Returns the next byte (character) of incoming serial data without removing it from the internal serial buffer. That is, successive calls to peek() will return the same character, as will the next call to read().

peek() inherits from the Stream utility class.


All boards:

  • Serial.peek()
  • Serial1.peek()

86Duino One specific:

  • Serial2.peek()
  • Serial3.peek()
  • Serial485.peek()

86Duino EduCake specific:

  • Serial2.peek()
  • Serial3.peek()
  • Serial232.peek()




the first byte of incoming serial data available (or -1 if no data is available) – int

See also

Language Reference Home

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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