The Arduino Mega has three additional serial ports: Serial1 on pins 19 (RX) and 18 (TX), Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX). Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin(). You can use the Arduino environment's built-in serial monitor to communicate with an Arduino board. Thus, if you use these functions, you cannot also use pins 0 and 1 for digital input or output. It communicates on digital pins 0 (RX) and 1 (TX) as well as with the computer via USB. All Arduino boards have at least one serial port (also known as a UART or USART): Serial. Serial is used for communication between the Arduino board and a computer or other devices. Don't connect these pins directly to an RS232 serial port they operate at +/- 12V and can damage your Arduino board. This entry was posted in Tutorials and tagged Arduino, ATmega8U2, Serial on Januby Sudar.Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board). #Arduino mega serial port BluetoothThis is a neat trick and might be useful if you have to interface some serial device like a GPS or a Bluetooth module with your computer. I wrote a small sketch which was printing something in the Serial every few seconds and then when I opened the virtual COM port using screen, I was able to see its output. I didn’t had a serial device handy with me, so I used a another Arduino as a serial device to test this. You can connect to it using programs like screen or hyper terminal. In your computer the device will appear as a Virtual COM port. You should however note that the Rx pin (pin 0) goes to the Rx of the device and Tx pin (pin 1) goes to the Tx of the device and not the other way around. Now you can connect the serial device to the Arduino pins 0 and 1. This will hold the processor in RESET mode. To hold the processor in RESET mode, just connect the RESET pin (which is active-low) with the ground. If we hold the processor in RESET mode, then all its GPIO pins will me in tri-state, effectively removing it from the circuit and you can directly interface the serial to USB IC with your device. The serial to USB(TTL) IC (either FTDI FT232RL or ATmega8U2) is connected to Arduino pins 0 and 1. #Arduino mega serial port installIn your computer, you will have to install corresponding drivers and the device will appear as the virtual COM port. In pre-UNO boards this is handled by the FTDI FT232RL IC and in UNO it is handled by ATmega8U2 IC. So the Arduino team when they designed the board, placed another IC to channel this serial communication over USB. You can connect the microcontroller to the serial port in your computer (with appropriate logic level converters) and can interface with it.īut these days, most computers don’t have a serial port. The ATmega328 microcontroller used in the Arduino board supports UART TTL (5V) serial communication. How cool is that? □īefore I tell you how you can do it, let me explain about virtual COM ports and how Arduino uses them. You can use your Arduino board as a bridge to connect serial devices to the computer, without even writing a sketch. I recently found an interesting use of the many Arduino boards that I have.
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