#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pin Definitions
const int btn = 8;
const int ss1 = 2;
const int ss2 = 4;
const int led = 9;

int ss1state = 0; 
int ss2state = 0; 
int outputY = 0;
int bstate= 0;
int lbstate= LOW;
bool gateisand = false;
bool gatechanged = false;

void setup() {
  // Initialize pins
  pinMode(btn, INPUT);
  pinMode(ss1, INPUT_PULLUP);
  pinMode(ss2, INPUT_PULLUP);
  pinMode(led, OUTPUT);


  lcd.init();
  lcd.backlight();

  // Initial display
  lcd.setCursor(0, 0);
  lcd.print("OR GATE");
}

void loop() {
  ss1state = !digitalRead(ss1); 
  ss2state = !digitalRead(ss2); 

  bstate= digitalRead(btn);

  if (bstate== HIGH && lbstate== LOW) {
    gateisand = !gateisand;  
    gatechanged = true;    
    delay(200);            
  }

  lbstate= bstate; 

  if (gatechanged) {
    lcd.clear();
    if (gateisand) {
      lcd.setCursor(0, 0);
      lcd.print("AND GATE");
    } else {
      lcd.setCursor(0, 0);
      lcd.print("OR GATE");
    }
    gatechanged = false;
  }

  if (gateisand) {
    outputY = ss1state && ss2state;
  } else {
    outputY = ss1state || ss2state;
  }

  if (outputY == 1) {
    digitalWrite(led, HIGH); 
  } else {
    digitalWrite(led, LOW);
  }

  delay(100);
}