#include <DHT.h>
#include <SevSeg.h>

#define DHTPIN 4        // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE);

#define LED_PIN 2       // Digital pin connected to the LED
#define BUZZER_PIN 5    // Digital pin connected to the buzzer
#define TEMP_THRESHOLD 25 // Temperature threshold

// Pins for the seven-segment display
#define SEGMENT_A 10
#define SEGMENT_B 11
#define SEGMENT_C 12
#define SEGMENT_D 13
#define SEGMENT_E 14
#define SEGMENT_F 15
#define SEGMENT_G 16
#define SEGMENT_DP 17

SevSeg sevseg;

void setup() 
{
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  Serial.begin(9600);
  dht.begin();

  byte numDigits = 4;
  byte digitPins[] = {6, 7, 8, 9}; // Pins for controlling digits
  byte segmentPins[] = {SEGMENT_A, SEGMENT_B, SEGMENT_C, SEGMENT_D, SEGMENT_E, SEGMENT_F, SEGMENT_G, SEGMENT_DP}; // Pins for controlling segments
  sevseg.begin(COMMON_CATHODE, numDigits, digitPins, segmentPins);
}

void loop() 
{
  // Reading temperature takes about 250 milliseconds!
  float temperature = dht.readTemperature();

  if (isnan(temperature)) 
  {
    Serial.println("Failed to read from DHT sensor !!");
    return;
  }

  if (temperature > TEMP_THRESHOLD) 
  {
    triggerAlarm(LED_PIN, BUZZER_PIN);  // Trigger LED and buzzer alarm
    Serial.print("Temperature exceeded : ");
    Serial.println(temperature);
    displayTemperature(temperature);
  }
  delay(1000);  // Delay before next reading
}

void triggerAlarm(int pin, int otherPin) 
{
  // Trigger the alarm for consecutive 3 times
  tone(5 , 1500 , 1500) ;
  for (int i = 0; i < 3; i++) 
  {
    digitalWrite(pin, HIGH);    // Turn on buzzer or LED
    digitalWrite(otherPin, HIGH);  // Turn on LED or buzzer
    delay(500);                // Alarm duration
    digitalWrite(pin, LOW);     // Turn off buzzer or LED
    digitalWrite(otherPin, LOW);    // Turn off LED or buzzer
    delay(500);                // Delay before next alarm
  }
}

void displayTemperature(float temp) 
{
  int temp_int = (int)temp;
  sevseg.setNumber(temp_int);
  sevseg.refreshDisplay();
}