#include <ShiftIn.h>
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
#define PIN            6
#define NUMPIXELS      18
Adafruit_NeoPixel Pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int LED_Ausgabe[8][4] = //Belegung Feld - LED
{
  {0, 1, 6, 7}, //A3
  {1, 2, 7, 8}, //A4
  {2, 3, 8, 9}, //A5
  {4, 5, 12, 13}, //B1
  {5, 6, 13, 14}, //B2
  {6, 7, 14, 15}, //B3
  {7, 8, 15, 16}, //B4
  {8, 9, 16, 17} //B5;
};
// Init ShiftIn instance with a single chip
ShiftIn<1> shift;

int x = 0;
int b = 0;
int j = 0;
int i = 0;
int lang = 0;
char Belegung[8];
void setup() {
  Serial.begin(9600);
  Pixels.begin();
  Pixels.show();
  // declare pins: pLoadPin, clockEnablePin, dataPin, clockPin
  shift.begin(8, 9, 11, 12);
}

void displayValues() {
  lang = shift.getDataWidth();
  // print out all 8 buttons
  Serial.print("Schalterstatus:");
  for (i = 0; i < shift.getDataWidth(); i++) {
    Serial.print( shift.state(i) );     // get state of button i
    Belegung[i] = shift.state(i);
  }
  Serial.println();
}


void loop() {
  if (shift.update()) { // Lese Schieberegister aus
    displayValues();
    for (b = 0; b < 8; b++) {
    }
    Serial.println();
    Serial.print("Anzahl der Eingänge:");
    Serial.print(lang, DEC); // drucke Länge der Belegung
    Serial.println();
    for (x = 0; x < lang; x++) {
      switch (Belegung[x]) {
        case 0:
          Serial.print("Aus |"); // drucke Status
          LED_set(x, 0, 0, 0);
          delay(50);
          break;
        case 1:
          Serial.print("An |"); // drucke Status
          LED_set(x, 0, 20, 0);
          delay(50);
          break;
      }
    }
    Pixels.show();
    Serial.println();
  }
}

void LED_set(uint8_t i, uint8_t r, uint8_t g, uint8_t b) {
  int j;

  for (j = 0; j < 4; j++) {
    Pixels.setPixelColor(LED_Ausgabe[i][j], r, g, b);
  }
}