Arduino Tutorial

By LiterallyTheOne

4: Serial Communication

Introduction

• Previous tutorial: LCD and Keypad
• This tutorial: Serial Communicaion

Serial Communication

• Send
• Recive
• One bit
• One of the most important concept in microcontrollers

Usecase

• Send data to:
  • Computer
  • Microcontroller
  • modules (e.g., Blutooth, GPS)

UART

• Universal Asynchronous Receiver-Transmitter
• The way Arduino handles serial Communication
• Needs two pins:
  • Recieve data (RX)
  • Transmit data (TX)

UART pins in Arduino

• RX: pin 0
• TX: pin 1

Baud rate

• Set baud rate correctly to have a communication
• Speed of data transfer
• Asynchronous
• Has a start and end bit

Serial Terminal on SimulIDE

• TX of Arduino -> RX of Serial Terminal
• RX of Arduino -> TX of Serial Terminal

Serial Hello World

• Set a baud rate and intitialize

Serial.begin(9600);

• Write on Serial Terminal

Serial.println("Hello World");

Full code

#include <Arduino.h>

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println("Hello World");
  delay(1000);
}

Output Hello World

Read from Serial Termianl

if (Serial.available())
{
    char ch = Serial.read();
    Serial.println(ch);
}

Output of reading from terminal

Read until new line

if (Serial.available())
{
    String result = Serial.readStringUntil('\n');
    Serial.println(result);
}

Output of read until new line

Built-in serial monitor in SimulIDE

• mega328/Open Serial Monitor/USart

Software Serial

• Hardware serial communication:
  • 0
  • 1
• If we want to use other pins for serial communication
  • We use Software Serial

Software Serial usage

• Include

#include <SoftwareSerial.h>

• Make a serial object

SoftwareSerial mySerial(10, 11); // RX, TX

Full code Software Serial

#include <Arduino.h>
#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

void setup()
{
  mySerial.begin(9600);
}

void loop()
{
  mySerial.println("Hello SoftwareSerial!");
  delay(1000);
}

Output of Software Serial

Two Arduinos

Link to the tutorial and materials