char * ftoa(char * outstr, double val, byte precision){
 char temp[16];
 byte i;
 byte widthp=0;

 // compute the rounding factor and fractional multiplier
 double roundingFactor = 0.5;
 unsigned long mult = 1;
 for (i = 0; i < precision; i++)
 {
   roundingFactor /= 10.0;
   mult *= 10;
 }
 
 temp[0]='\0';
 outstr[0]='\0';

 if(val < 0.0){
   strcpy(outstr,"-\0");
   val = -val;
 }

 val += roundingFactor;

 strcat(outstr, itoa(int(val),temp,10));  //prints the int part
 if( precision > 0) {
   strcat(outstr, ".\0"); // print the decimal point
   unsigned long frac;
   unsigned long mult = 1;
   byte padding = precision -1;
   while(precision--)
     mult *=10;

   if(val >= 0)
     frac = (val - int(val)) * mult;
   else
     frac = (int(val)- val ) * mult;
   unsigned long frac1 = frac;

   while(frac1 /= 10)
     padding--;

   while(padding--)
     strcat(outstr,"0\0");

   strcat(outstr,itoa(frac,temp,10));
 }

 // generate space padding
 if ((widthp != 0)&&(widthp >= strlen(outstr))){
   byte J=0;
   J = widthp - strlen(outstr);
   
   for (i=0; i< J; i++) {
     temp[i] = ' ';
   }

   temp[i++] = '\0';
   strcat(temp,outstr);
   strcpy(outstr,temp);
 }
 return outstr;
}