#include <LiquidCrystal_I2C.h>

// Initialize a LiquidCrystal object for the LCD display with the following pin connections:
// (RS, E, D4, D5, D6, D7)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define global variables and arrays
int gateInput1, gateInput2, i, j, k;
bool inputTable[4][2] = {0, 0, 0, 1, 1, 0, 1, 1};
int outputTable[5][4] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 6, 6, 6};
bool foundMatch, database[4][5] = {0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0};
String icName; // To store the IC name

void setup() {

  // Initialize the LCD display with 16 columns and 2 rows
  lcd.init(); //initialize the lcd
  lcd.backlight(); //open the backlight 


  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0);
  lcd.print("PUSH B TO TEST");
  lcd.setCursor(0, 1);
  lcd.print("B1 NOT B2 NOR");
  delay(1000);
  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0);
  lcd.print("B3 AND OR");
  lcd.setCursor(0, 1);
  lcd.print("NAND & EXOR");
  delay(1000);
  lcd.setCursor(0, 0);
  lcd.print("B4 INDUCTANCE");
  lcd.setCursor(0, 1);
  lcd.print("B5 CAPACITANCE");
  delay(1000);

  Serial.begin(9600); // Initialize the serial communication
  
}

void loop() {

  pinMode(6, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);

//MODE I NOT

if(digitalRead(6)==LOW)
  {
    lcd.clear();
    
    pinMode(2, INPUT);
    pinMode(3, OUTPUT);
    pinMode(1, OUTPUT);
    pinMode(0, INPUT);
    pinMode(21, OUTPUT);
    pinMode(20, INPUT);
    pinMode(17, INPUT);
    pinMode(16, OUTPUT);
    pinMode(18, INPUT);
    pinMode(19, OUTPUT);
    pinMode(26, INPUT);
    pinMode(22, OUTPUT);

    digitalWrite(3, LOW);
    digitalWrite(1, LOW);
    digitalWrite(21, LOW);
    digitalWrite(16, LOW);
    digitalWrite(19, LOW);
    digitalWrite(22, LOW);

    if(digitalRead(2)== HIGH)
    {
      lcd.setCursor(0,0);
      lcd.print("1.NOT");
      delay(100);
    }
    else
    {
      lcd.setCursor(0,0);
      lcd.print("1.BAD");
      delay(100);
    }
    if(digitalRead(0)== HIGH)
    {
      lcd.setCursor(5,0);
      lcd.print("2.NOT");
      delay(100);
    }
    else
    {
      lcd.setCursor(5,0);
      lcd.print("2.BAD");
      delay(100);
    }
    if(digitalRead(20)== HIGH)
    {
      lcd.setCursor(10,0);
      lcd.print("3.NOT");
      delay(100);
    }
    else
    {
      lcd.setCursor(10,0);
      lcd.print("3.BAD");
      delay(100);
    }
    if(digitalRead(17)== HIGH)
    {
      lcd.setCursor(0,1);
      lcd.print("4.NOT");
      delay(100);
    }
    else
    {
      lcd.setCursor(0,1);
      lcd.print("4.BAD");
      delay(100);
    }
    if(digitalRead(18)== HIGH)
    {
      lcd.setCursor(5,1);
      lcd.print("5.NOT");
      delay(100);
    }
    else
    {
      lcd.setCursor(5,1);
      lcd.print("5.BAD");
      delay(100);
    }
    if(digitalRead(26)== HIGH)
    {
      lcd.setCursor(10,1);
      lcd.print("6.NOT");
      delay(100);
    }
    else
    {
      lcd.setCursor(10,1);
      lcd.print("6.BAD");
      delay(100);
    }
    delay(1000);
  }


//MODE II NOR

  else if(digitalRead(7) == LOW)
  {
  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0);

  // Configure various pins as input and output
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(20, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(22, OUTPUT);
  pinMode(0, OUTPUT);
  pinMode(3, INPUT);
  pinMode(18, INPUT);
  pinMode(21, INPUT);
  pinMode(26, INPUT);

  for (i = 0; i < 4; i++) {
    outputTable[4][i] = 6; // Initialize the outputTable's fifth row with 6
  }

  for (i = 0; i < 4; i++) {
    // Testing gate 1
    digitalWrite(2, inputTable[i][0]);
    digitalWrite(1, inputTable[i][1]);
    gateInput1 = digitalRead(3);
    outputTable[i][0] = gateInput1;

    // Testing gate 2
    digitalWrite(22, inputTable[i][0]);
    digitalWrite(0, inputTable[i][1]);
    gateInput2 = digitalRead(26);
    outputTable[i][1] = gateInput2;

    // Testing gate 3
    digitalWrite(20, inputTable[i][0]);
    digitalWrite(19, inputTable[i][1]);
    gateInput1 = digitalRead(21);
    outputTable[i][2] = gateInput1;

    // Testing gate 4
    digitalWrite(17, inputTable[i][0]);
    digitalWrite(16, inputTable[i][1]);
    gateInput2 = digitalRead(18);
    outputTable[i][3] = gateInput2;
  }

  for (k = 0; k < 4; k++) {
    for (i = 0; i < 5; i++) {
      foundMatch = true;
      for (j = 0; j < 4; j++) {
        // Compare outputTable values with the database
        if (outputTable[j][k] != database[j][i]) {
          foundMatch = false;
          break;
        }
      }
      if (foundMatch) {
        outputTable[4][k] = i; // Store the matching result in the fifth row
      }
    }
  }

 for (i = 0; i < 4; i++) {
    lcd.setCursor((i % 2) * 7, i / 2); // Set the LCD cursor position
    lcd.print(i + 1); // Print gate number
    lcd.print('.'); // Add a period to separate the gate number and IC name
    switch (outputTable[4][i]) {
      case 0:
        icName = "AND";
        break;
      case 1:
        icName = "OR";
        break;
      case 2:
        icName = "NAND";
        break;
      case 3:
        icName = "NOR";
        break;
      case 4:
        icName = "EXOR";
        break;
      default:
        icName = "BAD";
        break;
    }
    lcd.print(icName + " ");
    delay(100);
}

  delay(1000);
  // Check if all IC names are the same
  bool allICsSame = true;
  for (i = 1; i < 4; i++) {
    if (outputTable[4][i] != outputTable[4][0]) {
      allICsSame = false;
      break;
    }
  }

  // Display a message based on whether all IC names are the same or not
  if (allICsSame) { //Showing the IC models
    if(icName=="AND"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("WRONG MODE");
    lcd.setCursor(0,1);
    lcd.print("PRESS BUTTON 3");
    } else if(icName=="OR"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("WRONG MODE");
    lcd.setCursor(0,1);
    lcd.print("PRESS BUTTON 3");
    } else if(icName=="NAND"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("WRONG MODE");
    lcd.setCursor(0,1);
    lcd.print("PRESS BUTTON 3");
    } else if(icName=="EXOR"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("WRONG MODE");
    lcd.setCursor(0,1);
    lcd.print("PRESS BUTTON 3");
    } else if(icName=="NOR"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("IC 7402");
    lcd.setCursor(0,1);
    lcd.print("ALL GATES ARE OK");
    }else if(icName=="BAD"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("BAD IC OR NO");
    lcd.setCursor(0, 1); // Set cursor to the second line
    lcd.print("IC IS CONNECTED");
    
    }
    
  } else {
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("ALL GATES ARE");
    lcd.setCursor(0, 1);
    lcd.print("NOT FUNCTIONAL");
  }

  delay(1000); // Delay for 1 second before repeating the loop
  }

  //MODE III OR AND NAND XOR

  else if(digitalRead(8) == LOW)
  {

  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0);

  // Configure various pins as input and output
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(20, OUTPUT);
  pinMode(21, OUTPUT);
  pinMode(22, OUTPUT);
  pinMode(26, OUTPUT);
  pinMode(1, INPUT);
  pinMode(16, INPUT);
  pinMode(19, INPUT);
  pinMode(0, INPUT);

  for (i = 0; i < 4; i++) {
    outputTable[4][i] = 6; // Initialize the outputTable's fifth row with 6
  }

  for (i = 0; i < 4; i++) {
    // Testing gate 1
    digitalWrite(2, inputTable[i][0]);
    digitalWrite(3, inputTable[i][1]);
    gateInput1 = digitalRead(1);
    outputTable[i][0] = gateInput1;

    // Testing gate 2
    digitalWrite(22, inputTable[i][0]);
    digitalWrite(26, inputTable[i][1]);
    gateInput2 = digitalRead(0);
    outputTable[i][1] = gateInput2;

    // Testing gate 3
    digitalWrite(20, inputTable[i][0]);
    digitalWrite(21, inputTable[i][1]);
    gateInput1 = digitalRead(19);
    outputTable[i][2] = gateInput1;

    // Testing gate 4
    digitalWrite(17, inputTable[i][0]);
    digitalWrite(18, inputTable[i][1]);
    gateInput2 = digitalRead(16);
    outputTable[i][3] = gateInput2;
  }

  for (k = 0; k < 4; k++) {
    for (i = 0; i < 5; i++) {
      foundMatch = true;
      for (j = 0; j < 4; j++) {
        // Compare outputTable values with the database
        if (outputTable[j][k] != database[j][i]) {
          foundMatch = false;
          break;
        }
      }
      if (foundMatch) {
        outputTable[4][k] = i; // Store the matching result in the fifth row
      }
    }
  }

 for (i = 0; i < 4; i++) {
    lcd.setCursor((i % 2) * 7, i / 2); // Set the LCD cursor position
    lcd.print(i + 1); // Print gate number
    lcd.print('.'); // Add a period to separate the gate number and IC name
    switch (outputTable[4][i]) {
      case 0:
        icName = "AND";
        break;
      case 1:
        icName = "OR";
        break;
      case 2:
        icName = "NAND";
        break;
      case 3:
        icName = "NOR";
        break;
      case 4:
        icName = "EXOR";
        break;
      default:
        icName = "BAD";
        break;
    }
    lcd.print(icName + " ");
    delay(100);
}

  delay(1000);
  // Check if all IC names are the same
  bool allICsSame = true;
  for (i = 1; i < 4; i++) {
    if (outputTable[4][i] != outputTable[4][0]) {
      allICsSame = false;
      break;
    }
  }

  // Display a message based on whether all IC names are the same or not
  if (allICsSame) { //Showing the IC models
    if(icName=="AND"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("IC 7408");
    lcd.setCursor(0,1);
    lcd.print("ALL GATES ARE OK");
    } else if(icName=="OR"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("IC 7432");
    lcd.setCursor(0,1);
    lcd.print("ALL GATES ARE OK");
    } else if(icName=="NAND"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("IC 7400");
    lcd.setCursor(0,1);
    lcd.print("ALL GATES ARE OK");
    } else if(icName=="EXOR"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("IC 7486");
    lcd.setCursor(0,1);
    lcd.print("ALL GATES ARE OK");
    } else if(icName=="NOR"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("BAD IC OR NO");
    lcd.setCursor(0,1);
    lcd.print("IC IS CONNECTED");
    }else if(icName=="BAD"){
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("BAD IC OR NO");
    lcd.setCursor(0, 1); // Set cursor to the second line
    lcd.print("IC IS CONNECTED");
    
    }
    
  } else {
    lcd.setCursor(0, 0); // Set cursor to the second line
    lcd.clear();
    lcd.print("ALL GATES ARE");
    lcd.setCursor(0, 1);
    lcd.print("NOT FUNCTIONAL");
  }

  delay(1000); // Delay for 1 second before repeating the loop
  }

  else
  {
  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0);
  lcd.print("PUSH B TO TEST");
  lcd.setCursor(0, 1);
  lcd.print("B1 NOT B2 NOR");
  delay(1000);
  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0);
  lcd.print("B3 AND OR");
  lcd.setCursor(0, 1);
  lcd.print("NAND & EXOR");
  delay(1000);
  
  }

}