//BINARY TO NUMBERS SIMPLE ARDUINO UNO CONVERTER 0-9

/*Binary table 0-16 for beginners
  X3  X2  X1  X0
  0   0   0   0   =   0
  0   0   0   1   =   1
  0   0   1   0   =   2
  0   0   1   1   =   3
  0   1   0   0   =   4
  0   1   0   1   =   5
  0   1   1   0   =   6
  0   1   1   1   =   7
  1   0   0   0   =   8
  1   0   0   1   =   9
  1   0   1   0   =   10  (out of range for one 7 segment display)
  1   0   1   1   =   11  (out of range for one 7 segment display)
  1   1   0   0   =   12  (out of range for one 7 segment display)
  1   1   0   1   =   13  (out of range for one 7 segment display)
  1   1   1   0   =   14  (out of range for one 7 segment display)
  1   1   1   1   =   15  (out of range for one 7 segment display)
*/

/*Tutorial (How to set up arduino with 7 segment display)
    Pins 2-9 are display pins
    Pins 10-13 are data input pins
    Segment "A" (top middle)    is on pin number 2
    Segment "B" (top right)     is on pin number 3
    Segment "C" (bottom right)  is on pin number 4
    Segment "D" (bottom middle) is on pin number 5
    Segment "E" (bottom left)   is on pin number 6
    Segment "F" (top left)      is on pin number 7
    Segment "G" (middle)        is on pin number 8
    Segment "DP"(dot)           is on pin number 9
*/

//If your display doesn't work, switch from +5V to GND and swap HIGH/LOW (ON/OFF) properties

// to get 0 on data input pin connect it to ground (GND)
// to get 1 on data input pin connect it to +5V

//CODE:

//set delay time in ms
#define setdelay 250

//on/off properties for display
int ON  = LOW;
int OFF = HIGH;

//x0 x1 x2 x3
int X3 = 13;
int X2 = 12;
int X1 = 11;
int X0 = 10;

//set segments
int segmentA    = 2;
int segmentB    = 3;
int segmentC    = 4;
int segmentD    = 5;
int segmentE    = 6;
int segmentF    = 7;
int segmentG    = 8;
int segmentDP   = 9;

void setup() {
  //turn display OFF
  digitalWrite(segmentA,  OFF);
  digitalWrite(segmentB,  OFF);
  digitalWrite(segmentC,  OFF);
  digitalWrite(segmentD,  OFF);
  digitalWrite(segmentE,  OFF);
  digitalWrite(segmentF,  OFF);
  digitalWrite(segmentG,  OFF);
  digitalWrite(segmentDP, OFF);

  //set pin modes display
  pinMode(segmentA,   OUTPUT);
  pinMode(segmentB,   OUTPUT);
  pinMode(segmentC,   OUTPUT);
  pinMode(segmentD,   OUTPUT);
  pinMode(segmentE,   OUTPUT);
  pinMode(segmentF,   OUTPUT);
  pinMode(segmentG,   OUTPUT);
  pinMode(segmentDP,  OUTPUT);

  //set pin modes X3, X2, X1, X0
  pinMode(X3, INPUT);
  pinMode(X2, INPUT);
  pinMode(X1, INPUT);
  pinMode(X0, INPUT);
  
  //does the display work?
  segmentTest();
}

void loop() {
  //0000 = 0
  if (digitalRead(X3) == LOW && digitalRead(X2) == LOW && digitalRead(X1) == LOW && digitalRead(X0) == LOW) {
    zero();
  }
  //0001 = 1
  if (digitalRead(X3) == LOW && digitalRead(X2) == LOW && digitalRead(X1) == LOW && digitalRead(X0) == HIGH) {
    one();
  }
  //0010 = 2
  if (digitalRead(X3) == LOW && digitalRead(X2) == LOW && digitalRead(X1) == HIGH && digitalRead(X0) == LOW) {
    two();
  }
  //0011 = 3
  if (digitalRead(X3) == LOW && digitalRead(X2) == LOW && digitalRead(X1) == HIGH && digitalRead(X0) == HIGH) {
    three();
  }
  //0100 = 4
  if (digitalRead(X3) == LOW && digitalRead(X2) == HIGH && digitalRead(X1) == LOW && digitalRead(X0) == LOW) {
    four();
  }
  //0101 = 5
  if (digitalRead(X3) == LOW && digitalRead(X2) == HIGH && digitalRead(X1) == LOW && digitalRead(X0) == HIGH) {
    five();
  }
  //0110 = 6
  if (digitalRead(X3) == LOW && digitalRead(X2) == HIGH && digitalRead(X1) == HIGH && digitalRead(X0) == LOW) {
    six();
  }
  //0111 = 7
  if (digitalRead(X3) == LOW && digitalRead(X2) == HIGH && digitalRead(X1) == HIGH && digitalRead(X0) == HIGH) {
    seven();
  }
  //1000 = 8
  if (digitalRead(X3) == HIGH && digitalRead(X2) == LOW && digitalRead(X1) == LOW && digitalRead(X0) == LOW) {
    eight();
  }
  //1001 = 9
  if (digitalRead(X3) == HIGH && digitalRead(X2) == LOW && digitalRead(X1) == LOW && digitalRead(X0) == HIGH) {
    nine();
  }
  //1010 = ERROR
  if (digitalRead(X3) == HIGH && digitalRead(X2) == LOW && digitalRead(X1) == HIGH && digitalRead(X0) == LOW) {
    OutOfRange();
  }
  //1011 = ERROR
  if (digitalRead(X3) == HIGH && digitalRead(X2) == LOW && digitalRead(X1) == HIGH && digitalRead(X0) == HIGH) {
    OutOfRange();
  }
  //1100 = ERROR
  if (digitalRead(X3) == HIGH && digitalRead(X2) == HIGH && digitalRead(X1) == LOW && digitalRead(X0) == LOW) {
    OutOfRange();
  }
  //1101 = ERROR
  if (digitalRead(X3) == HIGH && digitalRead(X2) == HIGH && digitalRead(X1) == LOW && digitalRead(X0) == HIGH) {
    OutOfRange();
  }
  //1110 = ERROR
  if (digitalRead(X3) == HIGH && digitalRead(X2) == HIGH && digitalRead(X1) == HIGH && digitalRead(X0) == LOW) {
    OutOfRange();
  }
  //1111 = ERROR
  if (digitalRead(X3) == HIGH && digitalRead(X2) == HIGH && digitalRead(X1) == HIGH && digitalRead(X0) == HIGH) {
    OutOfRange();
  }
}

void zero() {
  //forms number 0
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, OFF);
  digitalWrite(segmentDP, OFF);
}

void one() {
  //forms number 1
  digitalWrite(segmentA, OFF);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, OFF);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, OFF);
  digitalWrite(segmentG, OFF);
  digitalWrite(segmentDP, OFF);
}

void two() {
  //forms number 2
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, OFF);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, OFF);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void three() {
  //forms number 3
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, OFF);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void four() {
  //forms number 4
  digitalWrite(segmentA, OFF);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, OFF);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void five() {
  //forms number 5
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, OFF);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void six() {
  //forms number 6
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, OFF);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void seven() {
  //forms number 7
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, OFF);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, OFF);
  digitalWrite(segmentG, OFF);
  digitalWrite(segmentDP, OFF);
}

void eight() {
  //forms number 8
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void nine() {
  //forms number 9
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, OFF);
}

void OutOfRange() {
  //ERROR
  letterE();
  delay(setdelay);
  dotonly();
  delay(setdelay);
  letterR();
  delay(setdelay);
  dotonly();
  delay(setdelay);
  letterR();
  delay(setdelay);
  dotonly();
  delay(setdelay);
  letterO();
  delay(setdelay);
  dotonly();
  delay(setdelay);
  letterR();
  delay(setdelay);
  dotonly();
  delay(1000); // 1000 = 1s
}

void letterE() {
  //forms letter E + dot
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, OFF);
  digitalWrite(segmentC, OFF);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, ON);
}

void letterR() {
  //forms letter R + dot
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, OFF);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, ON);
  digitalWrite(segmentDP, ON);
}

void letterO() {
  //forms letter O + dot
  digitalWrite(segmentA, ON);
  digitalWrite(segmentB, ON);
  digitalWrite(segmentC, ON);
  digitalWrite(segmentD, ON);
  digitalWrite(segmentE, ON);
  digitalWrite(segmentF, ON);
  digitalWrite(segmentG, OFF);
  digitalWrite(segmentDP, ON);
}

void dotonly() {
  //only DP
  digitalWrite(segmentA, OFF);
  digitalWrite(segmentB, OFF);
  digitalWrite(segmentC, OFF);
  digitalWrite(segmentD, OFF);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, OFF);
  digitalWrite(segmentG, OFF);
  digitalWrite(segmentDP, ON);
}

void segmentTest() {
  //turns on and off each segment
  digitalWrite(segmentA, ON);
  delay(setdelay);
  digitalWrite(segmentA, OFF);
  digitalWrite(segmentB, ON);
  delay(setdelay);
  digitalWrite(segmentB, OFF);
  digitalWrite(segmentC, ON);
  delay(setdelay);
  digitalWrite(segmentC, OFF);
  digitalWrite(segmentD, ON);
  delay(setdelay);
  digitalWrite(segmentD, OFF);
  digitalWrite(segmentE, ON);
  delay(setdelay);
  digitalWrite(segmentE, OFF);
  digitalWrite(segmentF, ON);
  delay(setdelay);
  digitalWrite(segmentF, OFF);
  digitalWrite(segmentG, ON);
  delay(setdelay);
  digitalWrite(segmentG, OFF);
  digitalWrite(segmentDP, ON);
  delay(setdelay);
  digitalWrite(segmentDP, OFF);
  delay(setdelay);
  digitalWrite(segmentDP, ON);
  delay(setdelay);
  digitalWrite(segmentDP, OFF);
  delay(setdelay);
  digitalWrite(segmentDP, ON);
  delay(setdelay);
  digitalWrite(segmentDP, OFF);
  delay(setdelay);
  digitalWrite(segmentDP, ON);
  delay(setdelay);
  digitalWrite(segmentDP, OFF);
}