readBytes() read characters from a stream into a buffer. The function terminates if the determined length has been read, or it times out (see setTimeout()).

readBytes() returns the number of bytes placed in the buffer. A 0 means no valid data was found.

This function is part of the Stream class and is called by any class that inherits from it (Wire, Serial, etc).


stream.readBytes(buffer, length)


  • stream : an instance of a class that inherits from Stream.
  • buffer : the buffer to store the bytes in (char[] or byte[])
  • length : the number of bytes to read (int)


The number of bytes placed in the buffer

See also

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The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain

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