Arduino Reference - Write

Arduino

Serial

## write()

#### 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)

Arduino Mega also supports: Serial1, Serial2, Serial3 (in place of Serial)

#### 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.
}
[Get Code]

#### See also

- read()
- print()
- println()

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