/* Version - Date - Author - Descriptioin
*
*/

/*Using arrays for 7 segment display
  Segments:             Pins:
          a a a              2 2 2
        f       b          6       3
        f       b          6       3
        f       b          6       3
          g g g              8 8 8
        e       c          6       4
        e       c          6       4
        e       c          6       4
          d d d              5 5 5
*/

int incomingByte = 0;   // for incoming serial data

//                   a  b  c d  e  f  g
const byte pins[] = {2,3, 4, 5, 6, 7, 8};
const byte digits[] = {
  //gfedcba  *** FOR COMMON ANODE 7 SEGMENT DISPAY - REVERSE BITS & WIRING for COMMON CATHODE ***
  0b1000000,  // 0
  0b1111001,  // 1
  0b0100100,  // 2
  0b0110000,  // 3
  0b0011001,  // 4
  0b0010010,  // 5
  0b0000010,  // 6
  0b1111000,  // 7
  0b0000000,  // 8
  0b0011000,   // 9
  0b0001000,  // A
  0b0000011,   // b
  0b0110011,   // c
  0b0100001, //d
  0b0000110,   // E
  0b0001110
};

void displayNumber(byte number) {
  number = number -48;   // hold the number between 0 and 9
  byte d = digits[number];
  for (byte i = 0; i < sizeof(pins); i++) {    // size of pins is 7 for 7 segment display.
    digitalWrite(pins[i], bitRead(d, i));  // turn segments on or off
  }
 
}

void setup() 
{
  Serial.begin(9600);   /// set baud rate, also set serial monitor to no line ending right bottom of serial monitor
  Serial.println("Open Serial Monitor and check if anything in serial receve buffer:");
  for (byte j = 0; j < sizeof(pins); j++) {
    pinMode(pins[j], OUTPUT);
  }
}

void loop() 
{
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();

    // say what you got:
    Serial.write(incomingByte);
                
    if((incomingByte>47)& (incomingByte<58))  // get only numbers.     
    {
      displayNumber(incomingByte);       // display number in 7 segment
    }
  }
 
 delay(1000);
}