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

const int speedSensorPin = A0;    // Analog pin for speed sensor
const int ledBulbPin = 13;        // Digital pin for LED bulb
const int buzzerPin = 9;          // Digital pin for buzzer
const int speedThreshold = 700;   // Threshold for over-speeding detection

LiquidCrystal_I2C lcd(0x27, 16, 2); 

void setup() {
  // put your setup code here, to run once:
  pinMode(speedSensorPin, INPUT);
  pinMode(ledBulbPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  lcd.begin(16, 2);
  lcd.print("Speed Monitor");
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int speed = readSpeed();  // Read speed from the sensor

    if (isOverSpeeding(speed)) {
      indicateOverSpeeding();
    } else {
      clearIndication();
    }

    updateLCD(speed);

    delay(1000);  // Simulate a delay between readings
}
int readSpeed() {
  // Simulate reading speed from the sensor 
  return analogRead(speedSensorPin);
}

bool isOverSpeeding(int speed) {
  return speed > speedThreshold;
}

void indicateOverSpeeding() {
  digitalWrite(ledBulbPin, HIGH);
  tone(buzzerPin, 1000, 500);  // Play a tone on the buzzer
  Serial.println("Over-speeding detected!");
}

void clearIndication() {
  digitalWrite(ledBulbPin, LOW);
}

void updateLCD(int speed) {
  lcd.setCursor(0, 1);
  lcd.print("Speed: " + String(speed) + "       ");  // Clear the line and print new speed
}