block from the “Control” section. Since we want to create a blinking effect for the LED light, please set the “Delay()(seconds)” to 100 milliseconds, which will create a short delay of 100 milliseconds when the LED light turns on. (You can also set it according to your preference.) Place the “Delay()(seconds)” block between the two “Built-in LED State()” blocks.
Finally, drag out the “Repeat While()()” block from the “Control” section and place the “Detected Object” block from the “Smart Sensor” section into the “Repeat While()” section.
Place the “Repeat While()()” block under the second “Built-in LED State()” block.
The following is the entire “Face Detection Warning Light” Scratch program block group. Before uploading to the Weili board, please check if the structure is correct.
After completing the Scratch program code, upload the code to the Weili board.
A. Connect the Weili board to your personal computer
First, use a Micro USB 2.0 cable to connect the Weili board to your personal computer.
B. Upload the program code
In the upper right corner of Weili camera Junior, select “Arduino UNO” from the “Select Hardware” dropdown menu to connect.
Then select the appropriate COM port from the “Serial Port List” dropdown menu to connect. If there is no current connection, the “Serial Port List” will display “Not Connected”.
If you cannot find the corresponding COM port, there is a “Refresh” button in the “Serial Port List” dropdown menu to update. The COM port will have different models depending on the device; the tutorial uses COM5.
When you see “Connected”, click “Return to Editor” to go back to Weili camera Junior.
Finally, click the “Upload” button to upload the program code to the Weili board.
When “Upload Successful” appears, you can start using the face detection warning light.
First, click “Save As-Ctrl+Shift+S” in the “Project” dropdown menu in the upper right corner. You can also use the shortcut Ctrl+Shift+S.
After clicking, a save window will appear immediately. Choose a save location, enter a project name, and press the save button. After saving, you can check if the file type is Scratch 3 Project (.sb3) at the save location.
Practical Operation:Once you have completed the above steps, it’s time to play with the “Face Detection Warning Light”! Aim the Weili camera at a face and test if the LED light blinks on and off. You can also apply this “Face Detection Warning Light” in your daily life!
Weili Creative is an artificial intelligence education brand under the VIA Group, dedicated to providing youth artificial intelligence education solutions, integrating smart hardware, smart software platforms, curriculum systems, teacher training, competition activities, level examinations, and AI laboratory projects into one. The teaching targets cover all academic stages, and the teaching scenarios involve classroom teaching, club activities, and experimental teaching in a comprehensive and multi-scenario manner, creating customized comprehensive solutions for artificial intelligence education.
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