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Arduino serial communication

Here I come with the new and very important topic that is arduino serial communication. So before go farther we should know something about what is serial communication? We know the term communication refer to the information shearing between two devices. It can be done by two method.

  1. Parallel communication:    Data or information send parallel pattern from sender to receiver. Let’s 8 bit parallel communication means 8 bit information reached from sender to receiver at once. Generally this type of communication done between small distances.

arduino serial communication

  1. Serial communication:   Data or information send serial pattern from sender to receiver. Let’s 8 bit serial communication means 8 bit information reached from sender to receiver serially one by one. Serial communication done between long distances.

arduino serial communication

Now I think, we know basic concept of Serial communication. Let’s come to our main topic that is arduino serial communication. For arduino serial communication, we have to clear some question first.

How we do arduino serial communication?

Which pins are responsible for arduino serial communication?

Answer of first question is we do arduino serial communication by UART port. UART stands for universal asynchronous receiver-transmitter. UART is a computer hardware device for asynchronous serial communication. The main advantage of UART is we can configure the bit pattern and transmission speed also.

Now answer of second question is pin numbers 0 and 1 are used for serial communication in arduino uno board. We can see RX (receive) and TX (transmit) are written over the board.

arduino serial communication

Project description:

To make easily understand the process, I select a simulation based project on protius software. Where I connect LCD with arduino board and virtual serial terminal. Now after writing proper arduino program, we can see whatever we write in virtual terminal. It will display in Lcd. It proved that whatever we send the data through virtual terminal. It will received TX and RX pin and display to LCD.

I think project description is clear to you now I show my circuit diagram which I made in protious software. If you need some knowledge on interfacing LCD with arduino. Please see my previous post on “ Interfacing LCD with arduino uno “.

arduino serial communication

Here I give you the complete embedded C code of my project arduino serial communication.

Embedded C Code
// Name : Arduino serial communication 
// Author : Subham Dutta
// Date : 29-01-18
// Website :
#include <LiquidCrystal.h> // initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup()
// set up the LCD’s number of columns and rows:
lcd.begin(16, 2);
// initialize both serial ports:
void loop() {
if (Serial.available()) {
unsigned int inByte =;

Hope this description clear your concept on arduino serial communication.

In bellow see the project video.

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Subham Dutta

Subham Dutta

Hi myself Subham Dutta, having 15+ years experience in filed of Engineering. I love to teach and try to build foundation of students. Try to make them imagine what they learn.

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