/*
 LiquidCrystal Library - Hello World
 https://www.arduino.cc/en/Tutorial/HelloWorld
 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the
 Hitachi HD44780 driver. There are many of them out there, and you
 can usually tell them by the 16-pin interface.

 This sketch prints "Hello World!" to the LCD
 and shows the time.

  The circuit:
 * Typical 16 pin LCD display
 * (1)  LCD VSS pin to GND
 * (2)  LCD VDD/VCC to 5V
 * (3)  LCD V0 (Contrast)10K Pot between 5V and GND
 * (4)  LCD RS pin to Arduino digital pin 12
 * (5)  LCD R/W pin to GND
 * (6)  LCD Enable pin to Arduino digital pin 11
 * (7)  LCD D0 pin - N/C No Connect
 * (8)  LCD D1 pin - N/C No Connect
 * (9)  LCD D2 pin - N/C No Connect
 * (10) LCD D3 pin - N/C No Connect
 * (11) LCD D4 pin to Arduino digital pin 5
 * (12) LCD D5 pin to Arduino digital pin 4
 * (13) LCD D6 pin to Arduino digital pin 3
 * (14) LCD D7 pin to Arduino digital pin 2
 * (15) LCD A pin through a 220 ohm to 5V
 * (16) LCD K pin to GND

 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe
 modified 17 Dev 2018
 by jim.The.STEAM.Clown

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 */

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

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);


// define some values used by the panel and buttons
int lcd_key     = 0;
int adc_key_in  = 0;
#define btnRIGHT  0
#define btnUP     1
#define btnDOWN   2
#define btnLEFT   3
#define btnSELECT 4
#define btnNONE   5

// read the buttons
int read_LCD_buttons()
{
 adc_key_in = analogRead(0);      // read the value from the sensor 
 // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
 // we add approx 50 to those values and check to see if we are close
 if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result

 
 // For V1.1 use this threshold
 /*
 if (adc_key_in < 50)   return btnRIGHT;  
 if (adc_key_in < 250)  return btnUP; 
 if (adc_key_in < 450)  return btnDOWN; 
 if (adc_key_in < 650)  return btnLEFT; 
 if (adc_key_in < 850)  return btnSELECT;  
*/

 // For V1.0 comment the other threshold and use the one below:
/*
 if (adc_key_in < 50)   return btnRIGHT;  
 if (adc_key_in < 195)  return btnUP; 
 if (adc_key_in < 380)  return btnDOWN; 
 if (adc_key_in < 555)  return btnLEFT; 
 if (adc_key_in < 790)  return btnSELECT;   
*/

// For 5 button use this threshold
 if (adc_key_in < 50)   return btnNONE;  
 if (adc_key_in < 69)   return btnSELECT;  
 if (adc_key_in < 74)  return btnLEFT; 
 if (adc_key_in < 80)  return btnRIGHT; 
 if (adc_key_in < 86)  return btnUP; 
 if (adc_key_in < 94)  return btnDOWN;  

 return btnNONE;  // when all others fail, return this...
}

void setup()
{
 lcd.begin(16, 2);              // start the library
 lcd.setCursor(0,0);
 lcd.print("Push the buttons"); // print a simple message
}
 
void loop()
{
 lcd.setCursor(9,1);            // move cursor to second line "1" and 9 spaces over
 lcd.print(millis()/1000);      // display seconds elapsed since power-up


 lcd.setCursor(0,1);            // move to the begining of the second line
 lcd_key = read_LCD_buttons();  // read the buttons

 switch (lcd_key)               // depending on which button was pushed, we perform an action
 {
   case btnRIGHT:
     {
     lcd.print("RIGHT ");
     break;
     }
   case btnLEFT:
     {
     lcd.print("LEFT   ");
     break;
     }
   case btnUP:
     {
     lcd.print("UP    ");
     break;
     }
   case btnDOWN:
     {
     lcd.print("DOWN  ");
     break;
     }
   case btnSELECT:
     {
     lcd.print("SELECT");
     break;
     }
     case btnNONE:
     {
     lcd.print("NONE  ");
     break;
     }
 }

}