Jun 22, 2016 A problem we've encountered with Teensy 3.x involves 3rd party libraries with dependency on SoftwareSerial. No matter how many real hardware serial ports you have (Teensy has 3 available), you can't use.any. of them if your project depends on some library that requires a pointer or a C reference to an object of type 'SoftwareSerial'. This software is known as the Arduino IDE (Integrated Development Environment). Drivers must be installed in order to be able to program an Arduino from the Arduino IDE. This article shows how to download and install the Arduino IDE software and drivers on a Windows 10 computer. Downloading Arduino for Windows 10. The Arduino Uno (ATmega328) has a single hardware serial connection. If more serial connections are needed, you must implement these in software. Luckily, there is a very easy to use library to implement software serial connections. It is called SoftwareSerial.h and is included with the latest Arduino IDE. The following code demonstrates how to use this library to implement more than one software serial channel. This library is an implementation of a software UART (Universal Asynchronous Receiver Transmitter) for the Arduino Due's Atmel ATSAM3X8E micro-controller. Using this library you can have up to nine software serial ports on the Arduino DUE, in addition to the hardware serial ports already available on the Atmel ATSAM3X8E micro-controller, namely objects Serial, Serial1, Serial2 and Serial3.
Software Serial Example
Arduino and Genuino boards have built in support for serial communication on pins 0 and 1, but what if you need more serial ports? The SoftwareSerial Library has been developed to allow serial communication to take place on the other digital pins of your boards, using software to replicate the functionality of the hardwired RX and TX lines. This can be extremely helpful when the need arises to communicate with two serial enabled devices, or to talk with just one device while leaving the main serial port open for debugging purpose.
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In the example below, digital pins 10 and 11 on your Arduino or Genuino boards are used as virtual RX and TX serial lines. The virtual RX pin is set up to listen for anything coming in on via the main serial line, and to then echo that data out the virtual TX line. Conversely, anything received on the virtual RX is sent out over the hardware TX.
Hardware Required
- Arduino or Genuino Board
Circuit
There is no circuit for this example. Make sure that your Arduino or Genuino board is attached to your computer via USB to enable serial communication through the serial monitor window of the Arduino Software (IDE).
image developed using Fritzing. For more circuit examples, see the Fritzing project page
Schematics
Arduino Uno Software Serial Pins
image developed using Fritzing. For more circuit examples, see the Fritzing project page
Code
See also
- TwoPortReceive – Two serial ports that receive data switching from one to the other one when a special character is received.
- MultiSerialMega - Use two of the serial ports available on the Arduino and Genuino Mega.
- Serial Call Response - Send multiple vairables using a call-and-response (handshaking) method.
- Serial Call Response ASCII - Send multiple variables using a call-and-response (handshaking) method, and ASCII-encode the values before sending.
Softwareserial Uno
Last revision 2018/05/17 by SM