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

#define SCREEN_WIDTH 128  
#define SCREEN_HEIGHT 64
#define OLED_ADDR 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_ADDR);

const int pirPin = 2;
int pirState = LOW; 

void setup() {

  pinMode(pirPin, INPUT);
  
  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    for(;;);
  }
  
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
}

void loop() {

  int pirValue = digitalRead(pirPin);  

  if (pirValue == HIGH) {   
    if (pirState == LOW) {
      display.clearDisplay();
      display.setCursor(0, 0);
      display.println("Occupied");
      display.display();
      delay(500); 

      pirState = HIGH;
    }
  } 
  else {

  display.clearDisplay();
  display.setCursor(0,0);
  display.println("Free");
  display.display();
  delay(500); 

}
}