#include <SoftwareSerial.h>
#define rxPin 2
#define txPin 3
#define buttonPin 4

SoftwareSerial mySerial(rxPin, txPin, true);
//  *
//  * ------------
//  *  Control a Serial LCD Display
//  *  
//  *  Tested on a Matrix Orbital model LCD0821 display.
//  *  Other diplays will work but may have slightly different 
//  *  command codes and hardware setups. 
//  *   
//  *  Copyleft 2006 by djmatic 
//  *  
//  *   ------------
//  *
//  *


// Declare your program variables here


// Arduino and LCD setup 

void setup()
{
  //beginSerial(19200);
 pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);
  pinMode(buttonPin, INPUT);     

  Serial.begin(9600);
  mySerial.begin(2400);
  //mySerial.begin(9600);
  delay(1000);
  clearLCD();

//       LCD setup commands: uncomment the ones you want to use
//       Note: These codes (i.e. the ones following 254) may have to be changed for 
//       different manufacturer's displays

//       Turn Auto scroll ON
//         Serial.print(254, BYTE);
//         Serial.print(81, BYTE);     
//       
//       Turn Auto scroll OFF
//         Serial.print(254, BYTE);
//         Serial.print(82, BYTE); 

//       Turn ON AUTO line wrap
//         Serial.print(254, BYTE); 
//         Serial.print(67, BYTE);              

//       Turn OFF AUTO line wrap
//         Serial.print(254, BYTE); 
//         Serial.print(68, BYTE); 

//       Turn OFF the block cursor    
//       Note that setting both block and underline 
//       cursors may give unpredictable results. 
           //Serial.print(254, BYTE);
           //Serial.print(84, BYTE);               
// moo Serial.write(254);
// moo         Serial.write(84);               

//       Turn ON the block cursor
//         Serial.print(254, BYTE);
//         Serial.print(83, BYTE);  

//       Turn ON the underline cursor
//         Serial.print(254, BYTE);
//         Serial.print(74, BYTE);               

//       Turn OFF the underline cursor
//         Serial.print(254, BYTE);
//         Serial.print(75, BYTE);               
}




//  MAIN CODE

void loop()
{ 
  //backlightOn(0);  // turn the backlight on all the time

  char c='A';
  clearLCD();
  int line=1;
  while(true) {
 
 
 
    cursorHome();

    int buttonState = digitalRead(buttonPin);
    if (buttonState) {
    Serial.println("Button active");
    } else {
     Serial.println("Button inactive"); 
    }
    
    line = 1-line;
    if (line==0) {
      goToStartOfLineOne();
    } else {
      goToStartOfLineTwo();
    }
    
    mySerial.write(c);
    if (buttonState) {
      mySerial.print(" : Hello Eliza");
    } else {
      mySerial.print(" : Hello Lotte");
    }
    delay(500);
    //for(int i=0;i<3;++i) {
    //  delay(100);
    //  scrollLeft();
    //}
    delay(1000);
    if (c!='Z') {
        c=c+1;
    } else {
      c='A';
    }
  }
}





//  LCD  FUNCTIONS-- keep the ones you need. 

// clear the LCD
void clearLCD(){
 mySerial.write(254);
 mySerial.write(1);
 delay(10);
 //Serial.println("I just did a CLS");
}


void goToStartOfLineOne(){
  mySerial.write(254);
   mySerial.write(128); 
}
void goToStartOfLineTwo(){
  mySerial.write(254);
   mySerial.write(192); 
}

//Make the text move to the left
void scrollLeft(){
  mySerial.write(254);
   mySerial.write(24);
}

// Make the text move to the right
void scrollRight(){
  mySerial.write(254);
   mySerial.write(28);
}


// Undoes scrolling and moves cursor to home pos.
void cursorHome(){
  mySerial.write(254);
   mySerial.write(2);
   delay(10);
}
  
// start a new line
void newLine() { 
  //Serial.write(10); 
}


// move the cursor to a specific place
// e.g.: cursorSet(3,2) sets the cursor to x = 3 and y = 2
void cursorSet(int xpos, int ypos){  
  //Serial.write(254);
 // Serial.write(71);               
 // Serial.print(xpos);   //Column position   
 // Serial.print(ypos); //Row position 
} 


// backspace and erase previous character
void backSpace() { 
 // Serial.write(8); 
}


// move cursor left
void cursorLeft(){    
  mySerial.write(254); 
  mySerial.write(16);   
}


// move cursor right
void cursorRight(){
  mySerial.write(254); 
  mySerial.write(20);   
}


// set LCD contrast
void setContrast(int contrast){
  //Serial.print(254, BYTE); 
  //Serial.print(80, BYTE);   
  //Serial.print(contrast);   
}


// turn on backlight
void backlightOn(int minutes){
  //Serial.print(254, BYTE); 
  //Serial.print(66, BYTE);   
  //Serial.print(minutes); // use 0 minutes to turn the backlight on indefinitely   
}


// turn off backlight
void backlightOff(){
  //Serial.print(254, BYTE); 
  //Serial.print(70, BYTE);   
}