HD Radar – Live Ultrasonic Scanner with 1.8" TFT

🧠 Project Idea

This project transforms an Arduino Uno into a visual radar system that uses an ultrasonic sensor (HC-SR04) and a servo motor to scan its surroundings and graphically displays the data live on a 1.8-inch TFT display (ST7735).

🛠️ Components Used

• Arduino Uno
• 1x HC-SR04 Ultrasonic Sensor
• 1x 1.8" TFT SPI Display (ST7735)
• 1x Servo Motor (e.g., SG90)
• Various Jumper Wires
• 5V Power Supply

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📐 Functionality

The servo rotates the ultrasonic sensor within an angle range of 0° to 180°. The distance is measured at each step. The results are displayed on a half-radar on the TFT:

• Green: Background lines (angle and distance circles)
• Red: Detected objects (points)
• Live display of angle & distance in the upper left corner
• Elegant loading screen at startup with logo and progress bar

The visualization is intuitive, clear, and makes the project ideal for technical demonstrations, school projects, or DIY robotics.

🖥️ Display Setup

• Semicircular radar scheme
• Distance labeling (10 cm to 40 cm)
• Angle indication via a rotating green line
• “HD Robotics” branding and URL at the bottom

Tutorial Video :

🔁 Control

• The servo continuously sweeps from 0° to 180° and back
• The distance is continuously measured
• Points disappear when objects are no longer detected

🔋 Power Supply

The project can be powered directly via USB or an external 5V source. Ensure sufficient power for the servo and display.

💾 Code

The complete Arduino sketch for this project is included above and ready to use. Simply install the libraries:

• Adafruit_GFX
• Adafruit_ST7735
• Servo

🌐 More Information

🔗 More projects at: www.hdrobotics.de
📸 Tip: Position the radar, for example, on a table by a window – this way you can detect people or objects in real-time that are within the detection range!