#define common_cathode 0 
#define common_anode 1 
#define pinA 6 
#define pinB 7 
#define pinC 8 
#define pinD 9 
#define pinE 10 
#define pinF 11 
#define pinG 12 
#define pinDP 13 
#define D1 2 
#define D2 3 
#define D3 4 
#define D4 5 
#define DP 30
#define Btn A1
String Nmbr="1234";
bool Type = common_anode;// Selet the display type

const int charsInArray = 37;
byte digits[]{D1,D2,D3,D4}; // defining the digit pins
byte seg[] {pinA,pinB,pinC,pinD,pinE,pinF,pinG,pinDP}; // defining the seven segment pins
byte Char[37][9] { 
            
            {1,1,1,1,1,1,0,0,'0'},//0
            {0,1,1,0,0,0,0,0,'1'},//1
            {1,1,0,1,1,0,1,0,'2'},//2
            {1,1,1,1,0,0,1,0,'3'},//3
            {0,1,1,0,0,1,1,0,'4'},//4
            {1,0,1,1,0,1,1,0,'5'},//5
            {1,0,1,1,1,1,1,0,'6'},//6
            {1,1,1,0,0,0,0,0,'7'},//7
            {1,1,1,1,1,1,1,0,'8'},//8
            {1,1,1,1,0,1,1,0,'9'}, //9
            {1,1,1,0,1,1,1,0,'a'},//A/1
            {0,0,1,1,1,1,1,0,'b'},//b/2
            {0,0,0,1,1,0,1,0,'c'},//C/3
            {0,1,1,1,1,0,1,0,'d'},//d/4
            {1,0,0,1,1,1,1,0,'e'},//E/5
            {1,0,0,0,1,1,1,0,'f'},//F/6
            {1,0,1,1,1,1,0,0,'g'},//G/7
            {0,1,1,0,1,1,1,0,'h'},//H/8
            {0,1,1,0,0,0,0,0,'i'},//I/9
            {0,1,1,1,1,0,0,0,'j'},//J/10
            {0,0,0,1,1,1,0,0,'l'},//L/11
            {0,0,1,0,1,0,1,0,'n'},//n/12
            {0,0,1,1,1,0,1,0,'o'},//o/13
            {1,1,0,0,1,1,1,0,'p'},//P/14
            {1,1,1,0,0,1,1,0,'q'},//q/15
            {0,0,0,0,1,0,1,0,'r'},//r/16
            {1,0,1,1,0,1,1,0,'s'},//S/17   
            {0,0,0,1,1,1,1,0,'t'},//t/18
            {0,1,1,1,1,1,0,0,'u'},//U/19
            {0,1,1,1,0,1,1,0,'y'},//y/20
            {0,0,0,0,0,0,0,1,'.'},//.
            {0,0,0,0,0,0,1,0,'-'},//dash/negative
            {0,0,0,1,0,0,0,0,'_'},//underscore
            {1,0,0,1,1,1,0,0,'['},//[
            {1,1,1,1,0,0,0,0,']'},//]
            {1,1,0,0,1,0,1,0,'?'},//?
            {0,0,0,0,0,0,0,0,' '}//blank
            
            };





void setup() {                 
  // initialize the I/O pins
  pinMode(pinA, OUTPUT);      
  pinMode(pinB, OUTPUT);      
  pinMode(pinC, OUTPUT);      
  pinMode(pinD, OUTPUT);      
  pinMode(pinE, OUTPUT);      
  pinMode(pinF, OUTPUT);      
  pinMode(pinG, OUTPUT);  
  pinMode(pinDP, OUTPUT);   
  pinMode(D1, OUTPUT);   
  pinMode(D2, OUTPUT);   
  pinMode(D3, OUTPUT);   
  pinMode(D4, OUTPUT);  
  pinMode(Btn, INPUT_PULLUP); 
  Serial.begin(9600); // Initialize the serial communication.
  Serial.println(" ");
} 


void loop() { 
  
print_number(Nmbr); //Print the number of seven segment display
Reset_Seven_Segment();// Reset the seven segment
} 



void print_number(String text)
{
char char1 = text.charAt(0);
char char2 = text.charAt(1);
char char3 = text.charAt(2);
char char4 = text.charAt(3);
//char char5 = text.charAt(4);
//char char1Num = 0;
//char char2Num = 0;
//char char3Num = 0;
//char char4Num = 0;
int nmbr_of_digits = text.length();

if(nmbr_of_digits < 6){
 
  while(digitalRead(Btn)==HIGH){

    if (Serial.available()>0)
    {
      Reset_Seven_Segment();
      Nmbr=Serial.readString();
      Serial.println((String)"Number Received "+Nmbr);
      }
  if(1 > nmbr_of_digits) char1 = ' ';
  else char1 = text.charAt(0);
  if(2 > nmbr_of_digits) char2 = ' ';
  else char2 = text.charAt(1);
  if(3 > nmbr_of_digits) char3 = ' ';
  else char3 = text.charAt(2);
  if(4 > nmbr_of_digits) char4 = ' ';
  else char4 = text.charAt(3);
  print_char(char1,D1);
  delay(2);
  print_char(char2,D2);
  delay(2);
  print_char(char3,D3);
  delay(2);
  print_char(char4,D4);
  delay(2);
  }
  Serial.println("Button Pressed");

}
}
  


void print_char(char ch,int digit_number)
{ Reset_Seven_Segment(); 
  int character = -1;
  digitalWrite(digit_number,Type);
  for(int i = 0 ; i < charsInArray ; i++){
    
    if(ch == Char[i][8]){
      character = i;
    }
  }
  if (character == -1){
    digitalWrite(pinG,!Type);
  }else{
for(int i = 0;i<= 7;i++)
    {if(Type == common_anode) digitalWrite(seg[i],!Char[character][i]);     
    else if(Type == common_cathode) digitalWrite(seg[i],Char[character][i]);
      
    }
  }
}

void Reset_Seven_Segment()
{ digitalWrite(D1, !Type);
  digitalWrite(D2, !Type);
  digitalWrite(D3, !Type);
  digitalWrite(D4, !Type); 
  for(byte i = 0 ; i < 8 ; i++){
  digitalWrite(seg[i],Type);
  }
}