const float BETA = 3950;
int d1pin = 9;
int d2pin = 10;
int echoPin = 11;
int trigPin = 12;

void zero() { digitalWrite(2,LOW); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,LOW); digitalWrite(6,LOW); digitalWrite(7,LOW); digitalWrite(8,HIGH); }
void one() { digitalWrite(2,HIGH); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,HIGH); digitalWrite(6,HIGH); digitalWrite(7,HIGH); digitalWrite(8,HIGH); }
void two() { digitalWrite(2,LOW); digitalWrite(3,LOW); digitalWrite(4,HIGH); digitalWrite(5,LOW); digitalWrite(6,LOW); digitalWrite(7,HIGH); digitalWrite(8,LOW); }
void three() { digitalWrite(2,LOW); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,LOW); digitalWrite(6,HIGH); digitalWrite(7,HIGH); digitalWrite(8,LOW); }
void four() { digitalWrite(2,HIGH); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,HIGH); digitalWrite(6,HIGH); digitalWrite(7,LOW); digitalWrite(8,LOW); }
void five() { digitalWrite(2,LOW); digitalWrite(3,HIGH); digitalWrite(4,LOW); digitalWrite(5,LOW); digitalWrite(6,HIGH); digitalWrite(7,LOW); digitalWrite(8,LOW); }
void six() { digitalWrite(2,LOW); digitalWrite(3,HIGH); digitalWrite(4,LOW); digitalWrite(5,LOW); digitalWrite(6,LOW); digitalWrite(7,LOW); digitalWrite(8,LOW); }
void seven() { digitalWrite(2,LOW); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,HIGH); digitalWrite(6,HIGH); digitalWrite(7,HIGH); digitalWrite(8,HIGH); }
void eight() { digitalWrite(2,LOW); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,LOW); digitalWrite(6,LOW); digitalWrite(7,LOW); digitalWrite(8,LOW); }
void nine() { digitalWrite(2,LOW); digitalWrite(3,LOW); digitalWrite(4,LOW); digitalWrite(5,LOW); digitalWrite(6,HIGH); digitalWrite(7,LOW); digitalWrite(8,LOW); }

int getDigit(int number, int position) {
  number = (number < 0) ? -number : number;
  int divisor = 1;
  for (int i = 0; i < position; ++i) {
      divisor *= 10;
  }
  int digit = (number / divisor) % 10;
  return digit;
}

typedef void (*DigitFunction)();
DigitFunction digitFunctions[] = {zero, one, two, three, four, five, six, seven, eight, nine};

void displayNumber(int number) {
  int digit1 = getDigit(number, 1);
  int digit2 = getDigit(number, 0);

  digitFunctions[digit1]();
  digitalWrite(d1pin, HIGH);
  digitalWrite(d2pin, LOW);
  delay(15);
  digitalWrite(d1pin, LOW);

  digitFunctions[digit2]();
  digitalWrite(d2pin, HIGH);
  delay(15);
  digitalWrite(d2pin, LOW);
}

void setup() {
  Serial.begin(9600);

  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(8,OUTPUT);

  pinMode(d1pin,OUTPUT);
  pinMode(d2pin,OUTPUT);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int analogValue = analogRead(A1);
  float volt = (analogValue/1023)* 5;
  float Temp = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  int duration = pulseIn(echoPin, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);

  // Serial.print("Temperature: ");
  // Serial.print(Temp);
  // Serial.println(" ℃");

  displayNumber((int)Temp);
  delay(150);

}