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

char myChar = '\t';  // try with 'a' for a non space char

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

  if (isWhitespace(myChar)) {  // tests if myChar is a space character
    Serial.println("The character is a space or tab");
  } else {
    Serial.println("The character is not a space or tab");
  }
}

void loop() {
}