Arduino xor verificação
String xorChecksum(String s) {
byte b = s.charAt(0);
for (int i=1; i<s.length(); i++) {
b = b ^ s.charAt(i);
}
String checksum = String(b, HEX);
if (checksum.length() ==1) checksum = "0" + checksum;
return checksum;
}
Keerthan Chand