/*  LucidTronix code for typing on an LCD Screen *  Uses the liquid Crystal library as well as our *  DIY Keyboard *  See the tutorial at: *  http://lucidtronix.com/tutorials/46 */#include #define SHIFT '@'#define ENTER '#'#define DELETE '^'// initialize the library with the numbers of the interface pins and the original messageLiquidCrystal lcd(6, 7, 19, 18, 17, 16);String message = "        ";// keyboard specificint dataPin = 8;//12int clockPin = 9;//11int latchPin = 10;//10String letters[] ={"yz #^@.!","qrstuvwx","ijklmnop", "abcdefgh"};  //"edcbahgf"String letters_cap[] ={"YZ #^@.!","QRSTUVWX","IJKLMNOP","ABCDEFGH" };int num_registers = 4;byte button_states[] = {0x00,0x00,0x00,0x00};  //01 00 10 00char key_pressed;boolean something_in = false;boolean shift_state = 0;// some more initializationint mode = 0;int num_modes = 2;int cur_scroll = 0;int cur_msg_length = 0;int cursor_index = 0;int line_index = 0;int char_index = 0;unsigned long last_press = 0;int scroll_pos = 0;void setup() {  // set up the LCD's number of columns and rows:   lcd.begin(16, 2);  // Print a message to the LCD.  lcd.print("hello!!");  delay(500);  lcd.blink();    // setup the pins for the keyboard  pinMode(dataPin, INPUT);  pinMode(clockPin, OUTPUT);  pinMode(latchPin, OUTPUT);    // setup the size of the message  pad_string_with_zeros( &message, 32 );}void loop() {  read_keyboard();  write_message();  scroll_message();    delay(50);}void scroll_message() {  if (analogRead(1) < 200 ) {    lcd.scrollDisplayLeft();    scroll_pos++;    if (scroll_pos > 31) scroll_pos = 0;    delay (4*analogRead(1));    }  else if (analogRead(1) > 400){    //Maybe wont werk    scroll_pos = 0;    lcd.setCursor(0,0);    /*    if (scroll_pos > 0) {      for (int i=0; ilength();    if ( s < s_max ) {    String zeros;    for (int i=0; i<=s_max-s-1; i++){      zeros += " ";    }     *str = *str + zeros;  }}void read_keyboard(){  if (millis() - last_press > 400) {    //set it to 0 to transmit data serially      digitalWrite(latchPin,LOW);    //while the shift register is in serial mode    //collect each shift register into a byte    //the register attached to the chip comes in first         for (int i = 0; i < num_registers; i++){      button_states[i] = shiftIn(dataPin, clockPin);    }    digitalWrite(latchPin,HIGH);    something_in = false;        for (int i = 0; i < num_registers; i++){            if (!shift_state) something_in = translate_buttons_2_keys(button_states[i], letters[i]);      else              something_in = translate_buttons_2_keys(button_states[i], letters_cap[i]);            if (something_in) {        last_press = millis();        break;      }    }              }}boolean translate_buttons_2_keys(byte buttons, String letter_group){  for(int i = 0 ; i < 8; i++){       if ( (1 << i) & buttons ){       key_pressed = letter_group[i];              message[line_index*16+cursor_index] = key_pressed;       return true;     }       }    return false; }void shift_pressed() { shift_state = !shift_state; }void enter_pressed() { if (!line_index) line_index = 1; }void delete_pressed() { delete_char(); }byte shiftIn(int myDataPin, int myClockPin) {   int i;  int temp = 0;  int pinState;  byte myDataIn = 0;  pinMode(myClockPin, OUTPUT);  pinMode(myDataPin, INPUT);  for (i=7; i>=0; i--)  {    digitalWrite(myClockPin, 0);    delayMicroseconds(20);    temp = digitalRead(myDataPin);    if (temp) {      pinState = 1;      myDataIn = myDataIn | (1 << i);    }    else {      pinState = 0;    }    digitalWrite(myClockPin, 1);  }  return myDataIn;}