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

#define SCREEN_WIDTH 128 // OLED width,  in pixels
#define SCREEN_HEIGHT 64 // OLED height, in pixels

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

String input;

void setup() {
  Serial.begin(115200);
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
  delay(2000);         // wait two seconds for initializing
  oled.clearDisplay(); // clear display
}

void loop() {
  while (Serial.available()) {
    input = Serial.readString();
    Serial.println(input);
    OLED(input);
  }
  OLED("hello world");
  delay(1000);
}

void OLED(String display) {
  oled.clearDisplay(); // clear display
  oled.setTextSize(1);         // set text size
  oled.setTextColor(WHITE);    // set text color
  oled.setCursor(0, 2);       // set position to display (x,y)
  oled.println(display); // set text
  oled.display();
}