1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15

char myChar = '\n'; // try with 'n' for a non control char

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

  if (isControl(myChar)) {  // tests if myChar is a control character
    Serial.println("The character is a control character");
  }
  else {
    Serial.println("The character is not a control character");
  }
}

void loop() {
}