Arduino Mega Simulator: Architecture Breakdown & Circuit Guide

const int ledPins[] = {22, 24, 26, 28};
const int numLeds = 4;

void setup() {
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  Serial.begin(9600);
  Serial.println("4-Channel Chaser Initialized");
}

void loop() {
  // Forward animation
  for (int i = 0; i < numLeds; i++) {
    digitalWrite(ledPins[i], HIGH);
    Serial.print("LED Active on Pin: ");
    Serial.println(ledPins[i]);
    delay(200);
    digitalWrite(ledPins[i], LOW);
  }

  // Reverse animation
  for (int i = numLeds - 2; i > 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    delay(200);
    digitalWrite(ledPins[i], LOW);
  }
}

const int potPin = A0;
const int ldrPin = A1;

void setup() {
  Serial.begin(9600);
  Serial.println("Mega Analog Telemetry Scanner Ready");
}

void loop() {
  int potValue = analogRead(potPin); // 0 to 1023
  int ldrValue = analogRead(ldrPin); // 0 to 1023

  float potVoltage = (potValue * 5.0) / 1023.0;

  Serial.print("Potentiometer: ");
  Serial.print(potValue);
  Serial.print(" (");
  Serial.print(potVoltage, 2);
  Serial.print("V) | Light Level: ");
  Serial.println(ldrValue);

  delay(300);
}

const int buttonPin = 2;
const int redLed = 8;
const int greenLed = 9;

int currentMode = 0;
int lastButtonState = HIGH;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  Serial.begin(9600);
  Serial.println("Mode Switcher Active. Press button to toggle.");
}

void loop() {
  int reading = digitalRead(buttonPin);

  // Detect button press (HIGH to LOW transition)
  if (reading == LOW && lastButtonState == HIGH) {
    currentMode = (currentMode + 1) % 2;
    Serial.print("Switched to Mode: ");
    Serial.println(currentMode == 0 ? "NORMAL (Red)" : "TURBO (Green)");
    delay(50); // Debounce delay
  }
  lastButtonState = reading;

  // Update outputs according to mode
  if (currentMode == 0) {
    digitalWrite(redLed, HIGH);
    digitalWrite(greenLed, LOW);
  } else {
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed, HIGH);
  }
}

const int trigPin = 11;
const int echoPin = 12;
const int buzzerPin = 7;
const int alertLed = 6;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(alertLed, OUTPUT);
  Serial.begin(9600);
  Serial.println("Mega Ultrasonic Sentinel Online");
}

void loop() {
  // Send 10-microsecond pulse
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2; // Convert to cm

  Serial.print("Measured Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Proximity trigger under 15cm
  if (distance > 0 && distance < 15) {
    digitalWrite(alertLed, HIGH);
    tone(buzzerPin, 1200); // 1.2 kHz alarm tone
  } else {
    digitalWrite(alertLed, LOW);
    noTone(buzzerPin);
  }

  delay(100);
}