/* CODE and DECODE DEC to BIN value 
*  Save space to use 8 position ON/OFF in dec value 0-255
*  in arduino EEPROM
*/

void setup() {
  Serial.begin(9600);
  Serial.println( "Begin" );
  
}

unsigned decNum = 20;

void loop() {

  for (int pos=1; pos<=8; pos++){
    Serial.print( decNum );
    Serial.print( " ");
    Serial.print("SET 1 ");
    Serial.print(" to ");
    Serial.print(pos);
    Serial.print(" pos  DECVAL:");
    decNum = setBoolValueToDec(decNum, pos, 1 );
    Serial.println(decNum);

  }
  //set 0/1 to position in present DECNUM and return new DECNUM
  
  
  delay(3000);
  
}


// Set value 0/1 to position and return DEC 0-255 for save to memory 
unsigned int setBoolValueToDec(int inDecNum, int pos, bool val ){
  
  String myStr, newStr; 
  long  binValue = dec2bin(inDecNum);  
  myStr = String(binValue);
  //fillout short string to 8 position
  while(myStr.length() < 8){ 
    myStr="0"+myStr;
  }
  Serial.print(myStr);
  Serial.print(" - ");

  for (int i=7;i>=0;i--){
    if (8-pos == i){
      newStr = val + newStr;
    }else{
      newStr = myStr.charAt(i) + newStr;  
    } 
  }

  Serial.print(newStr);
  Serial.print(" - ");

  //int dec_ = 0;
  //dec_ = (int) newStr.toInt();
  //return bin2dec(dec_);  
  //int getDecimalValue(bits){


}

int getDecimalValue(bits){
  int ret = 0;
  int base = 1;
  for(int i = 7; i >= 0; i--){
	  ret += bits[i] * base;
	  base = base * 2;
  }
  return ret;
}

//vrati hodnotu z binarni pozice
// 255 - 11111111 read from right to left
bool getValueFromDec(int decNum, byte pos){
  String myStr, valRes;     
  //String binValue = String(decNum, BIN);
  long  binValue = dec2bin(decNum); 
  myStr = String(binValue);
  int strLen = myStr.length();
  int charPos = strLen-pos;
  valRes = myStr.charAt(charPos);
  if (valRes.toInt() == 1)
    return true;   
  return false;
}

//decimal to binary
long dec2bin (int dec){
  int reminder;
  String bin;
  while (dec) {
    reminder = dec % 2;
    dec = dec / 2;
    bin = String(reminder) + bin;
  }
  return bin.toInt();
}




//binary to DEC
long bin2dec(long binary) {
  long number = binary;
  long decimalVal = 0;
  long baseVal = 1;
  long  tempVal = number;
  long previousDigit;

  while (tempVal) {
    //Converts  Binary to Decimal
    previousDigit = tempVal % 10;
    tempVal = tempVal  / 10;
    decimalVal += previousDigit * baseVal;
    baseVal = baseVal * 2;
  }
  //Returns the Decimal number
  return decimalVal;
}