Project 2.11.3: Manual Traffic Speed Dial

Description	This project uses a potentiometer to control the cycling speed of a Traffic Light Module, allowing the user to speed up or slow down the light sequence in real-time.
Use case	This project can be used in automation systems, interactive installations, and embedded control applications.

Components (Things You will need)

Building the circuit

Things Needed:

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

Mounting the component on the breadboard

Step 1: Place the Potentiometer and the Traffic Light Module on the breadboard.

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

WIRING THE CIRCUIT

Step 2: Connect one outer pin of the Potentiometer to GND pin on the Arduino Uno using male-to-male jumper wires.

Step 3: Connect the other outer pin of the Potentiometer to 5V pin on the Arduino Uno using male-to-male jumper wires.

Step 4: Connect the middle pin of the Potentiometer to Analog pin A0 on the Arduino Uno using male-to-male jumper wires.

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

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

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

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

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: const int potPin = A0;, const int greenLED = 4;, const int yellowLED = 5;, const int redLED = 6;, int potValue;, int delayTime; as shown in the image below.

Step 3: Type the following code in your Arduino IDE inside the void setup() pinMode(greenLED, OUTPUT);, pinMode(yellowLED, OUTPUT);, pinMode(redLED, OUTPUT);, Serial.begin(9600); as shown in the image below.

Step 4: Type the following code in your Arduino IDE inside the void loop() potValue = analogRead(potPin);, delayTime = map(potValue, 0, 1023, 200, 2000);, Serial.print("Delay Time: ");, Serial.print(delayTime);, Serial.println(" ms"); as shown in the image below.

Step 5: Type the following code in your Arduino IDE inside the void loop() digitalWrite(greenLED, HIGH);, digitalWrite(yellowLED, LOW);, digitalWrite(redLED, LOW);, delay(delayTime); as shown in the image below.

Step 6: Type the following code in your Arduino IDE inside the void loop() digitalWrite(greenLED, LOW);, digitalWrite(yellowLED, HIGH);, digitalWrite(redLED, LOW);, delay(delayTime); as shown in the image below.

Step 7: Type the following code in your Arduino IDE inside the void loop() digitalWrite(greenLED, LOW);, digitalWrite(yellowLED, LOW);, digitalWrite(redLED, HIGH);, delay(delayTime); 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.