Introduction
UART stands for Universal Asynchronous Receiver/Transmitter. Unlike I²C and SPI, it isn't a protocol but physical circuitry found inside the microcontroller. It is used for communication between an Arduino board and a computer, or with other devices such as a GPS module or RFID module.
In this guide, learn about serial communication and various serial commands used in the Arduino IDE.
Complete this guide to understand the basics involved in serial communication.
In this guide, learn about serial communication and various serial commands used in the Arduino IDE.
Complete this guide to understand the basics involved in serial communication.
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void setup() { // Start serial communication for Uno R3 Serial.begin(9600); //Start serial communication for Arduino Mega at Serial port 3 //Serial3.begin(9600); }
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void setup() { Serial.begin(9600); // opens serial port, sets data rate to 9600 bps } void loop() { // reply only when you receive data: if (Serial.available() > 0) { // Do something: } }
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int inByte = 0; // for incoming serial data void setup() { Serial.begin(9600); // opens serial port, sets data rate to 9600 bps } void loop() { // send data only when you receive data: if (Serial.available() > 0) { // read the incoming byte: inByte = Serial.read(); } }
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Serial.readBytes(buffer, length);
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Serial.readBytesUntil(character, buffer, length);
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void setup() { // Start serial communication for Uno R3 Serial.begin(9600); //Start serial communication for Arduino Mega at Serial port 3 //Serial3.begin(9600); } void loop() { Serial.print("Hello World!"); Serial.print("17"); Serial.print("3.14159265359"); Serial.print(25); // Outputs the ASCII string "25" to the serial port Serial.print(2.7345); // Outputs "2.73" }
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void setup() { // Start serial communication for Uno R3 Serial.begin(9600); //Start serial communication for Arduino Mega at Serial port 3 //Serial3.begin(9600); } void loop() { Serial.println("Hello World!"); Serial.println("17"); Serial.println("3.14159265359"); Serial.println(25); // Outputs the ASCII string "25" to the serial port Serial.println(2.7345); // Outputs "2.73" }
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Serial.write(0x48); // H will write 0100 1000 Serial.write(0x45); // E will write 0100 0101 Serial.write(0x4C); // L will write 0100 1100 Serial.write(0x4C); // L will write 0100 1100 Serial.write(0x4F); // O will write 0100 1111