Introduction

Easy DIY Project with Arduino UNO Q If you’re starting with the new Arduino UNO Q and wondering what your first real project should be — this one is perfect. In this tutorial, we’ll build a real-time ultrasonic radar (technically SONAR) using: Arduino UNO Q HC-SR04 Ultrasonic Sensor SG90 Servo Motor Python + Web UI (HTML, CSS, JavaScript) Within minutes, your Arduino will:

• Rotate a servo
• Scan distances
• Send data to Linux
• Host a local webpage
• Draw a live radar animation in your browser

No blinking LEDs. This is a proper embedded visualization project.  

Why Start With This Arduino UNO Q Project?

Arduino UNO Q is Arduino’s first SBC (Single Board Computer). It’s a dual-brain board: STM32 MCU → real-time hardware control Qualcomm MPU → Linux, Python, Web UI So instead of simple code sketches and contorl, you can build full systems. This radar project shows exactly how both processors work together.

What Are We Building?

  A rotating ultrasonic radar: Servo sweeps from 30° to 150° Ultrasonic sensor measures distance Arduino sends angle + distance Python receives data Browser draws radar graphics Result: A live sonar screen in your web browser.  

Chapter 1 – Hardware Requirements

 

Main Components

Arduino UNO Q

HC-SR04 Ultrasonic Sensor

SG90 Servo Motor

Supporting Parts

Breadboard

Jumper wires

USB-C cable

Optional (for standalone mode):

HDMI display

Keyboard

Mouse

USB hub

Power supply

 

Chapter 2 – Wiring Connections

 

Ultrasonic Sensor Pins

VCC

GND

TRIG

ECHO

 

Servo Motor Wires

Red → VCC

Brown → GND

Orange → Signal

 

Arduino UNO Q Connections Servo

Orange → D6

Red → 5V

Brown → GND

 

Ultrasonic Sensor

TRIG → D9

ECHO → D10

VCC → 5V

GND → GND

Make sure all grounds are common.

Double-check wiring before powering up.

 

Chapter 3 – Programming Logic

 

UNO Q allows something powerful:

You run C++ on STM32 and Python + Web on Linux

Data Flow STM32 → Route Bridge → Qualcomm Processor → Python → Web UI

Arduino Side (C++)

The microcontroller:

Moves servo from 30° to 150°

Sends ultrasonic pulse

Measures echo time

Calculates distance

Returns:

angle,distance

Only two values.

Simple.

These values are exposed through Arduino’s Router Bridge.

 

Python Side

Python continuously calls:

Bridge.call("get_radar")

Then:

Splits angle and distance

Sends data to browser using WebUI

Runs in background thread for smooth UI

Web Side (HTML + CSS + JavaScript)

HTML

Creates:

Canvas for radar

Distance text

Loads Socket.IO

Loads JavaScript

Minimal structure.

CSS

Your radar look:

body{ background:black; color:#00ff00; text-align:center; font-family:Consolas; }

canvas{ border:2px solid #00ff00; box-shadow:0 0 25px #00ff00; margin-top:10px; }

#dist{ margin-top:10px; font-size:20px; }

Classic green-on-black radar theme.

JavaScript

JavaScript:

Listens for radar_update

Updates angle and distance

Clears canvas

Draws grid

Draws sweep line

Plots detected objects

Runs ~60 FPS for real-time motion.

Summary of Software Flow

Arduino measures Python forwards Browser draws

Hardware → Browser → Live radar.

CODE

 

Chapter 4 – Final Assembly

 

Mount ultrasonic sensor on servo

Fix components on breadboard/base

Secure wires

Place Arduino UNO Q

Connect display (if standalone)

Power ON

Your radar hardware is ready.

 

 

Chapter 5 – Testing & Working

 

Upload the code.

Open local webpage.

And boom.

Servo sweeps

Sensor scans

Radar beam rotates

Dots appear

Distance updates live

Move your hand.

Dots move instantly.

You just built a real-time SONAR visualization system.

 

Technologies Used

Arduino UNO Q

HC-SR04 Ultrasonic Sensor

SG90 Servo Motor

STM32 (C++)

Qualcomm Linux Processor

Python

HTML

CSS

JavaScript

Socket.IO

 

What Did You Really Build?

Not just a project.

You built:

• Embedded system
• Sensor processing
• Inter-processor communication
• Python backend
• Web frontend
• Real-time visualization

That’s serious engineering.

 

Final Thoughts

 

This project doesn’t use the full power of UNO Q.

But it’s the perfect starting point.

If you think Arduino is only for LEDs…

UNO Q will change your mind.

 Watch Detail video on - https://www.youtube.com/@RobuInlabs