Circuit Documentation

Summary

This circuit is designed to control a traffic light using an Arduino UNO and a joystick module. The traffic light has three LEDs (red, yellow, and green) that are controlled by the joystick's position. When the joystick is moved in different directions, the corresponding LED lights up on the traffic light. The joystick also has a built-in switch that can be used for additional input if needed.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins Used: 5V, GND, A0, A1, D2, D3, D4, D7.
• Purpose: Acts as the central controller for the circuit, reading inputs from the joystick and driving the traffic light LEDs.

Traffic Light

• Description: A simple traffic light module with three LEDs (green, yellow, red).
• Pins Used: Green, Yellow, Red, GND.
• Purpose: Provides visual output corresponding to the joystick's position.

Joystick Module

• Description: A module with a two-axis joystick and a pushbutton switch.
• Pins Used: SW, VRY, VRX, VCC, GND.
• Purpose: Serves as the user input device to control the traffic light LEDs.

Wiring Details

Arduino UNO

• 5V to Joystick module VCC
• GND to Joystick module GND, Traffic Light GND
• A0 to Joystick module VRX
• A1 to Joystick module VRY
• D2 to Traffic Light Red
• D3 to Traffic Light Yellow
• D4 to Traffic Light Green
• D7 to Joystick module SW

Traffic Light

• Green to Arduino UNO D4
• Yellow to Arduino UNO D3
• Red to Arduino UNO D2
• GND to Arduino UNO GND

Joystick Module

• VCC to Arduino UNO 5V
• GND to Arduino UNO GND
• VRX to Arduino UNO A0
• VRY to Arduino UNO A1
• SW to Arduino UNO D7

Documented Code

/*
 * This Arduino sketch controls a traffic light using a joystick module.
 * When the joystick is moved up, the red LED turns on.
 * When the joystick is moved left, the yellow LED turns on.
 * When the joystick is moved right, the green LED turns on.
 * When the joystick is moved down, all LEDs turn on.
 */

const int redLED = 2;       // Connects to the red LED on the traffic light
const int yellowLED = 3;    // Connects to the yellow LED on the traffic light
const int greenLED = 4;     // Connects to the green LED on the traffic light
const int joystickSW = 7;   // Connects to the switch on the joystick
const int joystickVRX = A0; // Connects to the X-axis on the joystick
const int joystickVRY = A1; // Connects to the Y-axis on the joystick

void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(joystickSW, INPUT);
  Serial.begin(9600);
}

void loop() {
  int xValue = analogRead(joystickVRX);
  int yValue = analogRead(joystickVRY);
  Serial.print("X: ");
  Serial.print(xValue);
  Serial.print(" Y: ");
  Serial.println(yValue);

  if (yValue < 300) { // Joystick moved up
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
  } else if (xValue < 300) { // Joystick moved left
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(greenLED, LOW);
  } else if (xValue > 700) { // Joystick moved right
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, HIGH);
  } else if (yValue > 700) { // Joystick moved down
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(greenLED, HIGH);
  } else { // Joystick in neutral position
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
  }
  delay(100);
}

This code is designed to be uploaded to the Arduino UNO microcontroller. It initializes the pins connected to the LEDs and joystick, reads the joystick's analog values, and controls the traffic light LEDs based on the joystick's position. Serial output is provided for debugging purposes.