#include "U8glib.h" //βιβλιοθήκη OLED οθόνης
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_RESET -1 
#define SCREEN_ADDRESS 0x3C
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

int ledPin = 4;
int BuzzerPin = 5;

Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
 pinMode(ledPin, OUTPUT);
 pinMode(BuzzerPin, OUTPUT);
 oled.setTextSize(1);         // set text size
 oled.setTextColor(WHITE);    // set text color
 oled.setCursor(30, 20);       // set position to display
 oled.println("Hello World"); // set text
 oled.display();              // display on OLED
 delay(3000);         // wait two seconds for initializing
 oled.clearDisplay(); // clear display
}

void loop() {
  // put your main code here, to run repeatedly:
 tone(BuzzerPin, 1000); // Send 1KHz sound signal...
 digitalWrite(ledPin, HIGH);
 delay(1000);        // ...for 1 sec
 digitalWrite(ledPin, LOW);
 noTone(BuzzerPin);     // Stop sound...
 delay(1000);        // ...for 1sec
}