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I am building a project that I'd like to be able to communicate to the board both through an app on the PC and via Bluetooth with an Android smartphone. I also want the option to send a command from the Phone to the Arduino, then from the Arduino to the PC. Can I do this using only the one set of RX,TX pins? I also have an Arduino Mega2560 which from what I see has four different serial ports, but I'd rather not use it because I want this project to be as small as possible, and I also want the Mega to be my benchtest device. Can I simulate multiple serial ports through software? How could I control to which device the information will go?
Thanks in advance.
Sep 22, 2018 - Serial UART is one of the various ways an Arduino can communicate with other devices. This includes a host PC and using the Arduino serial monitor is. Can have multiple instances but only one instance can be active at one time. SoftwareSerial swSerial(2, 3); // RX, TX void setup() { // Start the. Dec 9, 2012 - Arduino Uno with Multiple Software Serial Devices. The Arduino Uno (ATmega328) has a single hardware serial connection. If more serial connections are needed, you must implement these in software. Luckily, there is a very easy to use library to implement software serial connections.
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. 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 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.