#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27 for a 16x2 I2C LCD

const int sensorPin = A0;  // RPM sensor input pin
const int potPin = A1;      // Slide potentiometer input pin
const int rpmMin = 700;     // Minimum RPM
const int rpmMax = 8000;    // Maximum RPM
const int lcdWidth = 16;    // LCD width
const int barWidth = 15;    // Width of the bar graph
const int numReadings = 10; // Number of readings to average

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("RPM:");

  // Set up serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Array to store sensor readings
  int sensorReadings[numReadings];
  int sensorTotal = 0;

  // Take multiple sensor readings and calculate average
  for (int i = 0; i < numReadings; i++) {
    sensorReadings[i] = analogRead(sensorPin);
    sensorTotal += sensorReadings[i];
    delay(10); // Delay between readings
  }

  // Calculate average sensor reading
  int sensorAverage = sensorTotal / numReadings;

  // Map average sensor value to RPM
  int rpm = map(sensorAverage, 0, 1023, rpmMin, rpmMax);

  // Print RPM on LCD
  lcd.setCursor(5, 0);
  lcd.print("    "); // Clear previous RPM value
  lcd.setCursor(5, 0);
  lcd.print(rpm);

  // Display RPM as a bar graph
  int barLength = map(rpm, rpmMin, rpmMax, 0, barWidth);
  lcd.setCursor(0, 1);
  for (int i = 0; i < barLength; i++) {
    lcd.print("#");
  }
  for (int i = barLength; i < barWidth; i++) {
    lcd.print(" ");
  }

  // Debugging: print RPM value to serial monitor
  Serial.println(rpm);

  delay(100); // Adjust as needed for responsiveness
}