#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
#define BUTTON_PIN 14
#define LED_PIN 27
int button_state = 0;
void setup() {
  Serial.begin(115200);
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(30, 20);
  display.print(F("LED ON"));
  display.display();
  pinMode(LED_PIN, OUTPUT);
}
void loop() {
  button_state = digitalRead(BUTTON_PIN);
  if (button_state == 1) {
    digitalWrite(LED_PIN, HIGH);
    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(25, 20);
    display.print(F("LED ON"));
    display.display();
  } else {
    digitalWrite(LED_PIN, LOW);
    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(25, 20);
    display.print(F("LED OFF"));
    display.display();
  }
}