In order to monitor the status of transmitter and receiver Arduino, virtual terminals have been used.Virtual Tx pin of Arduino 1 transmit data to real buffer of receiver Arduino 2 and this data is written on virtual Tx pin of receiver Arduino 2 which is than shown on virtual terminal named as “Received Data”.Connect virtual pin Rx of first Arduino board with pin Tx of second Arduino board.Connect virtual pin Tx of first Arduino board with pin Rx of second Arduino board.SoftwareSerial UART0(2, 3) // RX, TX Connection Diagram Between Two Arduino Boards via Serial Pinsįollowing figure shows a connection diagram between two Arduino boards using digital pins to simulate a UART communication port using a pre-built library.Ĭonsider we are using digital pin 11 and pin 10 as Tx and Rx for both Arduino boards. Hence, this line sets pin2 as a Rx pin and pin3 as a Tx pin for UART0. First argument is a receiver pin(RX) and the second argument is a transmit pin (TX). As an argument, we pass the name of digital pins which we want to use for serial communication. For example, this line creates an object with the name of UART0. To use this library, first include the header file of software serial library using this line: #include Īfter that create an instant or object of the software serial library with a name of your own choice. By using SoftwareSerial library, we can communicate with multiple devices or sensors over the UART interface. Arduino SoftwareSerial LibraryĪrduino IDE has a built-in software serial library which allows use to perform serial communication using other digital input-output pins. However, all the functions which are usually available in hardware serial ports can be simulated and utilized using software serial ports. It is very easy to simulate serial UART communication but it should be remembered that it does not have any dedicated hardware and it will utilize the resources of already given Arduino Board like memory and execution time. In this case, a specially implemented software library is used to simulate UART communication behavior on other digital input output pins of Arduino. But, maximum Ardiuno compatible boards do not have multiple serial ports. This USB connection transfers data to the Arduino IDE serial monitor using Rx and Tx pins.Īlthough Arduino Mega has up to four serial communication ports. The other important reason to use the uart software library is that the UART port of Arduino is used by the onboard USB connection.

Arduino serial library