Arduino project · Distance and parking · Easy
Ultrasonic Servo Gate
The gate arm lifts when an object comes within 20 cm and drops when it goes away.
What you will learn
- How to open a barrier with a sensor
- How a servo makes the arm move
- How to choose the trigger distance
How it works
The distance is checked over and over. Below 20 cm the servo goes to 90 degrees (open). Otherwise it goes to 0 degrees (closed).
Try this next
- Add a short delay so the gate stays open a little longer.
- Add red and green LEDs.
- Add a buzzer warning when closing.
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
An automatic car-park barrier
Move the distance slider. When a car comes close, the barrier arm lifts, like the gate at a car park or a toll plaza.
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.
- Distance sensor = the sensor watching for cars
- Servo = the barrier arm