Arduino Based Smart Car Parking Sensor Circuit

Today parking is big problem everywhere, so here, parking become easy with this Arduino idea; we made small Arduino Based Smart Car Parking Sensor Circuit.

This system detects car and display free or busy slot automatic, then Arduino brain tell LCD which slot is free.

Therefore, there is no confusion, no searching, just smart slot information, as this is a simple circuit with smart working and great for beginners.

Arduino Code:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo gate;

int sensor1 = 2;
int sensor2 = 3;

int s1 = 0;
int s2 = 0;

void setup() {
lcd.begin(16,2);
lcd.backlight();
gate.attach(9);

pinMode(sensor1, INPUT);
pinMode(sensor2, INPUT);

lcd.print("Parking System");
delay(1500);
lcd.clear();
}

void loop() {
s1 = digitalRead(sensor1);
s2 = digitalRead(sensor2);

int busy = 0;

if(s1 == LOW) busy++;
if(s2 == LOW) busy++;

int freeSlot = 2 - busy;

lcd.setCursor(0,0);
lcd.print("Busy:");
lcd.print(busy);
lcd.print(" Free:");
lcd.print(freeSlot);

if(freeSlot > 0) {
lcd.setCursor(0,1);
lcd.print("Gate Open ");
gate.write(90);
} else {
lcd.setCursor(0,1);
lcd.print("Gate Closed ");
gate.write(0);
}

delay(300);
}

Coding Explanation:

• Include libraries.
• Create LCD object.
• Create servo object.
• Set pin modes for IR sensors.
• Read sensor values.
• Count how many slots is busy.
• Calculate free slots.
• Show values on LCD.
• If free slot is available then servo turns 90 degree (open).
• If no free slot then servo goes 0 degree (closed).

Circuit Working:

Parts List:

Components	Quantity
Arduino Uno	1
IR Sensor	2
Servo Motor	1
LCD 16×2	1
I2C Module	1

To begin with, Arduino gets power from the circuit, IR sensors turn ON and then sensors check for car.

If the beam remains unblocked, the slot stays free; the Arduino then detects the free slot, the LCD displays a “Free” message, and the servo gate remains closed.

After that, car comes and beam breaks and sensor output changes and Arduino reads busy slot and then LCD shows busy.

Now servo opens gate if any slot is free and if all slots are busy then Arduino closes the gate and then LCD shows no space.

When car leaves then beam becomes clear again and then Arduino updates slot as free, and finally, system repeats this continuously.

Formulas:

IR sensor works like simple digital switch, its output is either 0V or 5V and servo angle uses pulse width.

Angle = (pulseWidth − 1000) × 0.18

Example:

Pulse 1500µs

Angle = (1500 – 1000) * 0.18

Angle = 500 * 0.18 = 90 degree

Slot formula:

FreeSlots = TotalSlots − BusySlots.

Example:

BusySlots = 1

Hence, free slots = 2 – 1 = 1

How to Build:

To build a Arduino Based Smart Car Parking Sensor Circuit follow the below steps:

• First, take all the parts as shown in circuit diagram.
• After that, IR Sensor1 VCC pin connect to Arduino 5V, GND pin go to Arduino GND and OUT pin go to Arduino D2
• Then IR Sensor2 VCC pin connect to Arduino 5V, GND pin go to Arduino GND and then OUT pin go to Arduino D3
• Further, Servo Motor VCC pin connect to (red) wire to 5V, GND pin (brown) wire to GND and Signal pin (yellow) wire to D9
• Now I2C LCD Module VCC pin goes to Arduino 5V, GND pin go to Arduino GND, SDA pin go to A4 and SCL pin go to A5

Conclusion:

To conclude, Arduino Based Smart Car Parking Sensor Circuit is very easy and useful, also IR sensors detect vehicles.

Then LCD show slot status and finally, servo act like gate.

Moreover, this circuit works well for a car parking model and uses simple logic, low cost components and an easy to learn design.