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

int screen_width = 128;
int screen_height = 64;
int reset = -1 ;
int address = 0x3C;
int leftbutton = 16;
int rightbutton = 18;
int x = 25; 
int y = 25; 
int k1, k2;
int flag = 0;
String stringMovement;

Adafruit_SSD1306 display(screen_width, screen_height, &Wire, reset);

void setup(){
  pinMode(leftbutton, INPUT_PULLDOWN);
  pinMode(rightbutton, INPUT_PULLDOWN);
  Serial.begin(9600);
  if (!display.begin(SSD1306_SWITCHCAPVCC,address)){
    Serial.println("display not connected");
    for(;;);
  }
  display.clearDisplay();
}

void loop(){
  if(flag==0){
    String s = Serial.readStringUntil('\n');
    if(s!=""){stringMovement = s; flag = 1;}
  }
  k1=digitalRead(16);
  if(k1 == 1 && x >= 3.5){
    x = x - 3.5;
  } 

  k2=digitalRead(18);
  if(k2 == 1){
    x = x + 3.5;
  }

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(x, y);

  display.print(stringMovement);
  display.display();
  delay(20); 
  display.clearDisplay();
}