#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int potentiometerPin = A0;
const int displayAddress = 0x27;
const int displayCols = 16;
const int buzzerPin = 7; 

LiquidCrystal_I2C lcd(displayAddress, displayCols, 2);

void setup() {
  lcd.begin(displayCols, 2);
  lcd.clear();
}

void loop() {
  int sensorValue = analogRead(potentiometerPin);
  int rpm = map(sensorValue, 0, 1023, 0, 6000);
  displayRPM(rpm);

  
  if (rpm > 0) {
    int baseFrequency = map(rpm, 0, 6000, 50, 150); 

    // Create a pattern for the engine sound
    for (int i = 0; i < 5; i++) {
      int frequency = baseFrequency + i * 20; 
      int duration = map(rpm, 0, 6000, 60, 15);

      tone(buzzerPin, frequency, duration);
      delay(duration);
    }
  } else {
    noTone(buzzerPin); 
  }

  delay(100);
}

void displayRPM(int rpm) {
  lcd.clear();
  lcd.setCursor(4, 0);
  lcd.print("RPM: ");
  lcd.print(rpm);

}