What is the size of the buffer in serial communication with arduino uno? 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
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