Arduino Interface - UART(Serial)

This tutorial is “Arduino Interface UART(Serial)”. The Universal Asynchronous Receiver-Transmitter (UART) is a fundamental component in microcontroller communication, enabling data exchange between devices. In the realm of Arduino, mastering UART opens doors to interfacing with a plethora of sensors, actuators, and other devices.

In this guide, we’ll delve into the basics of UART communication with Arduino. Whether you’re a hobbyist embarking on your first Arduino project or an experienced developer seeking a refresher, this tutorial aims to demystify UART and equip you with the knowledge to integrate it seamlessly into your projects.

Let’s embark on this journey to unravel the intricacies of UART communication with Arduino, from understanding the principles behind UART to implementing it in your own circuits and code.

Contents

1 Use cases
2 Print Hello World in Serial terminal
3 Print data in the Serial from user input
4 Analog Read Serial
5 Digital Read Serial
6 NEXT
- 6.1 Explore more

Use cases

The Arduino UART (Serial) interface offers a wide range of uses across various projects and applications.

Application	Description
Sensor Integration	Interface with various sensors like temperature sensors, IMUs, GPS modules for data collection.
Wireless Communication	Establish wireless links using Bluetooth, Wi-Fi, or Zigbee modules for remote control & IoT.
Display Output	Communicate with LCDs, OLEDs to present information in projects like digital clocks, weather stations.
Data Logging	Log data to external storage devices for long-term recording in environmental monitoring, tracking systems.
Human-Machine Interface	Communicate with external devices like keypads, RFID readers for user interaction in systems.
Control Interfaces	Control motors, relays, servo motors for robotics, automated systems, or interactive installations.
Debugging and Serial Communication	Use for debugging, real-time monitoring, and data transfer between Arduino and PC.
Interfacing with Other Devices	Communicate with other microcontrollers like Raspberry Pi, ESP8266, enabling collaborative projects.

Print Hello World in Serial terminal

Code

void setup() 
{
  Serial.begin(9600);
  while (! Serial); // Wait untilSerial is ready - Leonardo
  Serial.println("ArunEworld : Hello World");
}
 
void loop() 
{
 
}

Print data in the Serial from user input

Arduino Interface UART(Serial)

Code

//www.ArunEworld.com

void setup() 
{
  Serial.begin(9600);
  while (! Serial); // Wait untilSerial is ready - Leonardo
  Serial.println("ArunEworld Serial Monitor Example");
}
 
void loop() 
{
  if (Serial.available())
  {
    char ch = Serial.read();
      Serial.println(ch);
  }
}

Analog Read Serial

Circuit

Schematics

Code

/*
  AnalogReadSerial

  Reads an analog input on pin 0, prints the result to the Serial Monitor.
  Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu).
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/AnalogReadSerial
*/

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // print out the value you read:
  Serial.println(sensorValue);
  delay(1);        // delay in between reads for stability
}

Digital Read Serial

Circuit

Schematics

Code

/*
  DigitalReadSerial

  Reads a digital input on pin 2, prints the result to the Serial Monitor

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/DigitalReadSerial
*/

// digital pin 2 has a pushbutton attached to it. Give it a name:
int pushButton = 2;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  // make the pushbutton's pin an input:
  pinMode(pushButton, INPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input pin:
  int buttonState = digitalRead(pushButton);
  // print out the state of the button:
  Serial.println(buttonState);
  delay(1);        // delay in between reads for stability
}