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

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

// Pins
int pirPin = 2;
int ledPin = 7;

// Variables
int motionCount = 0;
bool lastState = LOW;

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);

  Serial.begin(9600);

  // OLED init
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    while(true);
  }

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);

  display.setCursor(0, 0);
  display.print("System Ready");
  display.display();

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

void loop() {
  bool motion = digitalRead(pirPin);

  // Detect rising edge (LOW → HIGH)
  if (motion == HIGH && lastState == LOW) {
    motionCount++;  // Count only once per motion

    digitalWrite(ledPin, HIGH);

    // Display on OLED
    display.clearDisplay();
    display.setCursor(0, 0);
    display.print("Motion:");
    display.setCursor(0, 30);
    display.print(motionCount);
    display.display();

    delay(500); // small delay for stability
  }

  // Turn LED OFF when no motion
  if (motion == LOW) {
    digitalWrite(ledPin, LOW);
  }

  lastState = motion;
}