#include <LiquidCrystal.h>

// Pin definitions
const int throttlePin = A0;   // Throttle potentiometer connected to analog pin A0
const int brakePin = A1;      // Brake sensor connected to analog pin A1
const int ledPin = 9;         // LED connected to digital pin 9 (PWM)
const int tempPin = A2;       // Temperature sensor connected to analog pin A2
const int buzzerPin = 8;      // Buzzer for warnings

// LCD pin definitions
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// Variables to store sensor values
int throttleValue = 0;
int brakeValue = 0;
int ledBrightness = 0;
int tempValue = 0;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Initialize LED pin as output
  pinMode(ledPin, OUTPUT);
  
  // Initialize buzzer pin as output
  pinMode(buzzerPin, OUTPUT);

  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("VCU Starting...");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read the throttle and brake values
  throttleValue = analogRead(throttlePin);
  brakeValue = analogRead(brakePin);
  tempValue = analogRead(tempPin);
  
  // Convert the throttle value to LED brightness (0-255)
  ledBrightness = map(throttleValue, 0, 1023, 0, 255);
  
  // Apply brake logic: if brake is applied, reduce LED brightness
  if (brakeValue > 500) { // Assuming a threshold value for the brake sensor
    ledBrightness = 0;
  }
  
  // Monitor temperature and activate buzzer if temperature is too high
  float temperature = tempValue * (5.0 / 1023.0) * 100; // Example conversion
  if (temperature > 60.0) { // Example threshold for overheating
    digitalWrite(buzzerPin, HIGH);
    ledBrightness = 0; // Turn off the LED for safety
    lcd.setCursor(0, 1);
    lcd.print("OVERHEATING!");
  } else {
    digitalWrite(buzzerPin, LOW);
  }
  
  // Write the brightness to the LED
  analogWrite(ledPin, ledBrightness);
  
  // Display values on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Throttle:");
  lcd.print(throttleValue);
  lcd.setCursor(0, 1);
  lcd.print("Brake:");
  lcd.print(brakeValue);
  lcd.setCursor(8, 1);
  lcd.print("Temp:");
  lcd.print(temperature);
  
  // Print values to the serial monitor for debugging
  Serial.print("Throttle: ");
  Serial.print(throttleValue);
  Serial.print(" Brake: ");
  Serial.print(brakeValue);
  Serial.print(" LED Brightness: ");
  Serial.print(ledBrightness);
  Serial.print(" Temp: ");
  Serial.println(temperature);
  
  // Small delay for stability
  delay(100);
}