#include <ShiftIn.h>
#include <Adafruit_NeoPixel.h>
#define PIN            5
#define NUMPIXELS      40
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 Schalter_ID = 0;
int laenge_Input = 0;
void setup() {
  Serial.begin(9600);
  Pixels.begin();
  Pixels.show();
  // declare pins: pLoadPin, clockEnablePin, dataPin, clockPin
  shift.begin(8, 9, 11, 12);
}
void loop() {
  if (shift.update()) { // read in all values. returns true if any button has changed
    laenge_Input = shift.getDataWidth();
    Pixels.clear();
    for (Schalter_ID = 0; Schalter_ID < laenge_Input; Schalter_ID++) {
      if (shift.state(Schalter_ID) == 1) {
        LED_set(Schalter_ID, 0, 20, 0);
      }
      Pixels.show();
    }
  }
}
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);
  }
}