Arduino project · Distance and parking · Medium
Smart Parking: Four Slots with LEDs
Each parking slot has an IR sensor and a red LED. The green LED shows that the car park is FULL.
What you will learn
- How parking systems detect cars
- How to light one LED per slot
- How to find out that all slots are full
How it works
A red LED lights for every occupied slot. The green "FULL" LED is switched on first and then off again if any slot is free.
Try this next
- Show the number of free slots on a 7-segment display.
- Add a barrier gate with a servo.
- Add a buzzer when the lot is full.
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 car park with four slots
Switch the IR sensors on and off. The cars park in the slots, and the LEDs show which slots are taken.
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.
- IR sensor 1 to 4 = a car in each slot
- Red LED 1 to 4 = slot taken
- Green LED = car park full