So we first created a function for each mode the Enigma operates in:

In Mode 0, Default Mode, the Enigma is nothing but a simple typewriter with a Marquee that displays its Model Number.

Mode 1 allows the user to select the 3 (out of 8) Rotors he will use along with which one (of the 2) Reflector he wants to use.

In Mode 2, the user can select the Internal position of each Rotor.

Mode 3 is used to specify the starting (external) position of each Rotor.

In Mode 4, a user can enter up to 10 Swapped pairs of letters.

Mode 5 is Run mode and at that point, the Enigma will encrypt or decrypt any letter typed on the keyboard.



Here is the Complete sketch that runs the whole Enigma:



/* S&T GeoTronics Enigma Code. This Arduino Mega custom shield is programmed to replicate

exactly the behavior of a true German M4 Enigma machine.

It uses 4 16-Segment units, 5 LEDs, 26 Lamps setup as keyboard, 26 keyboard buttons

& 10 Function keys. The 115 light emitting diodes are charlie-plexed to minimize the

amount of pins needed down to 38 and all 36 pushbuttons keys are sharing a total of 4 pins.

Designed, assembled & programmed by Marc Tessier & James Sanderson 9/20/13

*/

// Define the variables

unsigned long time = millis();

unsigned long otime = time;

int inpin[4] = {A0, A1, A2, A3};

int inval[4] = {0, 0, 0, 0};

int keyval = 100;

boolean windex = 0;

boolean windex1 = 0;

boolean windex2 = 0;

int lampval = 100;

int procesval = 0;

int procesvala = 0;

int mode = 0;

unsigned long mtime;

int mdex =0;



// Define each Nixie character

int dig1 = 37;

int dig2 = 37;

int dig3 = 37;

int dig4 = 37;



int data[36] = {36,36,36,36,18,39,19,36,6,4,14,19,17,14,13,8,2,18,36,4,13,8,6,12,0,36,12,0,17,10,36,30,36,36,36,36} ;



// Define the 16-Segments Pins as 2 Arrays

int segment[17] = {24,22,25,31,38,36,32,30,28,26,23,27,33,35,34,29,37}; //cathode array

int anode[4] = {39,41,43,45}; //annode array commin annode



// Define the 26 Lamps as a 2D Array

int lamparray[26] [2] = {{12,10},{13,5},{13,7},{12,8},{11,8},{12,7,},{12,6},{12,5},{11,3},{12,4},

{12,3},{13,2},{13,3},{13,4},{11,2},{13,10},{11,10},{11,7},{12,9},{11,6},

{11,4},{13,6},{11,9},{13,8},{13,9},{11,5}};



// Define the 12 Lamp Pins for initialization

int lamppin[12] = {2,3,4,5,6,7,8,9,10,11,12,13}; //2 to 10 cathode, 11 to 13 common annode



// Define each LTP587P Segments: A,B,C,D,E,F,G,H,K,M,N,P,R,S,T,U,dp

boolean segmentvals[40][17] = { { 0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1 }, // = A 0

{ 0,0,0,0,0,0,1,1,1,0,1,0,1,0,1,1,1 }, // = B 1

{ 0,0,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1 }, // = C 2

{ 0,0,0,0,0,0,1,1,1,0,1,1,1,0,1,1,1 }, // = D 3

{ 0,0,1,1,0,0,0,0,1,1,1,0,1,1,1,0,1 }, // = E 4

{ 0,0,1,1,1,1,0,0,1,1,1,0,1,1,1,0,1 }, // = F 5

{ 0,0,1,0,0,0,0,0,1,1,1,0,1,1,1,1,1 }, // = G 6

{ 1,1,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1 }, // = H 7

{ 0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,1 }, // = I 8

{ 1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1 }, // = J 9

{ 1,1,1,1,1,1,0,0,1,1,0,1,0,1,1,0,1 }, // = K 10

{ 1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1 }, // = L 11

{ 1,1,0,0,1,1,0,0,0,1,0,1,1,1,1,1,1 }, // = M 12

{ 1,1,0,0,1,1,0,0,0,1,1,1,0,1,1,1,1 }, // = N 13

{ 0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1 }, // = O 14

{ 0,0,0,1,1,1,0,0,1,1,1,0,1,1,1,0,1 }, // = P 15

{ 0,0,0,0,0,0,0,0,1,1,1,1,0,1,1,1,1 }, // = Q 16

{ 0,0,0,1,1,1,0,0,1,1,1,0,0,1,1,0,1 }, // = R 17

{ 0,0,1,0,0,0,1,0,1,1,1,0,1,1,1,0,1 }, // = S 18

{ 0,0,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1 }, // = T 19

{ 1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1 }, // = U 20

{ 1,1,1,1,1,1,0,0,1,1,0,1,1,1,0,1,1 }, // = V 21

{ 1,1,0,0,1,1,0,0,1,1,1,1,0,1,0,1,1 }, // = W 22

{ 1,1,1,1,1,1,1,1,0,1,0,1,0,1,0,1,1 }, // = X 23

{ 1,1,1,1,1,1,1,1,0,1,0,1,1,0,1,1,1 }, // = Y 24

{ 0,0,1,1,0,0,1,1,1,1,0,1,1,1,0,1,1 }, // = Z 25

{ 0,0,0,0,0,0,0,0,1,1,0,1,1,1,0,1,1 }, // = 0 26

{ 1,1,0,0,1,1,1,1,1,1,0,1,1,1,1,1,1 }, // = 1 27

{ 0,0,0,1,0,0,0,1,1,1,1,0,1,1,1,0,1 }, // = 2 28

{ 0,0,0,0,0,0,1,1,1,1,1,0,1,1,1,1,1 }, // = 3 29

{ 1,1,0,0,1,1,1,0,1,1,1,0,1,1,1,0,1 }, // = 4 30

{ 0,0,1,0,0,0,1,0,1,1,1,0,1,1,1,0,1 }, // = 5 31

{ 0,0,1,0,0,0,0,0,1,1,1,0,1,1,1,0,1 }, // = 6 32

{ 0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1 }, // = 7 33

{ 0,0,0,0,0,0,0,0,1,1,1,0,1,1,1,0,1 }, // = 8 34

{ 0,0,0,0,0,0,1,0,1,1,1,0,1,1,1,0,1 }, // = 9 35

{ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 }, // = Space 36

{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }, // = Full Lit 37

{ 1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1 }, // = SS 38

{ 0,1,1,1,0,0,0,1,0,0,1,1,0,1,1,0,1} }; // = & 39

// LTP587P Segments: A,B,C,D,E,F,G,H,K,M,N,P,R,S,T,U,dp



// Define the 5 Mode LEDs

int led1 = 40;

int led2 = 42;

int led3 = 44;

int led4 = 46;

int led5 = 48;



//4,10,12, 5,11, 6, 3,16,21,25,13,19,14,22,24, 7,23,20,18,15, 0, 8, 1,17, 2, 9

//Define the rotor values A B C D E F G H I J K L M N O P Q

static const int rotorvals[12][78] = { { 4,10,12, 5,11, 6, 3,16,21,25,13,19,14,22,24, 7,123,20,18,15, 0, 8, 1,17, 2, 9,

4,10,12, 5,11, 6, 3,16,21,25,13,19,14,22,24, 7,123,20,18,15, 0, 8, 1,17, 2, 9,

4,10,12, 5,11, 6, 3,16,21,25,13,19,14,22,24, 7,123,20,18,15, 0, 8, 1,17, 2, 9 }, // wheel 1



{ 0, 9, 3,10,118, 8,17,20,23, 1,11, 7,22,19,12, 2,16, 6,25,13,15,24, 5,21,14, 4,

0, 9, 3,10,118, 8,17,20,23, 1,11, 7,22,19,12, 2,16, 6,25,13,15,24, 5,21,14, 4,

0, 9, 3,10,118, 8,17,20,23, 1,11, 7,22,19,12, 2,16, 6,25,13,15,24, 5,21,14, 4 }, // wheel 2



{ 1, 3, 5, 7, 9,11, 2,15,17,19,23,21,25,13,24, 4, 8,22, 6, 0,10,112,20,18,16,14,

1, 3, 5, 7, 9,11, 2,15,17,19,23,21,25,13,24, 4, 8,22, 6, 0,10,112,20,18,16,14,

1, 3, 5, 7, 9,11, 2,15,17,19,23,21,25,13,24, 4, 8,22, 6, 0,10,112,20,18,16,14 }, // wheel 3



{ 4,18,14,21,15,25, 9, 0,24,116,20, 8,17, 7,23,11,13, 5,19, 6,10, 3, 2,12,22, 1,

4,18,14,21,15,25, 9, 0,24,116,20, 8,17, 7,23,11,13, 5,19, 6,10, 3, 2,12,22, 1,

4,18,14,21,15,25, 9, 0,24,116,20, 8,17, 7,23,11,13, 5,19, 6,10, 3, 2,12,22, 1 }, // wheel 4



{ 21,25, 1,17, 6, 8,19,24,20,15,18, 3,13, 7,11,23, 0,22,12, 9,16,14, 5, 4, 2,110,

21,25, 1,17, 6, 8,19,24,20,15,18, 3,13, 7,11,23, 0,22,12, 9,16,14, 5, 4, 2,110,

21,25, 1,17, 6, 8,19,24,20,15,18, 3,13, 7,11,23, 0,22,12, 9,16,14, 5, 4, 2,110 }, // wheel 5



{ 9,15, 6,21,14,20,12, 5,24,16, 1, 4,113, 7,25,17, 3,10, 0,18,23,11, 8, 2,19,122,

9,15, 6,21,14,20,12, 5,24,16, 1, 4,113, 7,25,17, 3,10, 0,18,23,11, 8, 2,19,122,

9,15, 6,21,14,20,12, 5,24,16, 1, 4,113, 7,25,17, 3,10, 0,18,23,11, 8, 2,19,122 }, // wheel 6



{ 13,25, 9, 7, 6,17, 2,23,12,24,18,22,101,14,20, 5, 0, 8,21,11,15, 4,10,16, 3,119,

13,25, 9, 7, 6,17, 2,23,12,24,18,22,101,14,20, 5, 0, 8,21,11,15, 4,10,16, 3,119,

13,25, 9, 7, 6,17, 2,23,12,24,18,22,101,14,20, 5, 0, 8,21,11,15, 4,10,16, 3,119 }, // wheel 7



{ 5,10,16, 7,19,11,23,14, 2, 1, 9,18,115, 3,25,17, 0,12, 4,22,13, 8,20,24, 6,121,

5,10,16, 7,19,11,23,14, 2, 1, 9,18,115, 3,25,17, 0,12, 4,22,13, 8,20,24, 6,121,

5,10,16, 7,19,11,23,14, 2, 1, 9,18,115, 3,25,17, 0,12, 4,22,13, 8,20,24, 6,121 }, // wheel 8



{ 11,4,24,9,21,2,13,8,23,22,15,1,16,12,3,17,19,0,10,25,6,5,20,7,14,18,

11,4,24,9,21,2,13,8,23,22,15,1,16,12,3,17,19,0,10,25,6,5,20,7,14,18,

11,4,24,9,21,2,13,8,23,22,15,1,16,12,3,17,19,0,10,25,6,5,20,7,14,18 }, // Beta



{ 5,18,14,10,0,13,20,4,17,7,12,1,19,8,24,2,22,11,16,15,25,23,21,6,9,3,

5,18,14,10,0,13,20,4,17,7,12,1,19,8,24,2,22,11,16,15,25,23,21,6,9,3,

5,18,14,10,0,13,20,4,17,7,12,1,19,8,24,2,22,11,16,15,25,23,21,6,9,3 }, // Gamma



{ 4,13,10,16,0,20,24,22,9,8,2,14,15,1,11,12,3,23,25,21,5,19,7,17,6,18,

4,13,10,16,0,20,24,22,9,8,2,14,15,1,11,12,3,23,25,21,5,19,7,17,6,18,

4,13,10,16,0,20,24,22,9,8,2,14,15,1,11,12,3,23,25,21,5,19,7,17,6,18}, // = UKW-B



{ 17,3,14,1,9,13,19,10,21,4,7,12,11,5,2,22,25,0,23,6,24,8,15,18,20,16,

17,3,14,1,9,13,19,10,21,4,7,12,11,5,2,22,25,0,23,6,24,8,15,18,20,16,

17,3,14,1,9,13,19,10,21,4,7,12,11,5,2,22,25,0,23,6,24,8,15,18,20,16 } // = UKW-C

};





static const int rotorvali[10][78] = { { 20,22,24, 6, 0, 3, 5,15,21,25, 1, 4, 2,10,12,19, 7,23,18,11,17, 8,13,16,14, 9,

20,22,24, 6, 0, 3, 5,15,21,25, 1, 4, 2,10,12,19, 7,23,18,11,17, 8,13,16,14, 9,

20,22,24, 6, 0, 3, 5,15,21,25, 1, 4, 2,10,12,19, 7,23,18,11,17, 8,13,16,14, 9 }, //wheel 1 i

//

{ 0, 9,15, 2,25,22,17,11, 5, 1, 3,10,14,19,24,20,16, 6, 4,13, 7,23,12, 8,21,18,

0, 9,15, 2,25,22,17,11, 5, 1, 3,10,14,19,24,20,16, 6, 4,13, 7,23,12, 8,21,18,

0, 9,15, 2,25,22,17,11, 5, 1, 3,10,14,19,24,20,16, 6, 4,13, 7,23,12, 8,21,18 }, //wheel 2 i



{ 19, 0, 6, 1,15, 2,18, 3,16, 4,20, 5,21,13,25, 7,24, 8,23, 9,22,11,17,10,14,12,

19, 0, 6, 1,15, 2,18, 3,16, 4,20, 5,21,13,25, 7,24, 8,23, 9,22,11,17,10,14,12,

19, 0, 6, 1,15, 2,18, 3,16, 4,20, 5,21,13,25, 7,24, 8,23, 9,22,11,17,10,14,12 }, //wheel 3 i





{ 7,25,22,21, 0,17,19,13,11, 6,20,15,23,16, 2, 4, 9,12, 1,18,10, 3,24,14, 8, 5,

7,25,22,21, 0,17,19,13,11, 6,20,15,23,16, 2, 4, 9,12, 1,18,10, 3,24,14, 8, 5,

7,25,22,21, 0,17,19,13,11, 6,20,15,23,16, 2, 4, 9,12, 1,18,10, 3,24,14, 8, 5 }, //wheel 4 i



{ 16, 2,24,11,23,22, 4,13, 5,19,25,14,18,12,21, 9,20, 3,10, 6, 8, 0,17,15, 7, 1,

16, 2,24,11,23,22, 4,13, 5,19,25,14,18,12,21, 9,20, 3,10, 6, 8, 0,17,15, 7, 1,

16, 2,24,11,23,22, 4,13, 5,19,25,14,18,12,21, 9,20, 3,10, 6, 8, 0,17,15, 7, 1 }, //wheel 5 i



{ 18,10,23,16,11, 7, 2,13,22, 0,17,21,06,12, 4, 1, 9,15,19,24, 5, 3, 25,20, 8,14,

18,10,23,16,11, 7, 2,13,22, 0,17,21,06,12, 4, 1, 9,15,19,24, 5, 3, 25,20, 8,14,

18,10,23,16,11, 7, 2,13,22, 0,17,21,06,12, 4, 1, 9,15,19,24, 5, 3, 25,20, 8,14 }, //wheel 6 i



{ 16,12,6,24,21,15,4,3,17,2,22,19,8,0,13,20,23,5,10,25,14,18,11,7,9,1,

16,12,6,24,21,15,4,3,17,2,22,19,8,0,13,20,23,5,10,25,14,18,11,7,9,1,

16,12,6,24,21,15,4,3,17,2,22,19,8,0,13,20,23,5,10,25,14,18,11,7,9,1 }, //wheel 7 i



{ 16,9,8,13,18,0,24,3,21,10,1,5,17,20,7,12,2,15,11,4,22,25,19,6,23,14,

16,9,8,13,18,0,24,3,21,10,1,5,17,20,7,12,2,15,11,4,22,25,19,6,23,14,

16,9,8,13,18,0,24,3,21,10,1,5,17,20,7,12,2,15,11,4,22,25,19,6,23,14 }, //wheel 8 i



{ 17,11,5,14,1,21,20,23,7,3,18,0,13,6,24,10,12,15,25,16,22,4,9,8,2,19,

17,11,5,14,1,21,20,23,7,3,18,0,13,6,24,10,12,15,25,16,22,4,9,8,2,19,

17,11,5,14,1,21,20,23,7,3,18,0,13,6,24,10,12,15,25,16,22,4,9,8,2,19 }, //Beta i



{ 4,11,15,25,7,0,23,9,13,24,3,17,10,5,2,19,18,8,1,12,6,22,16,21,14,20,

4,11,15,25,7,0,23,9,13,24,3,17,10,5,2,19,18,8,1,12,6,22,16,21,14,20,

4,11,15,25,7,0,23,9,13,24,3,17,10,5,2,19,18,8,1,12,6,22,16,21,14,20 } }; //Gamma i





// Define a 2D Array for keeping the wheel locations & positions

int wheel[3][3] = {{26,0,0},{26,0,0},{26,0,0}};

int reflect[2] = {1,0};



// Define Array for plugbord values 25 x2 position 0 holds use position 1 holds value int plugu holds the total nomber of plugs used (10 max)

int plugval [2][26] = {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25}};

int pluguse = 0; int paindex = 0; int pbindex = 1;





void setup() {

// Initialize all 38 LED pins as Output

for (int index = 0; index <= 11; index++) {

pinMode(lamppin[index], OUTPUT);

digitalWrite(lamppin[index],1);

}

for (int index = 0 ; index <= 3; index++) {

pinMode (anode[index], OUTPUT);

digitalWrite (anode[index], 1);

}

for (int index = 0 ; index <= 16; index++) {

pinMode (segment[index], OUTPUT);

digitalWrite (segment[index], 1);

}

pinMode(led1,OUTPUT);

pinMode(led2,OUTPUT);

pinMode(led3,OUTPUT);

pinMode(led4,OUTPUT);

pinMode(led5,OUTPUT);



// Serial.begin(9600);

// Initialize all 4 pusbutton pins as Input

for (int index = 0; index <= 3; index++) {

pinMode(inpin[index], INPUT);

}



}



void loop() {

// Keyboard debounce & test for new key pressed

time = millis();

if (time > otime + 500) {keyval = readkbde();}

if((keyval == 45) && (windex ==1)) {modeselect();}

// The whole Enigma machine operation revolves around which Operating Mode is current

if(mode == 0) {mode0();}

else if(mode == 1) {mode1();}

else if(mode == 2) {mode2();}

else if(mode == 3) {mode3();}

else if(mode == 4) {mode4();}

else if(mode == 5) {mode5();}

else { }



//Serial.println(keyval); // for debuging prints keybord value to serial monitor// for run or del



}



// This function takes care of figuring out which key has been pressed & returns a unique Integer

int readkbde() {

int kval = 100;

for (int index = 0; index <= 3; index++) { inval[index] = analogRead(inpin[index]); } //Reads analog input values

if((inval[0] > 925) && (inval[1] > 828) && (inval[2] > 730) && (inval[3] > 828)) {kval = 100;} // no key press

else if((inval[0] < 924) && (inval[0] > 915)) {kval = 49;} //up arrow 4

else if((inval[0] < 914) && (inval[0] > 903)) {kval = 48;} //up arrow 3

else if((inval[0] < 902) && (inval[0] > 887)) {kval = 47;} //up arrow 2

else if((inval[0] < 886) && (inval[0] > 865)) {kval = 46;} //up arrow 1

else if((inval[0] < 864) && (inval[0] > 836)) {kval = 45;} //mode

else if((inval[0] < 834) && (inval[0] > 793)) {kval = 44;} //enter

else if((inval[0] < 792) && (inval[0] > 724)) {kval = 43;}

else if((inval[0] < 723) && (inval[0] > 594)) {kval = 42;}

else if((inval[0] < 593) && (inval[0] > 260)) {kval = 41;}

else if(inval[0] < 259 ) {kval = 40;}

else if((inval[1] < 827) && (inval[1] > 807)) {kval = 14;}

else if((inval[1] < 806) && (inval[1] > 781)) {kval = 8;}

else if((inval[1] < 780) && (inval[1] > 749)) {kval = 20;}

else if((inval[1] < 748) && (inval[1] > 706)) {kval = 25;}

else if((inval[1] < 705) && (inval[1] > 647)) {kval = 19;}

else if((inval[1] < 646) && (inval[1] > 555)) {kval = 17;}

else if((inval[1] < 554) && (inval[1] > 418)) {kval = 4;}

else if((inval[1] < 417) && (inval[1] > 169)) {kval = 22;}

else if(inval[1] < 168 ) {kval = 16;}

else if((inval[2] < 729) && (inval[2] > 699)) {kval = 10;}

else if((inval[2] < 698) && (inval[2] > 660)) {kval = 9;}

else if((inval[2] < 659) && (inval[2] > 611)) {kval = 7;}

else if((inval[2] < 610) && (inval[2] > 547)) {kval = 6;}

else if((inval[2] < 546) && (inval[2] > 455)) {kval = 5;}

else if((inval[2] < 454) && (inval[2] > 331)) {kval = 3;}

else if((inval[2] < 330) && (inval[2] > 127)) {kval = 18;}

else if(inval[2] < 126 ) {kval = 0;}

else if((inval[3] < 827) && (inval[3] > 807)) {kval = 11;}

else if((inval[3] < 806) && (inval[3] > 781)) {kval = 12;}

else if((inval[3] < 780) && (inval[3] > 749)) {kval = 13;}

else if((inval[3] < 748) && (inval[3] > 706)) {kval = 1;}

else if((inval[3] < 705) && (inval[3] > 647)) {kval = 21;}

else if((inval[3] < 646) && (inval[3] > 555)) {kval = 2;}

else if((inval[3] < 554) && (inval[3] > 418)) {kval = 23;}

else if((inval[3] < 417) && (inval[3] > 169)) {kval = 24;}

else if(inval[3] < 169 ) {kval = 15;}

else {kval = 100;}

if(kval < 99) {otime = millis();} //Starts key debounce timer

if((kval >= 0) && (kval <= 99)) {windex = 1;} //windex showing true (1) indicates the return of a fresh key stroke

return kval;

}



// Function to change operating Mode

void modeselect() {

mode++;

if(mode >=6) {mode = 0;}

windex = 0;

}



// Default Mode: Enigma is a Typewriter

void mode0() {

if((keyval >= 0) && (keyval <= 25)) {lampval = keyval;}

lampita();

marquee();

lampitb();

}



// Select the Rotors & the Reflector

void mode1() {

int index;

digitalWrite(led1, HIGH);

if(windex == 1) {if((keyval == 43) || (keyval == 46)) {reflect[0]++; if (reflect[0] > 2) {reflect[0] = 1;} windex = 0;}}

if(windex == 1) {if(keyval == 47) { for(index = wheel[2][0];(index == wheel[1][0]) || (index == wheel[0][0]) || (index == wheel[2][0]);

index++) {if(index > 33) {index = 26;} }wheel[2][0] = index; windex = 0;}}

if(windex == 1) {if(keyval == 48) { for(index = wheel[1][0];(index == wheel[2][0]) || (index == wheel[0][0]) || (index == wheel[1][0]);

index++) {if(index > 33) {index = 26;} }wheel[1][0] = index; windex = 0;}}

if(windex == 1) {if(keyval == 49) { for(index = wheel[0][0];(index == wheel[2][0]) || (index == wheel[1][0]) || (index == wheel[0][0]);

index++) {if(index > 33) {index = 26;} }wheel[0][0] = index; windex = 0;}}

if(windex == 1) {if(keyval == 42) { for(index = wheel[2][0];(index == wheel[1][0]) || (index == wheel[0][0]) || (index == wheel[2][0]);

index--) {if(index < 28) {index = 35;} }wheel[2][0] = index; windex = 0;}}

if(windex == 1) {if(keyval == 41) { for(index = wheel[1][0];(index == wheel[2][0]) || (index == wheel[0][0]) || (index == wheel[1][0]);

index--) {if(index < 28) {index = 35;} }wheel[1][0] = index; windex = 0;}}

if(windex == 1) {if(keyval == 40) { for(index = wheel[0][0];(index == wheel[2][0]) || (index == wheel[1][0]) || (index == wheel[0][0]);

index--) {if(index < 28) {index = 35;} }wheel[0][0] = index; windex = 0;}}

dig2 = wheel[2][0]; dig3 = wheel[1][0]; dig4 = wheel[0][0]; dig1 = reflect[0];

nixisend();

dig1 =37; dig2 = 37; dig3 = 37; dig4 = 37;

digitalWrite(led1, LOW);

}



// Position the Inner setting of each Rotor

void mode2() {

digitalWrite(led2, HIGH);

if(windex == 1){

if(keyval == 47) {wheel[2][1]++; if(wheel[2][1] > 25) {wheel[2][1] = 0;}}

if(keyval == 48) {wheel[1][1]++; if(wheel[1][1] > 25) {wheel[1][1] = 0;}}

if(keyval == 49) {wheel[0][1]++; if(wheel[0][1] > 25) {wheel[0][1] = 0;}}

if(keyval == 42) {wheel[2][1]--; if(wheel[2][1] < 0) {wheel[2][1] = 25;}}

if(keyval == 41) {wheel[1][1]--; if(wheel[1][1] < 0) {wheel[1][1] = 25;}}

if(keyval == 40) {wheel[0][1]--; if(wheel[0][1] < 0) {wheel[0][1] = 25;}}

windex = 0; }



dig2 = wheel[2][1]; dig3 = wheel[1][1]; dig4 = wheel[0][1]; dig1 = 0;

nixisend();

dig1 =37; dig2 = 37; dig3 = 37; dig4 = 37;

digitalWrite(led2, LOW);

}



// Position the Start character of each Wheel

void mode3() {

digitalWrite(led3, HIGH);

if(windex == 1){

if(keyval == 46) {reflect[1]++; if(reflect[1] > 25) {reflect[1] = 0;}}

if(keyval == 47) {wheel[2][2]++; if(wheel[2][2] > 25) {wheel[2][2] = 0;}}

if(keyval == 48) {wheel[1][2]++; if(wheel[1][2] > 25) {wheel[1][2] = 0;}}

if(keyval == 49) {wheel[0][2]++; if(wheel[0][2] > 25) {wheel[0][2] = 0;}}

if(keyval == 43) {reflect[1]--; if(reflect[1] < 0) {reflect[1] = 25;}}

if(keyval == 42) {wheel[2][2]--; if(wheel[2][2] < 0) {wheel[2][2] = 25;}}

if(keyval == 41) {wheel[1][2]--; if(wheel[1][2] < 0) {wheel[1][2] = 25;}}

if(keyval == 40) {wheel[0][2]--; if(wheel[0][2] < 0) {wheel[0][2] = 25;}}

windex = 0; }



dig2 = wheel[2][2]; dig3 = wheel[1][2]; dig4 = wheel[0][2]; dig1 = reflect[1];

nixisend();

dig1 =37; dig2 = 37; dig3 = 37; dig4 = 37;

digitalWrite(led3, LOW);

}



// Define the Plugboard pairs

void mode4() {

int index = 0;

digitalWrite(led4, HIGH);

if(pluguse <= 9) {

if(plugval[0][paindex] == 1) {for(index = paindex;(index == paindex) || (index == pbindex) || (plugval[0][index] == 1); index++) {if(index > 24) {index = -1;}} paindex = index;}

if(plugval[0][pbindex] == 1) {for(index = pbindex;(index == pbindex) || (index == paindex) || (plugval[0][index] == 1); index++) {if(index > 24) {index = -1;}} pbindex = index;}

if(windex == 1) {

if(keyval == 46) { for(index = paindex;(index == paindex) || (index == pbindex) || (plugval[0][index] == 1); index++) {if(index > 24) {index = -1;}} paindex = index; windex = 0; }

if(keyval == 43) { for(index = paindex;(index == paindex) || (index == pbindex) || (plugval[0][index] == 1); index--) {if(index < 1) {index = 26;}} paindex = index; windex = 0; }

if(keyval == 49) { for(index = pbindex;(index == pbindex) || (index == paindex) || (plugval[0][index] == 1); index++) {if(index > 24) {index = -1;}} pbindex = index; windex = 0; }

if(keyval == 40) { for(index = pbindex;(index == pbindex) || (index == paindex) || (plugval[0][index] == 1); index--) {if(index < 1) {index = 26;}} pbindex = index; windex = 0; }

if(keyval == 44) { plugval[0][paindex] = 1; plugval[1][paindex] = pbindex; plugval[0][pbindex] = 1; plugval[1][pbindex] = paindex; windex = 0; pluguse++;}

}

dig2 = 19; dig3 = 14; dig4 = pbindex; dig1 = paindex;

nixisend();

dig1 =37; dig2 = 37; dig3 = 37; dig4 = 37;

}

else {done();}

digitalWrite(led4, LOW);

}



// This is Normal Operation Mode to Encrypt/Decrypt

void mode5() {

int pv = 0;

digitalWrite(led5, HIGH);



if((keyval >= 0) && (keyval <= 25)) { if(windex == 1){procesvala = keyval; indexwheels();}}

windex = 0;

procesval = procesvala;

procesval = plugval[1][procesval];

// Serial.print (procesval); Serial.print(" ");



pv = (procesval + (wheel[0][2] - wheel[0][1]));

if(pv < 0) {pv = pv + 26;}

procesval = rotorvals[wheel[0][0] -27][pv];

if(procesval >= 100) {procesval = procesval - 100;}

procesval = (procesval - (wheel[0][2] - wheel[0][1]));

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

// Serial.print (procesval); Serial.print(" ");



pv = (procesval + (wheel[1][2] - wheel[1][1]));

if(pv < 0) {pv = pv + 26;}

procesval = rotorvals[wheel[1][0] -27][pv];

if(procesval >= 100) {procesval = procesval - 100;}

procesval = (procesval - (wheel[1][2] - wheel[1][1]));

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

// Serial.print (procesval); Serial.print(" ");



pv = (procesval + (wheel[2][2] - wheel[2][1]));

if(pv < 0) {pv = pv + 26;}

procesval = rotorvals[wheel[2][0] -27][pv];

if(procesval >= 100) {procesval = procesval - 100;}

procesval = (procesval - (wheel[2][2] - wheel[2][1]));

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

// Serial.print (procesval); Serial.print(" ");



pv = (procesval );

procesval = rotorvals[reflect[0] + 7][pv];

if(procesval >= 100) {procesval = procesval - 100;}

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

//Serial.print (procesval); Serial.print(" ");



procesval = rotorvals[reflect[0] + 9][procesval];

//Serial.print (procesval); Serial.print(" ");



pv = (procesval +26);

procesval = rotorvali[reflect[0] + 7][pv];

if(procesval >= 100) {procesval = procesval - 100;}

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

// Serial.print (procesval); Serial.print(" ");



pv = (procesval + (wheel[2][2] - wheel[2][1]));

if(pv < 0) {pv = pv + 26;}

procesval = rotorvali[wheel[2][0] -27][pv];

if(procesval >= 100) {procesval = procesval - 100;}

procesval = (procesval - (wheel[2][2] - wheel[2][1]));

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

//Serial.print (procesval); Serial.print(" ");



pv = (procesval + (wheel[1][2] - wheel[1][1]));

if(pv < 0) {pv = pv + 26;}

procesval = rotorvali[wheel[1][0] -27][pv];

if(procesval >= 100) {procesval = procesval - 100;}

procesval = (procesval - (wheel[1][2] - wheel[1][1]));

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}

//Serial.print (procesval); Serial.print(" ");



pv = (procesval + (wheel[0][2] - wheel[0][1]));

if(pv < 0) {pv = pv + 26;}

procesval = rotorvali[wheel[0][0] -27][pv];

if(procesval >= 100) {procesval = procesval - 100;}

procesval = (procesval - (wheel[0][2] - wheel[0][1]));

if(procesval < 0) {procesval = procesval + 26;}if(procesval > 25) {procesval = procesval - 26;}



// Serial.print (procesval); Serial.print(" ");



procesval = plugval[1][procesval];



lampval = procesval;

//Serial.println(lampval);

dig2 = wheel[2][2]; dig3 = wheel[1][2]; dig4 = wheel[0][2]; dig1 = reflect[1];

lampita();

nixisend();

lampitb();

dig1 =37; dig2 = 37; dig3 = 37; dig4 = 37;

digitalWrite(led5, LOW);

}



// Helper Function to light the proper key

void lampita() {

digitalWrite(lamparray[lampval][0],0);

digitalWrite(lamparray[lampval][1],0);

}

void lampitb(){

digitalWrite(lamparray[lampval][0],1);

digitalWrite(lamparray[lampval][1],1);

}



// Help Function to illuminate "Nixies"

void nixisend() {

sixteenSegWrite(0, dig1);

sixteenSegWrite(1, dig2);

sixteenSegWrite(2, dig3);

sixteenSegWrite(3, dig4);

}



void marquee() {



time = millis();

if( mtime < time) {

mtime = time + 400;

mdex++;}

dig1 = data[mdex];

dig2 = data[mdex + 1];

dig3 = data[mdex + 2];

dig4 = data[mdex + 3];

if (mdex >= 31) {mdex = 0;}

nixisend();



}

// Function that actually turns on each of 17 appropriate segments on each "Nixie"

void sixteenSegWrite(int digit, int character) {

digitalWrite(anode[digit],0);

for (int index = 0; index < 17; index++) {

digitalWrite(segment[index], segmentvals[character][index]);

}

delay(7);

for (int index =0; index <= 16; index++) {

digitalWrite(segment[index], 1);

}

digitalWrite(anode[digit], 1);

}



void done() {

dig1 = 3; dig2 = 14; dig3 = 13; dig4 = 4;

nixisend();

dig1 =37; dig2 = 37; dig3 = 37; dig4 = 37;

}



void indexwheels() {

// Serial.print(rotorvals[wheel[0][0]-27][wheel[0][2]]);

// Serial.print(" "); Serial.print(wheel[0][0]-27); Serial.print(" "); Serial.println(wheel[0][2]);

if(rotorvals[wheel[0][0]-27][wheel[0][2]] >= 100) {windex1 = 1;}

wheel[0][2]++; if(wheel[0][2] > 25) {wheel[0][2] = 0;}

windex = 0;

if(windex1 == 1){

if(rotorvals[wheel[1][0]-27][wheel[1][2]] >= 100) {windex2 = 1;}

wheel[1][2]++; if(wheel[1][2] > 25) {wheel[1][2] = 0;}}

windex1 = 0;

if(windex2 == 1){

wheel[2][2]++; if(wheel[2][2] > 25) {wheel[2][2] = 0;}

windex2 = 0; }

}



IF there is enough interest, we plan on are creating a PCB that would will allow for a much easier assembly of this wonderful fully functional Enigma replica. Please visit http://www.stgeotronics.com to find out about availability, pricing & to place your order or pre-order now. The Circuit schematics are published, so the PCB has entered it's development stage. Soon to be tested.



