/*

   Send data throuhg a NeoPixel stripe

   at the end of the neopix stript you can connect the Arduino Nano as a receiver for the data string.

   21.11.2021 chris_

*/
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif

#define PIN            6

#define NUMPIXELS      12

// NUMPIXEL increase by 1 because last pixel is the data transmission message
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS + 1, PIN, NEO_GRB + NEO_KHZ800);


void setup()
{
  pixels.begin();
}


char Message[]="c-hater ist der Beste ! \n";



void sendBit(uint8_t bitValue)
{
  const uint8_t dataPos = NUMPIXELS;
  uint32_t data;
  boolean val = (bitValue & 1) != 0;
  if ( val)  data = 0xFFFFFF;
  else data = 0;
  pixels.setPixelColor(NUMPIXELS, data);
  pixels.show();
  //Serial.print(val);Serial.print(" ");
  delay(50);
}

void sendByte(uint8_t value)
{
  //Serial.println();
  // startbit
  sendBit(1);
  sendBit(value >> 0);
  sendBit(value >> 1);
  sendBit(value >> 2);
  sendBit(value >> 3);
  sendBit(value >> 4);
  sendBit(value >> 5);
  sendBit(value >> 6);
  sendBit(value >> 7);
  // stop bits
  sendBit(0);
  sendBit(0);
  sendBit(0);
  sendBit(0);
  sendBit(0);
  sendBit(0);
  sendBit(0);
  sendBit(0);
}

void loop()
{
  static uint8_t ledPos = 0;
  static uint8_t idx = 0;
  static uint8_t counter = 0;
  for (int n = 0; n < NUMPIXELS; n++)
  {
    if (ledPos == n)    pixels.setPixelColor(n, pixels.Color(0, 150, 0));
    else                pixels.setPixelColor(n, pixels.Color(0, 0, 0));
  }

  sendByte(Message[counter++]);
  if(counter>=sizeof(Message))counter=0;

  
  // NeoPixel Lauflicht
  ledPos++;
  if (ledPos >= NUMPIXELS)ledPos = 0;

}