/* String Case changes Examples of how to change the case of a String created 27 Jul 2010 modified 2 Apr 2012 by Tom Igoe This example code is in the public domain. http://www.arduino.cc/en/Tutorial/StringCaseChanges */ void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for native USB port only } // send an intro: Serial.println("\n\nString case changes:"); Serial.println(); } void loop() { // toUpperCase() changes all letters to upper case: String stringOne = ""; Serial.println(stringOne); stringOne.toUpperCase(); Serial.println(stringOne); // toLowerCase() changes all letters to lower case: String stringTwo = ""; Serial.println(stringTwo); stringTwo.toLowerCase(); Serial.println(stringTwo); // do nothing while true: while (true); }