as it is in the question, i need to know what is the size of the biggest string that i can send using the serial port to the arduino.
Thank you

  • You may check the sources shipped with the Arduino IDE. – Thomas S. Apr 4 '15 at 16:35
  • The size of the buffer and the size of the biggest string you can send are not necessarily related (if they are, that's really lazy programming on someone's part) – Chris Stratton Apr 6 '15 at 16:24

That would be 64 bytes, providing the buffer is fully empty. See https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/HardwareSerial.h#L42-L43

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