Circuit Documentation

Summary of the Circuit

This circuit is designed to create an Arduino-based car parking system. It utilizes an Arduino UNO as the central microcontroller to manage inputs from infrared (IR) sensors and control an LCD screen and a servo motor. The IR sensors detect the presence of a car, the LCD screen displays the parking system status and available slots, and the servo motor acts as a barrier that opens or closes based on the parking availability.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Purpose: Acts as the central processing unit of the parking system, reading sensor inputs, controlling the servo motor, and updating the display on the LCD screen.

IR Sensors

• Description: Infrared sensors used for detecting the presence of objects.
• Purpose: To detect the presence of cars entering or leaving the parking area.

LCD Screen 16x2 I2C

• Description: A 16x2 character LCD display with an I2C interface.
• Purpose: To display the status of the parking system and the number of available slots.

Servo

• Description: A rotary actuator or motor that allows for precise control of angular position.
• Purpose: To act as a barrier that opens or closes based on parking slot availability.

Wiring Details

Arduino UNO

• 5V: Connected to the VCC pins of both IR sensors, the LCD screen, and the Servo.
• GND: Connected to the GND pins of both IR sensors, the LCD screen, and the Servo.
• D2: Connected to the 'out' pin of one IR sensor.
• D3: Connected to the 'pulse' pin of the Servo.
• D4: Connected to the 'out' pin of the other IR sensor.
• SCL: Connected to the SCL pin of the LCD screen.
• SDA: Connected to the SDA pin of the LCD screen.

IR Sensors

• VCC: Connected to the 5V output from the Arduino UNO.
• GND: Connected to the ground (GND) on the Arduino UNO.
• Out: One sensor's output is connected to D2 on the Arduino UNO, and the other sensor's output is connected to D4.

LCD Screen 16x2 I2C

• VCC: Connected to the 5V output from the Arduino UNO.
• GND: Connected to the ground (GND) on the Arduino UNO.
• SCL: Connected to the SCL pin on the Arduino UNO.
• SDA: Connected to the SDA pin on the Arduino UNO.

Servo

• VCC: Connected to the 5V output from the Arduino UNO.
• GND: Connected to the ground (GND) on the Arduino UNO.
• Pulse: Connected to D3 on the Arduino UNO.

Documented Code

Arduino UNO Code

// Viral Science www.viralsciencecreativity.com www.youtube.com/c/viralscience
// Arduino Car Parking System

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F,16,2);  //Change the HEX address
#include <Servo.h> 

Servo myservo1;

int IR1 = 2;
int IR2 = 4;

int Slot = 4;           //Enter Total number of parking Slots

int flag1 = 0;
int flag2 = 0;

void setup() {
  lcd.begin();
  lcd.backlight();
  pinMode(IR1, INPUT);
  pinMode(IR2, INPUT);
  
  myservo1.attach(3);
  myservo1.write(100);

  lcd.setCursor (0,0);
  lcd.print("     ARDUINO    ");
  lcd.setCursor (0,1);
  lcd.print(" PARKING SYSTEM ");
  delay (2000);
  lcd.clear();  
}

void loop(){ 

  if(digitalRead (IR1) == LOW && flag1==0){
    if(Slot>0){
      flag1=1;
      if(flag2==0){
        myservo1.write(0); 
        Slot = Slot-1;
      }
    }else{
      lcd.setCursor (0,0);
      lcd.print("    SORRY :(    ");  
      lcd.setCursor (0,1);
      lcd.print("  Parking Full  "); 
      delay (3000);
      lcd.clear(); 
    }
  }

  if(digitalRead (IR2) == LOW && flag2==0){
    flag2=1;
    if(flag1==0){
      myservo1.write(0); 
      Slot = Slot+1;
    }
  }

  if(flag1==1 && flag2==1){
    delay (1000);
    myservo1.write(100);
    flag1=0, flag2=0;
  }

  lcd.setCursor (0,0);
  lcd.print("    WELCOME!    ");
  lcd.setCursor (0,1);
  lcd.print("Slot Left: ");
  lcd.print(Slot);
}

Filename: sketch.ino

(Note: The second microcontroller instance does not have associated functional code and is therefore not included in this documentation.)