#include <DHT.h>       // Include DHT sensor library
#include <DHT_U.h>     // Include Adafruit Unified Sensor library (DHT dependency)

// --- Define Pins ---
#define LIGHT_LED_PIN    PB14  // Green LED for light control connected to PB14
#define MOTOR_RELAY_PIN  PB15  // Relay for motor/fan control connected to PB15
#define DHT22_DATA_PIN   PA1   // DHT22 data pin connected to PA1
#define LDR_ANALOG_PIN   PA0   // LDR module Analog Output connected to PA0

// --- Sensor Type & Thresholds ---
#define DHTTYPE DHT22 // Define sensor type (DHT11, DHT21, DHT22)

// Set your desired thresholds
const int LIGHT_THRESHOLD = 500; // Analog value (0-1023). Adjust based on your LDR and ambient light. Lower value = darker.
const float TEMPERATURE_THRESHOLD = 28.0; // Celsius. Adjust as needed. (28.0 C is approx 82.4 F)

// --- Initialize Sensors ---
DHT dht(DHT22_DATA_PIN, DHTTYPE);

void setup() {
  // Initialize Serial Communication for debugging
  Serial.begin(115200); // Higher baud rate for faster output
  while (!Serial);       // Wait for Serial port to connect (only for some boards/debuggers)
  Serial.println("STM32 Automated System Starting...");

  // Set LED pin as OUTPUT
  pinMode(LIGHT_LED_PIN, OUTPUT);
  digitalWrite(LIGHT_LED_PIN, LOW); // Ensure LED is off initially

  // Set Motor Relay pin as OUTPUT
  pinMode(MOTOR_RELAY_PIN, OUTPUT);
  digitalWrite(MOTOR_RELAY_PIN, LOW); // Ensure motor/relay is off initially (or whatever your module's "off" state is)

  // Start DHT sensor
  dht.begin();
  Serial.println("DHT22 Sensor initialized.");
  Serial.println("LDR Sensor initialized."); // LDR uses analogRead, no explicit begin
}

void loop() {
  // --- Read Light Intensity (LDR) ---
  int lightIntensity = analogRead(LDR_ANALOG_PIN);
  Serial.print("Light Intensity (LDR): ");
  Serial.println(lightIntensity);

  // Decision for Light Intensity
  if (lightIntensity < LIGHT_THRESHOLD) {
    // It's dark, turn on LED
    digitalWrite(LIGHT_LED_PIN, HIGH);
    Serial.println("    --> Light below threshold. Light LED (PB14) ON.");
  } else {
    // It's bright enough, turn off LED
    digitalWrite(LIGHT_LED_PIN, LOW);
    Serial.println("    --> Light above threshold. Light LED (PB14) OFF.");
  }

  // --- Read Temperature (DHT22) ---
  // Read temperature as Celsius (float)
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again next loop)
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" *C");

    // Decision for Temperature
    if (temperature > TEMPERATURE_THRESHOLD) {
      // Temperature is too high, turn on Motor/Relay
      digitalWrite(MOTOR_RELAY_PIN, HIGH); // Assuming HIGH activates your relay
      Serial.println("    --> Temperature above threshold. Motor/Fan (PB15) ON.");
    } else {
      // Temperature is okay, turn off Motor/Relay
      digitalWrite(MOTOR_RELAY_PIN, LOW); // Assuming LOW deactivates your relay
      Serial.println("    --> Temperature below threshold. Motor/Fan (PB15) OFF.");
    }
  }

  // Add a small delay before the next loop iteration
  // This is important for sensor stability and not to overwhelm the serial monitor.
  delay(2000); // Wait for 2 seconds
}