Arduino project · Distance and parking · Medium
Ultrasonic Radar Scanner
A servo turns an ultrasonic sensor around like a radar. Objects appear as green dots on the radar screen.
What you will learn
- How a radar scan works
- How a servo gives the angle
- How to alarm when something is close
How it works
The servo turns 6 degrees every 0.12 s. At each angle the sensor measures the distance. The radar screen shows what it found. Anything closer than 120 cm sets off the buzzer and the red LED.
Try this next
- Sweep back and forth.
- Show the angle and distance on an LCD.
- Find the biggest gap to drive through.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A radar scanning the surroundings
The servo turns the ultrasonic sensor. The beam finds each object and the buzzer warns when one is close.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- Servo = turns the sensor
- Ultrasonic sensor = the distance
- Buzzer + LED = close warning