#define LED 2
const int trigPin = 14;
const int echoPin = 27;
const int temm = 15;
const int butt = 34;

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;

int analogValue;
float celsius;

void setup() {
  Serial.begin(9600); // Starts the serial communication
  analogReadResolution(10);
  pinMode(LED, OUTPUT);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  pinMode(temm, INPUT);
  pinMode(butt, INPUT);

  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
  delay(1000);
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
 
}
void UScheck(){
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  // Convert to inches
  //distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance in the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distanceCm);
  Serial.println(" cm");
  // Serial.print("Distance (inch): ");
  // Serial.println(distanceInch);
}
void tempcheck(){
  analogValue = analogRead(temm);
  celsius = 1 / (log(1 / (1023. / analogValue - 1)) / 3950 + 1.0 / 298.15) - 273.15;
  Serial.println(celsius);
}
void notify(){
  if(celsius >= 20){
    digitalWrite(LED, HIGH);
    delay(1000);
    digitalWrite(LED, LOW);
  }
  if(distanceCm >= 250){
    digitalWrite(LED, HIGH);
    delay(1000);
    digitalWrite(LED, LOW);
    delay(500);
    digitalWrite(LED, HIGH);
    delay(1000);
    digitalWrite(LED, LOW);
  }
  if(digitalRead(butt) == HIGH){
    digitalWrite(LED, HIGH);
    delay(5000);
    digitalWrite(LED, LOW);
  }
}
void loop() {
  UScheck();
  tempcheck();
  notify();
  delay(5000);
}