Arduino boards such as the Uno, MEGA2560 and Due all have a serial port that connects to the USB device port on the board. This port allows sketches to be loaded to the board using a USB cable. Code in a sketch can use the same USB / serial port to communicate with the PC by using the Arduino IDE Serial Monitor window, or a Processing application for example. The USB port appears as a virtual COM port on the PC.
Hello everybody, I'm having problem communicating with the MEGA 2560 through Serial 1,2 and 3: the connection through USB via Serial 0 works perfectly but when I try to send data with Serial3 (pins 14 and 15) the computer recieve weird datas. Apologies if this a relatively simple question, but I am rather new to Arduino's and cannot seem to find any concise information on the topic. This is my XBee, mounted on a shield and placed onto a MEGA 2560. I want to leave Serial for USB debugging and use the Serial1 for XBee communication. In case you need higher communication speeds using the Arduino Due, see also my post: How To Use The Native USB Of The Arduino Due For High-Speed Communication; The additional three serial ports on the Arduino Due and Arduino Mega 2560 run only reliably up to 115200 baud. A baud rate of 230400 is possible but you have to deal with random data loss.
This article shows how to use Arduino serial ports when additional serial ports are needed for a project.
Arduino Serial Ports Available
The serial port for programming the Arduino mentioned above is a hardware serial port. The microcontroller on the Arduino board has a hardware serial port built-in, so that after the port has been initialized by software, a byte sent to the port will be sent out serially by the hardware.
The Arduino Uno has only one hardware serial port because the microcontroller used on the Uno has only one built-in serial port. The Arduino MEGA 2560 and Arduino Due both have 3 extra hardware serial ports.
Serial Port Technical Details
The hardware serial ports referred to here are UART (Universal Asynchronous Receiver Transmitter) ports. They may be referred to as USART (Universal Synchronous Asynchronous Receiver Transmitter) ports in the microcontroller documentation if they are configurable in both synchronous and asynchronous modes.
Arduino Mega 2560 Usb DriverArduino Uno Serial Port![]()
This image shows the only serial port available on the Arduino Uno highlighted in red. The port connects through a USB chip to the USB device port.
Arduino MEGA 2560 and Due
Both the MEGA 2560 and Due have 4 serial ports in total. One that connects through a USB port chip to the USB device port on the board and three extra serial ports that connect to pins on one of the pin headers of the board.
Arduino Due Serial Ports
Read claymore. Pins 0 and 1 of the Due and MEGA connect serial port 0 through to the USB device port so that these Arduino boards are compatible with the pin numbering of the Uno and therefore with Arduino shields.
The extra serial ports are ports 1 to 3 with each port having a transmit and receive pin.
Download the last airbender game. It is important to be aware that the MEGA 2560 serial port pins use 5V voltage levels, but the Due uses 3.3V voltage levels.
How to Use Additional Arduino Serial Ports
An extra serial port can be used on an Arduino Uno, but must be simulated in software by using the SoftwareSerial library.
Arduino Uno
The following code is taken from the article on serial communications with the GT-511C3 fingerprint scanner which connects the fingerprint scanner to a software serial port on an Arduino Uno.
To use the software serial port, first the header file for the software serial library must be included.
Next create the software serial port, selecting the Arduino pins to use for receive (RX) and transmit (TX). Here pin 8 has been set as the receive pin and pin 7 as the transmit pin.
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The software serial port had been given the name gtSerial which will be used in the sketch to refer to this serial port.
The port can now be checked for incoming data.
If data is available, it can be read from the port.
Data bytes can also be sent on the port.
How to Use Additional Serial Ports on the Arduino MEGA 2560 and Due
The additional hardware ports on the Arduino MEGA 2560 and Due can be used in the same way as the main USB serial port is used in sketches, only changing the name of the port. The USB serial port, or serial port 0 is referred to as Serial in sketches. To use serial port 1, the name changes to Serial1. Serial ports 2 and 3 are referred to as Serial2 and Serial3.
This sketch shows serial port 3 being used which transmits on pin 14 of the MEGA or Due and receives on pin 15.
The additional serial ports are immediately available in the sketch without having to include any libraries.
Serial port 3 must first be initialized to the desired baud rate.
The port can be checked for incoming data.
If a byte has arrived on the serial port, it can be read.
A byte can be written to the serial port.
Arduino Serial Port ResourcesArduino Website References for Software and HardwareArduino Mega 2560 Manual Pdf
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