The Arduino hardware has built-in support for serial communication on pins 0 and 1. 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. So, Let’s learn about using SoftwareSerial in Arduino.

Add a 5V buzzer and connect the positive to pin 8 of arduino and the ground pin to ground of arduino. In this example, we will use a tag with serial number “119 38 185 95” as the right tag. You can edit this serial number in code below. It is all translated into a form that we mere humans can see. Every number is translated into readable characters, and readable characters have to be converted into numbers. For example, the number 165 is the characters 1 (49), 6 (54) and 5(53). When you enter that number you are sending those three individual characters. This part only checks the serial. receivedCommand = Serial. //adding the two numbers Serial. Print (' The result is: '); //text Serial. Developing Serial Terminal for Arduino in C#. JCS-900 DRO with Arduino and LCD. Serial.available returns the number of characters (i.e. Bytes of data) which have arrived in the serial buffer and that are ready to be read. returns the first (oldest) character in the buffer and removes that byte of data from the buffer.

This is how fast the connection can read and write bits on the wire. (Needless to say, your broadband connection can transfer data a lot faster than an Arduino!) OK so Serial.begin sets up the Arduino with the transfer rate we want, in this case 9600 bits per second. Lets move on to the next line.

The SoftwareSerial library allows serial communication on other digital I/O pins. It replicates the serial communication functionality using the software. 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.

Different Functions of SoftwareSerial Library


It is used to create an instance of SoftwareSerial Object. You can create Multiple SoftwareSerial objects, however only one can be active at a given moment. You need to call SoftwareSerial.begin() to enable the communication.

Syntax:SoftwareSerial(rxPin, txPin, inverse_logic)


rxPin: the pin on which to receive serial data
txPin: the pin on which to transmit serial data
inverse_logic: It is used to invert the sense of incoming bits. If set, SoftwareSerial treats a LOW (0 volts on the pin, normally) on the Rx pin as a 1-bit (the idle state) and a HIGH (5 volts on the pin, normally) as a 0-bit. It also affects the way that it writes to the Tx pin. The default value is false.

Warning: You should not connect devices that output serial data outside the range that the Arduino can handle, normally 0V to 5V, for a board running at 5V, and 0V to 3.3V for a board running at 3.3V.


It begins the SoftwareSerial on the given baud rate.


Parameters: speed: the baud rate (long)


Return a character that was received on the RX pin of the software serial port. Note that only one SoftwareSerialinstance can receive incoming data at a time. Returns -1 if no data is available.;


Prints data to the transmit pin of the software serial port as raw bytes. Works the same as the Serial.write() function


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Arduino Serial Read Number


Prints data to the transmit pin of the software serial port. Works the same as the Serial.print() function. Same way println() function also works.


Arduino Serial Read Number


Get the number of bytes (characters) available for reading from a software serial port. This is data that’s which arrived and stored in the serial receive buffer.



This is an example for use of SoftwareSerial Library in Arduino and other compatible boards.
In code, integrated <SoftwareSerial.h> Library. mySerial is constructed on pin numbers 10 and 11. In setup, Begin at 9600 baud rate. We are writing ‘123’ on mySerial in the loop function.

Arduino To Arduino Serial Communication

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