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


#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

String readString = "";

void setup() {
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  Serial.begin(9600);

  display.clearDisplay();
  display.display();
  display.setFont();
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(WHITE); // Draw white text
  display.setCursor(0, 20);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  display.println("This is a test.");
  display.display();
  
}

void loop() {
  if(Serial.available() > 0){
      readString = Serial.readString();
      display.clearDisplay();
      display.display();
      display.setCursor(0,0);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.println(readString);
      display.display();

  }

}