https://www.arduino.cc/en/reference/wire The functions index on the Wire library reference main page calls the function `SetClock()` but the correct case is `setClock()`. Reference: https://github.com/arduino/ArduinoCore-avr/blob/master/libraries/Wire/src/Wire.h#L56 Originally reported at: http://forum.arduino.cc/index.php?topic=558076.new#new