//Sample using LiquidCrystal library
#include <LiquidCrystal.h>
#include <Servo.h>
Servo myservo;  // create servo object to control a servo 

/*******************************************************
Tento program otestuje Merkurino 01 s potenciometrem a modelářské servo
Ladislav Vohralik 2014, MerkurRobot.cz
********************************************************/
// select the pins used on the LCD panel
LiquidCrystal lcd(13, 12, 8, 7, 4, 2);
// define some values used by the panel and buttons
int lcd_key = 0;
int adc_key_in = 0;
int val;    // proměnná pro hodnotu serva 
int pot;    // proměnná pro hodnotu potenciometru 
int pot1;    // proměnná pro hodnotu potenciometru 
int potpin = 2;  // analog pin used to connect the potentiometer

#define btnRIGHT 0
#define btnUP 1
#define btnDOWN 2
#define btnLEFT 3
#define btnENTER 4
#define btnESC 5
#define btnNONE 6
// read the buttons
int read_LCD_buttons()
{
adc_key_in = analogRead(0); // přečti klávesnici na A0
//lcd.setCursor(12,1);lcd.print(adc_key_in); lcd.print("   ");
// 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
// pro Merkurino 01 plati tyto hodnoty:
if (adc_key_in < 40) return btnESC;
if (adc_key_in < 110) return btnLEFT;
if (adc_key_in < 300) return btnDOWN;
if (adc_key_in < 450) return btnUP;
if (adc_key_in < 700) return btnRIGHT;
if (adc_key_in < 850) return btnENTER;

return btnNONE; // when all others fail, return this...
}
void setup()
{
    Serial.begin(9600);
  pinMode(A1, OUTPUT);
  myservo.attach(A1);  // attaches the servo on pin 9 to the servo object
lcd.begin(16, 2); // start the library
lcd.setCursor(0,0);
lcd.print("Stiskni tlacitko"); // print a simple message
}
void loop() //začátek nekonečné smyčky
{
lcd.setCursor(8,1); // 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
  val = adc_key_in;
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 

switch (lcd_key) // depending on which button was pushed, we perform an action
{
case btnRIGHT:
{
lcd.print("vpravo  ");
  myservo.write(val);                  // sets the servo position according to the scaled value 

break;
}
case btnLEFT:
{
lcd.print("vlevo   ");
  myservo.write(val);                  // sets the servo position according to the scaled value 

break;
}
case btnUP:
{
lcd.print("nahoru     ");
  myservo.write(val);                  // sets the servo position according to the scaled value 

break;
}
case btnDOWN:
{
lcd.print("dolu   ");
  myservo.write(val);                  // sets the servo position according to the scaled value 
break;
}
case btnENTER:
{
lcd.print("potvrd ");
  myservo.write(val);                  // sets the servo position according to the scaled value 
break;
}
case btnESC:
{
lcd.print("zpet    ");
  myservo.write(val);                  // sets the servo position according to the scaled value 
break;
}
case btnNONE:
{
lcd.print("nic   ");
  pot = analogRead(potpin); // přečti potenciometr na A2
  pot = map(pot, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  myservo.write(pot);                  // sets the servo position according to the scaled value 
  if ( pot!= pot1 ){    // uložení stávající hodnoty potenciometru
    pot1 = pot;         // aby se posílala pouze změna (pootočení)
    Serial.println(pot);
  }
break;
}
}
}