Our Arduino radar project is simple but you can develop this radar by the same technique.

How Radar Works?

The term RADAR, coined first time by US Navy in 1940 and accepted widely by other countries. Radar is an acronym for RAdio Detection And Ranging. in this post, we will make an Arduino Radar Project. We’ll use UltraSonic Transceiver for detecting and ranging objects in a specific range from our Arduino radar. as we use the sonic wave to detect objects our radar called SONAR too. SONAR is an acronym for SOund NAvigation Ranging. ships and submarines using SONAR for detecting their environment.

all of the Radars using Reflection phenomenon as their main principle. Maybe you’ve experienced sound reflection in mountains. Our Arduino Radar works in the same way. first, we send an ultrasonic wave for a short time then wait for receiving the reflection of this wave. if we don’t get any reflections this means our detection range is clear and nothing exists in our radar range. when we receive a response, we find that an object placed in front of our radar and we can measuring distance by a simple formula.

Distance (d) = Speed of Sound (v=343 m/s) * delay between send and receive in seconds (t) / 2

Components & Parts

  • Arduino Board ……………………………………………………….. BangGood
  • Servo Motor ……………………………………………………………. BangGood
  • Ultrasonic Transceiver Module ( HC-SR04 ) ……… BangGood
  • Breadboard …………………………………………………………….. BangGood
  • DuPont Wires …………………………………………………………. BangGood

Assemble The Radar Project

Most of the ultrasonic transceivers like HC-SR04 that we use in this project has a narrow beam angle (less than 15 deg). But for building a radar we need wide beam angle (more than 180 deg ). to solve this problem we should move our ultrasonic sensor continuously and split around the environment to narrow angles. To need to fix our ultrasonic transceiver on the top of servo motor shaft. by moving shaft we can scan different angles. for example, if our radar sensor beam angle is 15 degree, we should rotate servo motor shaft 12 times, each time 15 deg to provide a 180-degree view.

Plexiglas Ultrasonic Mounting Bracket

To fix your sensor on servo motor you have different choices. You can use 3d printed brackets, Plexiglas brackets or your handmade bracket with plastic or cardboard to fix ultrasonic sensors on servo motor.

You can buy some types of Mounting Brackets from below links.

  • Plexiglass Ultrasonic Transceiver Mounting Bracket… BangGood

Now Its time to wiring! We need to connect both transceiver and motor to an Arduino board. Arduino board is the brain of our project and control different components as a single system.

We need to connect the servo motor signal pin to Arduino output. use pin 12 of Arduino as servo controller. connect Trigger pin of Ultrasonic module to pin 11 and ECHO to pin 10.

Coding

After building the structure of our SONAR project, it’s time to write code for the Arduino board to interact with the Servo / HC-SR04 & PC. Arduino should scan environment trough Sensor and Servo and send data to PC for monitoring.

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