Serial.write()

[Serial]

Description

Writes binary data to the serial port. This data is sent as a byte or series of bytes; to send the characters representing the digits of a number use the print() function instead.

Syntax

Serial.write(val)
Serial.write(str)
Serial.write(buf, len)

Parameters

• val: a value to send as a single byte
• str: a string to send as a series of bytes
• buf: an array to send as a series of bytes
• len: the length of the buffer

Returns

byte: write() will return the number of bytes written, though reading that number is optional

Example

void setup(){
  Serial.begin(9600);
}
 
void loop(){
  Serial.write(45); // send a byte with the value 45
 
   int bytesSent = Serial.write("hello"); // send the string "hello" and 
                                          // return the length of the string.
}

See also

• if (Serial)
• available()
• begin()
• end()
• find()
• findUntil()
• flush()
• parseFloat()
• parseInt()
• peek()
• print()
• println()
• read()
• readBytes()
• readBytesUntil()
• setTimeout()
• serialEvent()

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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.