README.md

diagram.json

const int trigPin = 12;
const int echoPin = 14;
const int redPin = 19;
const int greenPin = 22;
const int bluePin = 23;
const int yellowPin = 21;
const int buzzerPin = 26;

// Define distance thresholds
const int farThreshold = 40;
const int midThresholdHigh = 35;
const int midThresholdLow = 25;


// Define buzzer channel
const int buzzerChannel = 3;

void setup() {
  // Set the RGB LED and buzzer pins as output
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(yellowPin, OUTPUT)
  pinMode(buzzerPin, OUTPUT);

  // Initialize Serial communication for debugging (optional)
  

  // Setup LED PWM
  ledcSetup(buzzerChannel, 2000, 12); // Adjust frequency based on your buzzer

  // Attach LED channels to GPIO pins
  ledcAttachPin(buzzerPin, buzzerChannel);
}

void loop() {
  int distance = getDistance();

  // Check the distance and control the RGB LED and buzzer accordingly
  if (distance == 0 || distance > farThreshold) {
    // Case 1: No obstacle or distance over 40 cm
    digitalWrite(greenPin, LOW);
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, LOW);
    digitalWrite(bluePin, HIGH);
    noTone(buzzerChannel);
  } else if (distance <= midThresholdHigh && distance > midThresholdLow) {
    // Case 2: Distance between 40-35 cm
    digitalWrite(greenPin, HIGH);
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, LOW);
    digitalWrite(bluePin, LOW); // Orange
    toneBuzzer(1000, 1000); // Start the buzzer (1 sec on, 1 sec off)
  } else if (distance <= midThresholdLow && distance > 0) {
    // Case 3: Distance between 35-25 cm
    digitalWrite(greenPin, LOW);
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, HIGH);
    digitalWrite(bluePin, LOW); // Red
    toneBuzzer(250, 250); // Start the buzzer (0.25 sec on, 0.25 sec off)
  } else {
    // Case 4: Distance lower than 25 cm
    digitalWrite(greenPin, LOW);
    digitalWrite(redPin, HIGH);
    digitalWrite(yellowPin, LOW);
    digitalWrite(bluePin, LOW); // Red
    ledcWriteTone(buzzerChannel, 2000); // Constant high-pitched sound
  }

  // Additional delay for stability (adjust if needed)
  delay(50);
}

// Function to get distance from ultrasonic sensor
int getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the pulse duration from the echo pin
  long duration = pulseIn(echoPin, HIGH);

  // Calculate distance in centimeters
  int distance = duration * 0.034 / 2;

  return distance;
}


// Function to control the buzzer with on-off intervals
void toneBuzzer(int onDuration, int offDuration) {
  ledcWriteTone(buzzerChannel, 1000); // Start the buzzer
  delay(onDuration);
  noTone(buzzerChannel); // Stop the buzzer
  delay(offDuration);
}
