Arduino IR + LCD + Proteus8

Smart parking systems are innovative solutions that use sensors and microcontrollers to detect and display parking availability. This article explains how to build a basic smart parking system using Arduino, sensors, and an LCD display.

Components Used

1. Arduino Microcontroller: Serves as the brain of the system.
2. LCD Display (16x2): Displays the parking space statuses.
3. LED Indicator: Lights up if all parking spaces are occupied.
4. Two Digital Sensors: Detect whether parking spaces P1 and P2 are occupied or free.
5. Wires and Resistors: For connections.

Hardware Connections

1. LCD Connection: The LiquidCrystal library initializes an LCD object connected to digital pins 2-12. Each pin serves a specific purpose, such as data or control signals.
2. LED Pin: Connected to pin 13 for visual alerts when parking spaces are full.
3. Sensors: Connected to pins 6 and 0. Each sensor reads the state of a parking spot (HIGH for occupied, LOW for free).

Understanding the Code

Libraries and Variables

• #include <Wire.h> and #include <LiquidCrystal.h>: Libraries for I2C communication and LCD control.
• Variables p1 and p2: Represent the pins connected to parking sensors.
• THRESHOLD: Placeholder for possible future extensions, e.g., temperature monitoring.

Setup Phase

The setup() function configures:

1. Pin Modes:
   • pinMode(13, OUTPUT): Sets the LED as an output.
   • pinMode(p1, INPUT) and pinMode(p2, INPUT): Configure parking sensors as inputs.
2. LCD Initialization: Activates the LCD with a 16x2 configuration.
3. Serial Communication: Initializes the serial monitor for debugging.

Main Logic in loop()

1. Read Sensor States:
   • pl1 = digitalRead(p1): Reads the state of parking spot 1.
   • pl2 = digitalRead(p2): Reads the state of parking spot 2.
2. Update LCD:
   • Displays "Free" if the sensor reads LOW.
   • Displays "Full" if the sensor reads HIGH.
3. LED Control:
   • If both spots are occupied (pl1 * pl2 == 1), the LED lights up. Otherwise, it remains off.
4. Delay:
   • Introduces a 500ms delay to avoid flickering.

Key Features of the System

1. Real-Time Updates:
   • LCD displays the status of parking spots in real-time.
2. Alert System:
   • An LED warns when both parking spaces are occupied.
3. Efficient Logic:
   • Uses simple conditional checks to toggle display and LED.

How It Works

1. Initial State: The system starts by initializing the LCD and sensors.
2. Parking Spot Status:
   • Sensors connected to p1 and p2 detect vehicles in the respective parking spots.
   • The LCD displays "P1 Free" or "P1 Full" for parking spot 1, and similarly for parking spot 2.
3. LED Alert:
• Lights up when both parking spots are occupied.

Future Enhancements

1. Add More Sensors: To accommodate additional parking spaces.
2. Remote Monitoring: Use Wi-Fi or Bluetooth to transmit parking status to a smartphone app.
3. Expand Display: Show additional information such as the number of free spots.

By understanding and implementing this code, you can create a basic yet effective smart parking system. This project is a great starting point for learning about microcontrollers and embedded systems.