/*
   Unit Converter

   Chris G
   8/20/23


#include <LiquidCrystal.h>
#include <Keypad.h>

//////// Display
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

//////// Keypad setup
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'i'},
  {'4', '5', '6', 'm'},
  {'7', '8', '9'},
  {'.', '0', ' ', 'c'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);




void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);

  lcd.clear();
  lcd.cursor();
  lcd.setCursor(0, 0);
}





const float Ratio = 25.4; //in to mm conversion ratio
String current = "";
float memory;
float converted;





void processInput(char key) {
  
//////// Conversion Buttons
//// Convert in to mm
if ('i' == key) {
    memory = current.toFloat();
    converted = memory * Ratio;
    current = "";
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print(converted, 4); lcd.print("mm");
    lcd.setCursor(0, 0); 
    return;
}

//// Convert mm to in
if ('m' == key){
    memory = current.toFloat();
    converted = memory / Ratio;
    current = "";
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print(converted, 4); lcd.print("in");
    lcd.setCursor(0, 0); 
    return;
}      

//////// Only allows typing 1 decimal point
if ('.' == key && current.indexOf('.') >= 0) {
    return;
 }

if ('.' != key && current == "0") {
    current = String(key);
  } else if (key) {
    current += String(key);
}

//////// Clear button
if ('c' == key){
  lcd.clear();
  current = "";
  memory = 0;
  return;
}



  lcd.print(key);
}





void loop() {

  char key = keypad.getKey();
  if (key) {
    processInput(key);
  }
}
*/

#include <LiquidCrystal.h> // include the library

LiquidCrystal lcd(12, 11, 10, 9, 8, 7); // define the arduino pins
              //rs, en, d4, d5, d6, d7 lcd pins

// Define 16x2 LCD
int screenWidth = 16;
int screenHeight = 2;

// To move ONLY one line needs to move one character at a time

// Define two line

String line1 = " LCD ep3: "; // stationary 
String line2 = " This is a one line scrolling tutorial! "; // scroll this line

int stringStart, stringEnd = 0;
int scrollCursor = screenWidth; 

void setup() {
  lcd.begin(screenWidth, screenHeight);
}

void loop() {

  lcd.setCursor(0, 0); // Seting the cursor on first row 
  lcd.print(line1); // To print line1 message
  lcd.setCursor(scrollCursor, 1); // Seting the cursor on first row and (scrolling from left end to right)
  lcd.print(line2.substring(stringStart,stringEnd)); // To print line1 first character "T"

  delay(500);
  
  lcd.clear(); // clear message
  
  if(stringStart == 0 && scrollCursor > 0){
    scrollCursor--; // Moving cursor from 16 to 0
    stringEnd++; // Character T, H, I, S ...
                 // it will print out character from 0 to 15 the whole length of the screen
  }
  else if (stringStart == stringEnd){ // start all over again
    stringStart = stringEnd = 0;
    scrollCursor = screenWidth;
  } 
  else if (stringEnd == line1.length() && scrollCursor == 0) { // if reach to the end character
    stringStart++;
  } 
  else { // it will print out character from (1 to 16) to end character (this case it's !))
    stringStart++;
    stringEnd++;
  }
}