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1. Arduino Software Serial Example
2. Arduino Hardware Serial Port
3. Arduino Due Hardware Serial Ports
4. Parallel Port
5. Arduino Mega Hardware Serial Ports

I couldn't find examples in my Arduino books and with Google that used the hardware serial port of the Uno R3 to connect peripherals. Edit 1: Let me add the following: I don't want to use the Serial monitor (of the Arduino IDE) and the peripheral (Bluetooth module) at the same time. I don't expect that it can be used at the same time. This can be extremely helpful when the need arises to communicate with two serial enabled devices, or to talk with just one device while leaving the main serial port open for debugging purpose. In the example below, digital pins 10 and 11 on your Arduino or Genuino boards are used as virtual RX and TX serial lines. How to Connect Arduino to a PC Through the Serial Port: To do that I have used a computer with Ubuntu 12.04 and the program language C, but if you want to used Windows the code works too, only have to change the port used to conect with arduino, but this is explain in the next step. How Serial is Created Now. Luckily, Atmel & Arduino did a really great job with structuring SERCOMs so you can create and assign new ones. You can find the actual code that is used to create the 'Serial' SERCOM in variants.cpp. (for uno/mega) The TX and RX lines of the hardware serial are connected to pins 0 and 1 (for most Arduino boards, at least). These are connected (through a resistor) to the TX and RX lines of an on-board USB-serial adapter. The USB D+ and D- lines from that are connected to the USB port.

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Arduino Software Serial Example

I'm using an Arduino Micro. When I use 'Serial.write' etc with the Arduino's IDE serial monitor everything is working fine.

However when I try to read or send data via 'Serial1', I get nothing. 'Serial1' is suppose to use 0 and 1 RX,TX respectively.

Do I need to connect these pins through a USB converter or are they connected on the boards USB converter?

Here is the code:

9 Answers

The only serial port connected to the USB that the serial monitor can read from is Serial.

Serial1, Serial2, and Serial3 are all logic level serial and will not show up on the Arduino serial monitor.

If you want to see the output from these on your computer,it will require extra hardware.

Serial is the only serial port connected to USB. So serial monitor can access only that port. If you need Serial1 or Serial2 to be accessed by serial monitor, then you should use 'USB to TTL Serial Cable' and connect this to RX and TX pins of the arduino's Serial1 port.Please visit link for USB to TTL Serial Cable, enter link description here

'Serial1' in Arduino Micro is Physically connected to TX and RX pins (TTL), 'Serial' is just a 'virtual port' which you can read using Arduino IDE's Serial Monitor, thats why arduino micro is little different from another such as nano or pro mini.

if you use Serial and Serial1 you can aproach this advantage and upload code using USB and make a connection thought bluetooth (using HC06 connected to physical pins) without disconnect the USB cable and powered both devices (micro and bluetooth).

If you can't upload code to your micro sometimes, press micro's reset button then release it and press upload button in Arduino IDE's.'virtual port' sometimes needs to restart and connect using USB.

This is from Arduino's Documentation Website:

'..Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using the ATmega32U4 hardware serial capability. Note that on the Micro, the Serial class refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use the Serial1 class. '

Arduino Hardware Serial Port

You said it right, Serial1 is the RX and TX pin, while Serial is a virtual interface between computer and Arduino. I have used the TX and RX pins for a wireless module, and if you NEED to use Serial1, it would have to occupy pins 0 and 1, and switch from DLINE to UART on your board.

Open serial monitor with the icon placed in right corner of Arduino IDE. It will be available if you connect the Arduino with PC.

When you open the Arduino IDE write this code block

Select the arduino 9600 port and write something. If you get your written text your arduino is ready from serial comminicate.

Make sure you go to tool/board: and select Arduino Mega (or other board with multiply serial ports) or it won't work, because the Uno only has one Serial communication port (aka The TX and RX pins on pins on 1 and 0)! Write 1,2 or 3 depending on what TX and RX pins you are using on the Board. The mega has a whole set of extra pins for Serial 1,2 and 3, for example:

Arduino Uno (etc):

Arduino Mega:

or

or

Arduino Due Hardware Serial Ports

You have to define Serial1 by using SoftwareSerial class from SoftwareSerial library ,Google and download the library :

the code should be something like this :

Serial1 is the wrong class for pin 0 and pin 1. You should use Serial class.

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Do I need to connect these pins through a USB converter or are they connected on the boards USB converter?

Parallel Port

It makes no difference for Serial class.

Arduino Mega Hardware Serial Ports

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Following on from the FTDI + ESP8266 post, if you do not have a FTDI serial adaptor you can use an Arduino. Here is how to set up the Arduino to talk to the ESP8266.

I an using a 5V Arduino Nano which of course is 5V. The Esp8266 is a 3.3v device and so I am using a voltage divider to bring the Arduinos 5V down to 3.3v. If you are using a 3.3v Arduino then you do not need the voltage divider.

The wiring is very similar to the FTDI.
Arduino pin 3 to voltage divider and then to ESP8266 RX
Arduino pin 2 to ESP8266 TX
Arduino GND to ESP8266 GND
Pull CH_PD HIGH with a 10K resistor to +3.3v
+3.3V to vcc

You only need the voltage divider on the Arduino TX pin. The 5V Arduino will read 3.3v as HIGH so you can connect the ESP8266 TX pin directly to the Arduino RX pin.

Make sure the ESP8266 has enough current. If it does not it may keep resetting and may not broadcast a signal.

Arduinos cannot supply enough current and you should use a separate power supply. While experimenting I use a bread board power supply.

I am using a simple serial in, serial out sketch.

Once everything is setup, open the serial monitor and cycle the power on the ESP8266 and you should receive the welcome message.

You can now interrogate the ESP8266 and change the settings. For more on talking to the ESP8266 see FTDI + ESP8266