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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.setCursor(0,0);
  Serial.println("Enter Passcode : ");
  display.println("Enter passcode:");
  display.display();

    while (Serial.available() == 0){}
    String input = Serial.readString();
    input.trim(); //removes blankspaces, otherwise it wont recognize it

    Serial.println(input);

    if (input == "123"){
      Serial.println("Authentication Complete");
      display.println("Authentication"); 
      display.println("Complete");
      display.display();
      delay(2000);
      exit(0);
    } else {
      Serial.println("Incorrect, try again");
      display.println("Incorrect, try again");

    }
    display.display();
    delay(2000);
    display.clearDisplay();
}