1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14

char myChar = 'A';  // try with 'é' for a non ASCII char

void setup() {
  Serial.begin(9600);

  if (isAscii(myChar)) {  // tests if myChar is an ASCII character
    Serial.println("The character is ASCII");
  } else {
    Serial.println("The character is not ASCII");
  }
}

void loop() {
}