#include <LiquidCrystal.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_WIDTH 128 // OLED display width,  in pixels
#define OLED_HEIGHT 64 // OLED display height, in pixels

// declare an SSD1306 display object connected to I2C
Adafruit_SSD1306 oled(OLED_WIDTH, OLED_HEIGHT, &Wire, -1);

int buzzer = 6;

const int buttonPin = 8;  
const int ledPin = 13;
int buttonState = 0;

const int buzzerPin = 9;

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


void setup() {

  Serial.begin(9600);

  pinMode(ledPin, OUTPUT);

  pinMode(buttonPin, INPUT);

  pinMode(buzzer, OUTPUT);

  lcd.begin(16, 2);

  lcd.print("Button state");

  // initialize OLED display with address 0x3C for 128x64
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
  Serial.println(F("SSD1306 allocation failed"));
  while (true);
  }

  delay(1000);         // wait for initializing
  oled.clearDisplay(); // clear display

  oled.setTextSize(1);          // text size
  oled.setTextColor(WHITE);     // text color
  oled.setCursor(0, 1);        // position to display
  oled.println("Button state"); // text to display
  oled.display();

}

void loop() {

  lcd.setCursor(0, 1);

  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) {

    digitalWrite(ledPin, HIGH);
    lcd.print("ON ");

    tone(buzzer, 10000);

    oled.clearDisplay();
    oled.setCursor(0, 1);        
    oled.println("Button state");
    oled.setCursor(0, 15);
    oled.println(("ON "));
    oled.display();

  } else if (buttonState == LOW) {

    digitalWrite(ledPin, LOW);
    lcd.print("OFF");
    noTone(buzzer);

    oled.setCursor(0, 15);
    oled.clearDisplay();
    oled.setCursor(0, 1);        
    oled.println("Button state");
    oled.setCursor(0, 15);
    oled.println(("OFF"));
    oled.display();
  }

}