Reads incoming serial data. inherits from the Stream utility class.


Parameter Values

  • Serial: serial port object. See the list of available serial ports for each board on the Serial main page.

Return Values

  • The first byte of incoming serial data available (or -1 if no data is available). Data type: int.

Example Code

int incomingByte = 0; // for incoming serial data void setup() { Serial.begin(9600); // opens serial port, sets data rate to 9600 bps } void loop() { // send data only when you receive data: if (Serial.available() > 0) { // read the incoming byte: incomingByte =; // say what you got: Serial.print("I received: "); Serial.println(incomingByte, DEC); } }

See Also

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