Traffic light using Arduino Uno

Here's a simple guide to create a traffic light project using Arduino:

Components Needed
- Arduino Board (e.g., Arduino Uno)
- 3 LEDs (Red, Yellow, Green)
- 3 Resistors (220-ohm or suitable for your LEDs)
- Breadboard and jumper wires

Circuit Setup
1. Connect the LEDs to digital pins on the Arduino:
    - Red LED to pin 9
    - Yellow LED to pin 10
    - Green LED to pin 11
2. Connect each LED's cathode (short leg) to a resistor, and then connect the other end of the resistor to a GND pin on the Arduino.

Code
const int redPin = 9;
const int yellowPin = 10;
const int greenPin = 11;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  // Red light
  digitalWrite(redPin, HIGH);
  digitalWrite(yellowPin, LOW);
  digitalWrite(greenPin, LOW);
  delay(5000); // Wait 5 seconds

  // Green light
  digitalWrite(redPin, LOW);
  digitalWrite(yellowPin, LOW);
  digitalWrite(greenPin, HIGH);
  delay(5000); // Wait 5 seconds

  // Yellow light
  digitalWrite(redPin, LOW);
  digitalWrite(yellowPin, HIGH);
  digitalWrite(greenPin, LOW);
  delay(2000); // Wait 2 seconds
}
How it Works
1. The `setup()` function sets the LED pins as outputs.
2. The `loop()` function simulates a traffic light sequence:
    - Red light for 5 seconds
    - Green light for 5 seconds
    - Yellow light for 2 seconds

Upload and Enjoy!
Upload the code to your Arduino board, and the traffic light sequence should start! 🚦

Do you have any questions about this project or would you like to add more features (e.g., pedestrian signals, timer displays)?

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