Conversion

LONG to STRING

Conversion d’un entier de type long non signé en chaîne de caractère :

Unsigned Long peut stocker un nombre entier allant de 0 à 4 294 967 295. Le convertir en chaîne facilite son affichage et/ou sa transmission via une communication entre deux Arduinos.

 String long2string(unsigned long longint) {
 char buf[10];
 int len = 0;
 String temp;
 String left;
 String right;
 ltoa(longint, buf, 10);
 temp = buf;
 len = temp.length();
 switch (len) {
 case 1:
 temp = "000 00" + temp;
 break;
 case 2:
 temp = "000 0" + temp;
 break;
 case 3:
 temp = "000 " + temp;
 break;
 case 4:
 temp = "00" + temp;
 left = temp.substring(0, 3);
 right = temp.substring(3, 6);
 temp = left + " " + right;
 break;
 case 5:
 temp = "0" + temp;
 left = temp.substring(0, 3);
 right = temp.substring(3, 6);
 temp = left + " " + right;
 break;
 case 6:
 left = temp.substring(0, 3);
 right = temp.substring(3, 6);
 temp = left + " " + right;
 break;
 default:
 temp = "000 000";
 break;
 }
 return temp;
}

Un code exemple peut être téléchargé ici

STRING to LONG

  String inString = "10:20";
  int nHeure, nSec;

  int FirstIndex = inString.indexOf(':');
  String firstValue = inString.substring(0, FirstIndex);
  String secondValue = inString.substring(FirstIndex + 1);
  
  Serial.println(firstValue);
  nHeure = firstValue.toInt();
  Serial.println(nHeure);
  Serial.println(secondValue);
  nSec = secondValue.toInt();
  Serial.println(nSec);

https://www.arduino.cc/en/Reference/StringToInt

Références sur les types de variables :

http://www.mon-club-elec.fr/pmwiki_reference_arduino/pmwiki.php?n=Main.UnsignedLong