int x;
byte segment_vals[12] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,0x40,0x79}; 

//Function Prototypes
void set4x7seg(int val);
void set7seg(int val);
const int temp=A0; //A0 is the temp sensor input
float tempf; //Temp of Farenheit
float tempc; //Temp of Celcius
float val; //Sensor Reading
void setup() {
  pinMode(temp, INPUT); //A0 Input
  Serial.begin(9600);
  x = 9999;
  DDRK = 0xFF;
  PORTK = 0x00;
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);

  digitalWrite(8,HIGH);
  digitalWrite(9,HIGH);
  digitalWrite(10,HIGH);
  digitalWrite(11,HIGH);
}

void loop() {
  val = analogRead(temp);  // read the input pin
  tempc=(val*500)/1023; //Convert val Celcius
  tempf=(tempc*1.8)+32; //Convert val to Farenheit
  set4x7seg(tempc);
  //int adc_raw;
  //adc_raw = analogRead(A0);
  //Serial.println(adc_raw); 
}


void set4x7seg(int val){

  if (val>999 || val <-999){
    set7seg(11);
    //ACTIVATE DIGIT 1
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
  }

  else if (val < 0){

    if (val > -10) //single digit negative value scenario
    {

    set7seg(10);
    //ACTIVATE DIGIT 1
    digitalWrite(8,LOW);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);


    set4x7seg(-1*val);
    //ACTIVATE DIGIT 1
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);


    }

    else {
      set7seg(10);
    //ACTIVATE DIGIT 1
    digitalWrite(8,LOW);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);

    set4x7seg(val*-1);}
  } else if (val<10)
  {

    set7seg(val);
    //ACTIVATE DIGIT 1
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);


  } else if (val<100)
  {
    set7seg(val%10); //1's digit
    //ACTIVATE DIGIT 1
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    //delay(1);
  
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);

    set7seg(val/10); //10's digit
    //ACTIVATE DIGIT 2
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,LOW);
    digitalWrite(11,HIGH);
    //delay(1);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);



  }else if (val<1000)
  {
    set7seg(val%10); //1's digit
    //ACTIVATE DIGIT 1
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    //delay(1);
  
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    
    set7seg(val/10%10); //10's digit
    //ACTIVATE DIGIT 2
    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,LOW);
    digitalWrite(11,HIGH);
    //delay(1);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);

    set7seg(val/100); //10's digit
    //ACTIVATE DIGIT 3
    digitalWrite(8,HIGH);
    digitalWrite(9,LOW);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    //delay(1);

    digitalWrite(8,HIGH);
    digitalWrite(9,HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);


  }





}

void set7seg(int val){
  PORTK = segment_vals[val];
}