// by Hui Lian
// 2 Digit Seven-Segment LED Display ScoreBoard with Buttons
//Team A's score on the Left digit, Team B's score on the Right digit, up to 19,dots on top left hand side are 10's
//Button1:Team A +/-1, Button2:Team B +/-1,Button3:Clear both when pressed long enough greater than set time,BTN3DownTime
//Button4: combined with button1 & 2, pressed -1, not pressed +1
// Common Anode digit 1 pin 3,8
// Common Anode digit 2 pin 3,8

//   G F  C1 A B    G F  C2 A B
//   | |  |  | |    | |  |  | |      -> pins and segments they control
//   -----------    -----------
//   |    A    |    |    A    |
//  F|         |B  F|         |B
//   |----G----|    |----G----|
//  E|         |C  E|         |C
//   |    D    |    |    D    |
//   -----------#DP -----------#DP
//   | |  |  | |    | |  |  | |      -> pins and segments they control
//   E D  C1 C DP   E D  C2 C DP      

// Segments that make each number when lit:
// 0 => -FEDCBA
// 1 => ----BC-
// 2 => G-ED-BA
// 3 => G--DCBA
// 4 => GF--CB-
// 5 => GF-DC-A
// 6 => GFEDC-A
// 7 => ----CBA
// 8 => GFEDCBA
// 9 => GF-DCBA

// Arduino digital pins used to light up
// corresponding segments on the LED display
#define A 2
#define B 3
#define C 4
#define D 5
#define E 6
#define F 7
#define G 8
#define DP 9

// Pushbuttons connected to pins A0,A1,A2 & A3
//BTN1:Left digit +1,BTN2:Right digit +1,BTN3:Clear both digits,BTN4:when being held down to decremet by 1 with
//BTN1 for left digit and BTN2 for right digit BTN1 for left digit
#define BTN1 A0
#define BTN2 A1
#define BTN3 A2
#define BTN4 A3

// Pins driving common anodes
#define CA1 10
#define CA2 11

// Pins for A B C D E F G,DP in sequence
const int segs[8] = { A, B, C, D, E, F, G,DP};

// Segments that make each number & letter:0,1,2,3,4,5,6,7,8,9,A,b,t in the format of [0b DP G F E D C B A] for each number
const byte numbers[13] = { 0b11000000, 0b11111001, 0b10100100, 0b10110000, 0b10011001, 0b10010010,
0b10000010, 0b11111000, 0b10000000, 0b10010000,0b10001000,0b10000011,0b10000111 };

int digit1 = 0;
int digit1low=0;
int digit2 = 0;
int digit2low=0;
int LastBTN1State=0;
int LastBTN2State=0;
int LastBTN3State=0;
int BTN1State=0;
int BTN2State=0;
int BTN3State=0;
int BTN4State=0;
unsigned long BTN3StartTime =0;
//unsigned long BTN3EndTime =0;
const int BTN3DownTime=900;

void setup() {
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(DP, OUTPUT);
  pinMode(BTN1, INPUT);
  pinMode(BTN2, INPUT);
  pinMode(BTN3, INPUT);
  pinMode(BTN4, INPUT);
  pinMode(CA1, OUTPUT);
  pinMode(CA2, OUTPUT);
//Display "A" for team A on the Left digit (digit1)
//Display "B" for team B on the right digit (digit2)
//twice to inform teams,players...etc
  lightDigit1(numbers[10]);
  delay(2000);
  lightDigit2(numbers[11]);
  delay(2000);

  lightDigit1(numbers[10]);
  delay(2000);
  lightDigit2(numbers[11]);
  delay(2000);
}

void loop() {
  // check button4, as button4 will decide to +1 or -1 the score
  BTN4State = digitalRead(BTN4);
  // check button1 Team A, if there is a rising edge,change digit1:+1 if BTN4 not pressed,-1 if BTN4 pressed
  BTN1State = digitalRead(BTN1);
  if (BTN1State != LastBTN1State && BTN1State==HIGH) {
    if (BTN4State==LOW) {
      digit1++;
      digit1 %= 20;
      delay(1);
    }
    else {
      if (digit1>0){
        digit1=digit1-1;
        delay(1);
      }
    }
  }
  LastBTN1State=BTN1State;

  // check button2 Team B, if there is a rising edge,change digit2:+1 if BTN4 not pressed,-1 if BTN4 pressed
  BTN2State = digitalRead(BTN2);
  if (BTN2State != LastBTN2State && BTN2State==HIGH) {
    if (BTN4State==LOW) {
      digit2++;
      digit2 %= 20;
      delay(1);
    }
    else {
      if (digit2>0){
        digit2=digit2-1;
        delay(1);
      }
    }
  }
  LastBTN2State=BTN2State;

  // check button3
  //if there is a rising edge: set BTN3 start time, falling edge BTN3 end time
  //if the duration is greater than the set time, BTN3DownTime, Clear both digits when button3 released
  BTN3State = digitalRead(BTN3);
  if (BTN3State != LastBTN3State) {
    if (BTN3State==HIGH) {
      BTN3StartTime = millis();
//    BTN3EndTime = BTN3StartTime;
    }
    else {
//    BTN3EndTime = millis();
      }
    }
if (((millis()-BTN3StartTime)>BTN3DownTime) && BTN3State==HIGH) {
  digit1=0;
  digit2=0;
  BTN3StartTime=0;
//  BTN3EndTime=0;  
  delay(1);
}
  LastBTN3State=BTN3State;
  //Anti-Bouncing delay
  delay(20);

//Old program:clear both digits when button3 pressed
  // check button3
//  BTN3State = digitalRead(BTN3);
//  if (BTN3State == HIGH) {
//    digit1=0;
//    digit2=0;
//    delay(1);
//  }
  // display number
//  unsigned long startTime = millis();
//  for (unsigned long elapsed=0; elapsed < 600; elapsed = millis() - startTime) {}
    digit1low=digit1;
    if (digit1>9) {
      digit1low=digit1-10;
    }
    lightDigit1(numbers[digit1low]);
    delay(5);
      digit2low=digit2;
    if (digit2>9) {
      digit2low=digit2-10;
    }
    lightDigit2(numbers[digit2low]);
    delay(5);
//  }
}

void lightDigit1(byte number) {
  digitalWrite(CA1, LOW);
  digitalWrite(CA2, LOW);
  lightSegments(number);
  if (digit1>9) {
    digitalWrite(DP, LOW);
  }
  else {
    digitalWrite(DP, HIGH);
  }
  digitalWrite(CA1, HIGH);
}

void lightDigit2(byte number) {
  digitalWrite(CA1, LOW);
  digitalWrite(CA2, LOW);
  lightSegments(number);
  if (digit2>9) {
    digitalWrite(DP, LOW);
  }
  else {
    digitalWrite(DP, HIGH);
  }
  digitalWrite(CA2, HIGH);
}

void lightSegments(byte number) {
  for (int i = 0; i < 8; i++) {
    int bit = bitRead(number, i);
    digitalWrite(segs[i], bit);
  }
}