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

// Pin Definitions
#define PIR_SENSOR 15
#define RELAY_LED 13   // LED simulating relay
#define MOTOR_LED 18   // LED simulating stepper motor
#define LED_PIN 5      // Status LED
#define DHT_PIN 4      // DHT22 Sensor pin

// DHT22 Sensor Setup
#define DHT_TYPE DHT22
DHT dht(DHT_PIN, DHT_TYPE);

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

bool previousMotionState = false;

void setup() {
    Serial.begin(115200);

    // Pin Modes
    pinMode(PIR_SENSOR, INPUT);
    pinMode(RELAY_LED, OUTPUT);
    pinMode(MOTOR_LED, OUTPUT);
    pinMode(LED_PIN, OUTPUT);

    // Initialize DHT22
    dht.begin();

    // Initialize OLED Display
    if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
        Serial.println("SSD1306 allocation failed");
        for (;;);
    }
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 10);
    display.println("Industrial Auto");
    display.display();
    delay(2000);
}

void loop() {
    int motionDetected = digitalRead(PIR_SENSOR);
    float temperature = dht.readTemperature(); // Read temperature in Celsius

    if (motionDetected && !previousMotionState) {
        Serial.println("Motion Detected!");
        digitalWrite(RELAY_LED, HIGH);  // Simulating relay activation
        digitalWrite(MOTOR_LED, HIGH);  // Simulating stepper motor
        digitalWrite(LED_PIN, HIGH);    // Turn ON Status LED

        display.clearDisplay();
        display.setCursor(0, 0);
        display.println("Machine: ON");
        display.setCursor(0, 10);
        display.print("Temp: ");
        display.print(temperature);
        display.print(" C");
        display.display();

        previousMotionState = true;
    } else if (!motionDetected && previousMotionState) {
        Serial.println("No Motion.");
        digitalWrite(RELAY_LED, LOW);  // Simulating relay OFF
        digitalWrite(MOTOR_LED, LOW);  // Simulating stepper motor OFF
        digitalWrite(LED_PIN, LOW);    // Turn OFF Status LED

        display.clearDisplay();
        display.setCursor(0, 0);
        display.println("Machine: OFF");
        display.setCursor(0, 10);
        display.print("Temp: ");
        display.print(temperature);
        display.print(" C");
        display.display();

        previousMotionState = false;
    }

    delay(1000);
}