#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <Servo.h>
LiquidCrystal_I2C lcd (0x27,3,4);

Servo servo;

const uint8_t ROWS = 4;
const uint8_t COLS = 3;
char keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { 'L', '0', 'S' }
};

uint8_t colPins[COLS] = {4, 3, 2}; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = {8, 7, 6, 5 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

const int pchar = 0xFF;
const int mchar = 0x20;

int i = 0;
const int Poti = A0;
int adc = 0;
int angel = 0;
int fsave = 0;
int fdelete = 0;
int graph = 0;
int val[] = {0,0,0,0,0,0,0,0,0,0};
int zahl = 0;

void setup() 
{
  lcd.init();
  lcd.backlight();
  servo.attach(9);
  servo.write(0);
}
void loop(){
char key = keypad.getKey();
  
if (key != NO_KEY)
{
switch(key)
{
case 'S':
                  
break;

case 'L':  

break;

default:
  i = key - '0';
break;
}}

  adc = analogRead(A0);
  angel = map(adc,0,1023,0,180);
  graph = map(adc,0,1023,0,COLS);
  barGraph(graph, COLS, 3, pchar, mchar);
  adc = analogRead(Poti);
  lcd.setCursor(0,0);
  lcd.print("Mem[");
  lcd.print(i);
  lcd.print("]: ");
  lcd.setCursor(0,1);
  lcd.print("adc: ");
  lcd.print(adc);    //gibt werte von 0-1023 in Binär / display.print(adc); gibt den wert von 0-1023
  lcd.print("      ");
  lcd.setCursor(0,2);
  lcd.print("angel: ");
  lcd.print(angel);
  lcd.print ("     ");
  if(fsave)

  {
    servo.write(angel);
    fsave = 0;
  }
  if(fdelete)
  {
    servo.write(0);
    fdelete = 0;
  }
}
void barGraph(int anzSeg, int maxCol, int row, int pchar, int mchar)
{
    int i = 0; 

    for(i = 0;i < maxCol; i++)
    {
        lcd.setCursor(i,row);
        if(i < anzSeg)lcd.write(pchar);
        else lcd.write(mchar);
    }
}