#include <LiquidCrystal.h>
LiquidCrystal lcd(2,3,4,5,6,7);

#define sensor A0  
#define relay1 8
#define relay2 9
#define relay3 10
#define buzzer 13  

int read_ADC;
int distance;

byte symbol[8] = {
        B00000, B00100, B00100, B00100,
        B11111, B01110, B00100, B00000
};

void setup() {
  Serial.begin(9600); // 1. Start the Serial Monitor to see raw data

  pinMode(sensor,INPUT); 
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(buzzer, OUTPUT);

  lcd.createChar(1, symbol);    
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0); 
  lcd.print("Welcome to Cable");
  lcd.setCursor(0, 1); 
  lcd.print("Fault  Detection");
  delay(1500);
  lcd.clear();
}

void loop(){
  lcd.setCursor(1,0);
  lcd.print("R");
  lcd.write(1);  

  lcd.setCursor(7,0);
  lcd.print("Y");
  lcd.write(1); 

  lcd.setCursor(13,0);
  lcd.print("B");
  lcd.write(1); 
          
  // --- RED PHASE ---
  digitalWrite(relay1, HIGH);  // HIGH turns the Wokwi relay ON
  digitalWrite(relay2, LOW);   // LOW turns it OFF
  digitalWrite(relay3, LOW);  
  delay(150); // Give the virtual relay time to click
  
  Serial.print("Red ADC: ");
  data();
  lcd.setCursor(0,1);
  if(distance>0){lcd.print(distance); lcd.print("KM  ");}
  else{lcd.print(" NF ");}

  // --- YELLOW PHASE ---
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, HIGH); // Turn Yellow Relay ON
  digitalWrite(relay3, LOW);  
  delay(150);
  
  Serial.print("Yellow ADC: ");
  data();
  lcd.setCursor(6,1);
  if(distance>0){lcd.print(distance); lcd.print("KM  ");}
  else{lcd.print(" NF ");}

  // --- BLUE PHASE ---
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, LOW);
  digitalWrite(relay3, HIGH); // Turn Blue Relay ON
  delay(150);
  
  Serial.print("Blue ADC: ");
  data();
  lcd.setCursor(12,1);
  if(distance>0){lcd.print(distance); lcd.print("KM  ");}
  else{lcd.print(" NF ");}
}

void data(){
  read_ADC = analogRead(sensor);  
  Serial.println(read_ADC); // 2. Print the exact reading to the console!

  distance = read_ADC/100;

  if(distance>9)distance = 0;

  if(distance>0){
    digitalWrite(buzzer,HIGH);
    delay(100); // Shortened buzzer delay to prevent hanging
    digitalWrite(buzzer,LOW);  
  }
}