Traffic Light Controller Circuit Documentation

Summary

This circuit is designed to control a traffic light system using an Arduino UNO microcontroller. The traffic light system consists of three LEDs (Red, Yellow, and Green) that simulate a traffic signal. The Arduino UNO cycles through the LEDs in a specific sequence: Red is on for 5 seconds, followed by Yellow for 2 seconds, and then Green for 5 seconds. This sequence repeats indefinitely to mimic the operation of a standard traffic light.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0-A5, SCL, SDA, AREF, D0-D13
• Purpose: Acts as the central controller for the traffic light system, driving the LEDs and managing the timing of the light sequence.

Traffic Light

• Description: A simple traffic light module with three LEDs.
• Pins: Green, Yellow, Red, GND
• Purpose: Represents the traffic light, with each LED corresponding to a light on a standard traffic signal.

Wiring Details

Arduino UNO

• GND: Connected to the GND pin of the Traffic Light.
• D3: Connected to the Green LED of the Traffic Light.
• D2: Connected to the Yellow LED of the Traffic Light.
• D1: Connected to the Red LED of the Traffic Light.

Traffic Light

• Green: Connected to pin D3 on the Arduino UNO.
• Yellow: Connected to pin D2 on the Arduino UNO.
• Red: Connected to pin D1 on the Arduino UNO.
• GND: Connected to the GND pin on the Arduino UNO.

Documented Code

/*
 * This Arduino sketch controls a traffic light system.
 * The traffic light has three LEDs: Red, Yellow, and Green.
 * The sequence is as follows:
 * - Red LED on for 5 seconds
 * - Yellow LED on for 2 seconds
 * - Green LED on for 5 seconds
 * This sequence repeats indefinitely.
 */

// Pin definitions
const int redPin = 1;    // Red LED connected to pin D1
const int yellowPin = 2; // Yellow LED connected to pin D2
const int greenPin = 3;  // Green LED connected to pin D3

void setup() {
  // Initialize the digital pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  // Red LED on for 5 seconds
  digitalWrite(redPin, HIGH);
  delay(5000);
  digitalWrite(redPin, LOW);
  
  // Yellow LED on for 2 seconds
  digitalWrite(yellowPin, HIGH);
  delay(2000);
  digitalWrite(yellowPin, LOW);
  
  // Green LED on for 5 seconds
  digitalWrite(greenPin, HIGH);
  delay(5000);
  digitalWrite(greenPin, LOW);
}

File Name: norlis afni.ino

Note: The pin numbers in the code correspond to the digital pins on the Arduino UNO. The code controls the state of each LED by setting the pin HIGH (LED on) or LOW (LED off) and uses delays to manage the timing of the light sequence.