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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define LED_PIN 13
#define POTENTIOMETER_PIN 34
#define ULTRASONIC_TRIGGER_PIN 2
#define ULTRASONIC_ECHO_PIN 25
#define PIR_PIN 4



void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(ULTRASONIC_TRIGGER_PIN, OUTPUT);
  pinMode(ULTRASONIC_ECHO_PIN, INPUT);
  
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Home Automation");
  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  int distance = getDistance();
  int pirState = digitalRead(PIR_PIN);
  int potValue = analogRead(POTENTIOMETER_PIN);
  
  if (pirState == HIGH || distance < 50) {
    digitalWrite(LED_PIN, HIGH);
    displayStatus("Active");
  } else {
    digitalWrite(LED_PIN, LOW);
    displayStatus("Inactive");
  }
  
  displaySensorReadings(distance, potValue);
  delay(500);
}

int getDistance() {
  digitalWrite(ULTRASONIC_TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(ULTRASONIC_TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(ULTRASONIC_TRIGGER_PIN, LOW);
  
  int duration = pulseIn(ULTRASONIC_ECHO_PIN, HIGH);
  int distance = duration * 0.034 / 2;
  return distance;
}

void displayStatus(String status) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Status: " + status);
  display.display();
}

void displaySensorReadings(int distance, int potValue) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Distance: " + String(distance) + " cm");
  display.println("Potentiometer: " + String(potValue));
  display.display();
}