#include <Servo.h>

int sensor_state = 0;
int distance = 0;
int led = 13;                // the pin that the LED is atteched to
int pir = 8;              // the pin that the sensor is atteched to
int state = LOW;             // by default, no motion detected
int pir1 = 0;                 // variable to store the sensor status (value)
Servo servo_3;

const int ledPin=12;
const int sensorPin= A0;
int level;
const int threshold=800;

int temp = A1;
int greenLed = 11;
int redLed = 10 ;
int fan = 7;
int buzzer = 6;
int thresholdValue = 0;
int celsius = 0;
int fahrenheit = 0;
const float BETA = 3950;
void greenLightOff(){
digitalWrite(greenLed, LOW);
}
void greenLightOn(){
digitalWrite(greenLed, HIGH);
}
 void redLightOff(){
   digitalWrite(redLed, LOW);
 }
 void redLightOn(){
  digitalWrite(redLed, HIGH);
 }
 void fanOn(){
  digitalWrite(fan, HIGH);
 }
 void fanOff(){
  digitalWrite(fan, LOW);
 }
 void buzzerOn(){
digitalWrite(buzzer, HIGH);
 }
 void buzzerOff(){
  digitalWrite(buzzer, LOW);
 }


long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  return pulseIn(echoPin, HIGH);
}

void setup()
{
  pinMode(led, OUTPUT);       // initalize LED as an output
  pinMode(pir, INPUT);        // initialize sensor as an input
  Serial.begin(9600);         // initialize serial
  servo_3.attach(3, 500, 2500);
  pinMode(7, OUTPUT);
  pir1 = digitalRead(pir);     // read sensor value

pinMode (ledPin, OUTPUT);
pinMode (sensorPin, INPUT);
// Serial.begin(9600);
pinMode(redLed, OUTPUT);
   pinMode(greenLed, OUTPUT);
   pinMode(fan, OUTPUT);
   pinMode(buzzer, OUTPUT);
   pinMode(temp, INPUT);
  // Serial.begin(9600);


}

void loop()
{
  distance = 0.01723 * readUltrasonicDistance(5, 4);
  sensor_state = digitalRead(2);
  servo_3.write(0);
  // if sensor_data is high, rotate servo motor, else
  // close it.
  if (sensor_state == HIGH) {
    servo_3.write(45);
    servo_3.write(0);
    delay(1000); // Wait for 1000 millisecond(s)
    servo_3.write(0);
    tone(7, 123, 1000); // play tone 35 (B2 = 123 Hz)
  }
   
  if (distance <= 10) 
  {
    Serial.println("Gate Open");
    servo_3.write(80);
    delay(5000); // Wait for 4000 millisecond(s)
    Serial.println("Gate Close");
    servo_3.write(0);
    tone(7, 123, 1000); // play tone 35 (B2 = 123 Hz)
  } 
  else 
  {
    servo_3.write(0);
  }
  
   pir1 = digitalRead(pir);   // read sensor value
  if (pir1 == HIGH)            // check if the sensor is HIGH
  {         
    digitalWrite(led, HIGH);   // turn LED ON
    delay(500);                // delay 100 milliseconds 
    if (state == LOW) 
    {
      Serial.println("Motion detected!"); 
      state = HIGH;       // update variable state to HIGH
    }
  } 
  else {
      digitalWrite(led, LOW); // turn LED OFF
      delay(500);             // delay 200 milliseconds 
      
      if (state == HIGH){
        Serial.println("Motion stopped!");
        state = LOW;       // update variable state to LOW
    }
  }

level= analogRead(sensorPin);
if (level > threshold)
{

digitalWrite(ledPin, HIGH);
Serial.println("Its Dark, LED ON");
delay(1000);
Serial.flush();
// digitalWrite(ledPin, LOW);
}

else
{

digitalWrite(ledPin, LOW);
Serial.println("Its Light, LED OFF");
delay(1000);
Serial.flush();

}
 int analogValue = analogRead(A1);
  celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  fahrenheit = ((celsius * 9) / 5 + 32);
  
   Serial.print(celsius);
   Serial.print(" C : ");
  Serial.print(fahrenheit);
  Serial.println(" F");
  
  if( celsius<= 25){
     greenLightOn();
     redLightOff();
     fanOff();
     buzzerOff();
  Serial.println("green light on");
   }
   else if(celsius >= 25 && celsius <= 25){
     greenLightOff();
     fanOff();
     buzzerOff();
     redLightOn();
   Serial.println("red light on");
   }
   else if(celsius > 25){
  redLightOn();
     fanOn();
     buzzerOn();
     greenLightOff();
    
     Serial.println("Red Light On | Fan on");
   }
   else{
    Serial.println("Temperature is Normal");
   }
   delay(500);
}