☝️Do not unzip the downloaded library, leave it as is. In the Arduino IDE, navigate to Sketch Include Library Add.ZIP Library. At the top of the drop down list, select the option to 'Add.ZIP Library'. Return to the Sketch Include Library menu. You should now see the library at the bottom of the drop-down menu. Arduino SPI Library Commands. SPISettings mySPISettings(speed, dataOrder, dataMode) This can be used to define a SPI device interaction in your Arduino code, and is the system that allows you to change the way you interact with devices on the fly, by having preset definitions for speed, bit order and SPI Mode using the configuration values above.

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SoftwareSerial Library

The Arduino hardware has built-in support for serial communication on pins 0 and 1 (which also goes to the computer via the USB connection). The native serial support happens via a piece of hardware (built into the chip) called a UART. This hardware allows the Atmega chip to receive serial communication even while working on other tasks, as long as there room in the 64 byte serial buffer.

The SoftwareSerial library has been developed to allow serial communication on other digital pins of the Arduino, using software to replicate the functionality (hence the name 'SoftwareSerial'). It is possible to have multiple software serial ports with speeds up to 115200 bps. A parameter enables inverted signaling for devices which require that protocol.

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The version of SoftwareSerial included in 1.0 and later is based on the NewSoftSerial library by Mikal Hart.

Limitations

The library has the following known limitations:

If using multiple software serial ports, only one can receive data at a time.
Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

Example

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2,3);
voidsetup()
{
Serial.begin(57600);
Serial.println('Goodnight moon!');
// set the data rate for the SoftwareSerial port
mySerial.begin(4800);
mySerial.println('Hello, world?');
}
voidloop()// run over and over
{
if(mySerial.available())
Serial.write(mySerial.read());
if(Serial.available())
mySerial.write(Serial.read());
}

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Functions

SoftwareSerial()
available()
begin()
isListening()
overflow()
read()
print()
println()
listen()
write()

Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under aCreative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.