#include <DHT.h>
#include <LedControl.h>

// DHT22 configuration
#define DHTPIN 7
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// MAX7219 configuration
#define DIN_PIN 8
#define CS_PIN 9
#define CLK_PIN 10
LedControl lc = LedControl(DIN_PIN, CLK_PIN, CS_PIN, 1);

// Temperature thresholds
const float TEMP_MIN = 22.0;
const float TEMP_MAX = 30.0;

// Happy face pattern (8x8)
byte happyFace[8] = {
  B00000000,  
  B01000010,  
  B10100101,  
  B00000000,
  B00111100,
  B00100100,
  B00011000,
  B00000000
};

// Sad face pattern (8x8)
byte sadFace[8] = {
  B00000000,  //   ..####..
  B00000000,  //   .#....#.
  B11100111,  //   #.#..#.#
  B01000010,  //   #......#
  B00011000,  //   #..##..#
  B00100100,  //   #.#..#.#
  B00100100,  //   .#....#.
  B00000000   //   ..####..
};

void setup() {
  Serial.begin(9600);
  Serial.println("DHT22 Temperature Monitor with LED Matrix");
  
  // Initialize DHT22 sensor
  dht.begin();
  
  // Initialize MAX7219
  lc.shutdown(0, false);      // Wake up display
  lc.setIntensity(0, 8);      // Set brightness (0-15)
  lc.clearDisplay(0);         // Clear display
  
  delay(1000); // Wait for sensor to stabilize
}

void loop() {
  // Read temperature from DHT22
  float temperature = dht.readTemperature();
  
  // Check if reading was successful
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
  }
  
  // Print temperature to serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  
  // Determine which face to display
  if (temperature >= TEMP_MIN && temperature <= TEMP_MAX) {
    displayHappyFace();
    Serial.println("Status: HAPPY - Temperature in range");
  } else {
    displaySadFace();
    if (temperature < TEMP_MIN) {
      Serial.println("Status: SAD - Too cold!");
    } else {
      Serial.println("Status: SAD - Too hot!");
    }
  }
  
  delay(2000); // Update every 2 seconds
}

void displayHappyFace() {
  for (int row = 0; row < 8; row++) {
    lc.setRow(0, row, happyFace[row]);
  }
}

void displaySadFace() {
  for (int row = 0; row < 8; row++) {
    lc.setRow(0, row, sadFace[row]);
  }
}