Seeeduino Xiao Expansion Board Ultrasonic Distance Sensor

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• HC-SR04 Ultrasonic Range Measurement Module
• Seeeduino XIAO Expansion board
• Seeeduino XIAO
• Jumper wires
• Visuino program: Download Visuino

• Powerful CPU: ARM® Cortex®-M0+ 32bit 48MHz microcontroller(SAMD21G18) with 256KB Flash, 32KB SRAM
• Flexible compatibility: Compatible with Visuino & Arduino IDE
• Easy project operation: Breadboard-friendly
• Small size: As small as a thumb(20x17.5mm) for wearable devices and small projects.
• Multiple development interfaces: 11 digital/analog pins, 10 PWM Pins, 1 DAC output, 1 SWD Bonding pad interface, 1 I2C interface, 1 UART interface, 1 SPI interface.

Typical Application

• Wearable devices
• Rapid prototyping (directly attached to the expanded PCB as a minimal system)Perfect for all the projects need mini Arduino
• DIY keyboard
• USB development (USB to multi-channel TTL/USB host mode, etc.)
• A scenario where you need to read multiple mock values The DAC output

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• Place the Seeeduino XIAO on the Expansion board
• Connect Ultrasonic sensor pin [VCC] to Expansion board pin [5V]
• Connect Ultrasonic sensor pin [GND] to Expansion board pin [GND]
• Connect Ultrasonic sensor pin [Trig] to Expansion board digital pin [0]
• Connect Ultrasonic sensor pin [ECHO] to Expansion board digital pin [1]'

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The Visuino: https://www.visuino.eu also needs to be installed. Download Free version or register for a Free Trial.

Start Visuino as shown in the first picture Click on the "Tools" button on the Arduino component (Picture 1) in Visuino When the dialog appears, select "Seeeduino XIAO" as shown on Picture 2

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• Add "Ultrasonic Ranger" component
• Add "Analog Multi Source" component
• Add "OLED I2C" component
• Add "Compare Analog Value" component
• Add "Play Frequency Tone" component
• Select "AnalogMultiSource1" and in the Properties window set "Output Pins" to 3
• Select "CompareValue1" and in the Properties window set "Compare Type" to ctSmaller and "Value" to 5

This means that the Piezo will beep if the distance is less than 5cm

• Select "PlayFrequency1" and in the Properties window select "Enabled" and click on the Pin Icon and select "Boolean SinkPin" and set "Initial Frequency (Hz)" to 15

Double click on the "DisplayOLED1" and in the "Elements" window:

• Drag "Draw Text" to the left & in the properties window set "Size" to 2 and "Text" to Distance
• Drag "Text Field" to the left & in the properties window set "Size" to 3 and "Y" to 30
• Close the "Elements" window
• Connect "Seeeduino XIAO" Digital pin [1] to "UltrasonicRanger1" pin [Echo]
• Connect "UltrasonicRanger1" pin[Ping] to "Seeeduino XIAO" Digital pin [0]
• Connect "UltrasonicRanger1" pin[Out] to "AnalogMultiSource1" pin [In]
• Connect "AnalogMultiSource1" pin [0] to "CompareValue1" pin[In]
• Connect "AnalogMultiSource1" pin [1] to "DisplayOLED1" > "Text Field1" pin [In]
• Connect "AnalogMultiSource1" pin [2] to "DisplayOLED1" > "Text Field1" pin [Clock]
• Connect "CompareValue1" pin [Out" to "PlayFrequency1" pin [Enabled"
• Connect "PlayFrequency1" pin [Out" to "Seeeduino XIAO" Digital pin [3]

Connect "DisplayOLED1" I2C Pin [Out] to "Seeeduino XIAO" I2C Pin [In]"

• Connect "DisplayOLED1" I2C Pin [Out] to "Seeeduino XIAO" I2C Pin [In]"

In Visuino, at the bottom click on the "Build" Tab, make sure the correct port is selected, then click on the "Compile/Build and Upload" button.

If you power the Seeeduino XIAO module, the Display will start to show Ultrasonic distance of the objects. If the object is closer than 5cm a piezo will start to beep.

Congratulations! You have completed your project with Visuino. Also attached is the Visuino project, that I created for this Tutorial, you can download it and open it in Visuino: https://www.visuino.eu