// Constans for digital pins
const int usTrig = 13; // Digital pin for the trigger signal
const int usEcho = 12; // Digital pin for the echo signal
const int BuzzerPin1 = 4; // Digital pin for the buzzer
const int BuzzerPin2 = 3; // Digital pin for the buzzer

// Constant for the analog pin
const int potPin = A0; // Analog pin for the potentiometer

// Variables for the ultrasonic sensor
float duration, distance;

 
int condition;
// Variable for the potentiometer value
int potValue;

void setup() {
  // Setup for digital pins
  pinMode(usTrig, OUTPUT); // Sets the trigger pin as an output
  pinMode(usEcho, INPUT); // Sets the echo pin as an output
  pinMode(BuzzerPin1, OUTPUT); // Sets the buzzer pin as an output
  pinMode(BuzzerPin2, OUTPUT); // Sets the buzzer pin as an output

  // No setup for analog pin required (no need to set pinMode for analog input)

  // Initialise serial communication
  Serial.begin(9600);
}


void loop() {
readUltrasonic();
readPot();
MotionSensor();
delay(1000);
}

// Reading a digital input
void readUltrasonic() {
  // Send a low pulse to ensure the trigger pin is low
  digitalWrite(usTrig, LOW);
  delayMicroseconds(2); // Wait for 2 microseconds

  // Send a high pulse to trigger the ultrasonic sensor
  digitalWrite(usTrig, HIGH);
  delayMicroseconds(10); // Wait for 10 microseconds to ensure the pulse is sent
  digitalWrite(usTrig, LOW); // Set the trigger pin back to low

  // Measure the duration of the echo pulse
  duration = pulseIn(usEcho, HIGH);

  // Calculate the distance based on the direction
  // Speed of sound is approximately 0.0343 cm/us
  // Dividing by 2 because the pulse travels to the object and back
  distance = (duration * 0.0343) / 2;

  // Display the calculated distance
  Serial.print("Distance: ");
  Serial.println(distance);

}

// Reading an analog input
void readPot() {
  potValue = analogRead(potPin); // Read the value from the potentiometer (0-1023)

  // Display the potentiometer value
  Serial.print("Potentiometer Value: ");
  Serial.println(potValue);

}

void potentiometermap() {
  condition = map(potValue, 0, 1023, 2, 400);
  Serial.print("condition Value: ");
  Serial.println(condition);
}

void MotionSensor() {
  readPot();
  readUltrasonic();
  potentiometermap();

  

  if (distance < condition)
  {
    // Map the potentiometer value (0-1023) to a PWM value (0-255)
    // int pwmValue = map(potValue, 0, 1023, 0, 255);

    // Generate the tone at a specific frequecy

    // Tone (pin, freq, duration)

    tone(BuzzerPin1, 100, 150);
    
    tone(BuzzerPin2, 150, 150);
  }
}