Project 2.9.4: Traffic Barrier Gate

Description	This project controls a servo barrier that opens when the Traffic Light shows Green and closes when it shows Red, simulating a railway crossing.
Use case	This project can be used in railway crossing simulations, automated gate systems, parking access control, and traffic management systems, where a barrier is synchronized with traffic signals to control safe vehicle or pedestrian movement.

Components (Things You will need)

Building the circuit

Things Needed:

• Arduino Uno = 1
• Arduino USB cable = 1
• Traffic light module = 1
• Servo motor = 1
• Breadboard = 1
• Jumper wires

Mounting the component on the breadboard

Step 1: Place the Traffic Light Module on the breadboard following the circuit diagram.

NB: Make sure all components are securely placed on the breadboard with correct orientation.

WIRING THE CIRCUIT

Step 2: Connect the Signal (Orange/Yellow) wire of the Servo Motor to Digital Pin 9 on the Arduino Uno using male-to-male jumper wire.

Step 3: Connect the VCC (Red) wire of the Servo Motor to 5V on the Arduino Uno using male-to-male jumper wire.

Step 4: Connect the GND (Brown/Black) wire of the Servo Motor to the GND pin on the Arduino Uno using male-to-male jumper wire.

Step 5: Connect the Green LED pin of the Traffic Light Module to Digital Pin 4 on the Arduino Uno using male-to-male jumper wire.

Step 6: Connect the Yellow LED pin of the Traffic Light Module to Digital Pin 5 on the Arduino Uno using male-to-male jumper wire.

Step 7: Connect the Red LED pin of the Traffic Light Module to Digital Pin 6 on the Arduino Uno using male-to-male jumper wire.

Step 8: Connect the GND pin of the Traffic Light Module to GND on the Arduino Uno using male-to-male jumper wire.

Make sure to connect the Arduino USB cable to the Arduino board.

PROGRAMMING

Step 1: Open your Arduino IDE. See how to set up here: Getting Started.

Step 2: Type the following code in your Arduino IDE: #include <Servo.h>, const int greenLED = 4;, const int yellowLED = 5;, const int redLED = 6;, const int servoPin = 9;, Servo barrier; as shown in the image below.

Step 3: Type the following code in your Arduino IDE inside the void setup() function: pinMode(greenLED, OUTPUT);, pinMode(yellowLED, OUTPUT);, pinMode(redLED, OUTPUT);, barrier.attach(servoPin);, barrier.write(0); as shown in the image below.

Step 4: Type the following code in your Arduino IDE inside the void loop() function: digitalWrite(greenLED, HIGH);, digitalWrite(yellowLED, LOW);, digitalWrite(redLED, LOW);, barrier.write(0);, delay(5000);, digitalWrite(greenLED, LOW);, digitalWrite(yellowLED, HIGH);, digitalWrite(redLED, LOW);, delay(2000);, digitalWrite(greenLED, LOW);, digitalWrite(yellowLED, LOW);, digitalWrite(redLED, HIGH);,barrier.write(90);, delay(5000); as shown in the image below.

Uploading the code

Step 1: Save your code. See the Getting Started section

Step 2: Select the Arduino board and port. See the Getting Started section

Step 3: Upload your code.

CONCLUSION

This project helps learners understand how to combine multiple components with Arduino to create more complex interactive systems and automation solutions.