• Serial Port Cable
• Arduino Leonardo Hardware Serial Ports
• Arduino Software Serial Example
• Ps/2 Port
• Arduino Two Hardware Serial Ports

Hello friends, I hope you all are fine and having fun. In today’s tutorial, I am going to show you

• The one to use depends on whether you are using a hardware or software serial port. It is important to note that these changes are at the Arduino core level. This means that every serial port used in all your projects are effected by this change.
• 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.

How to use Arduino Software Serial. In my previous tutorial, we have had a look at How to use Arduino Serial Write and How to use Arduino Serial Read. In both of these tutorials, we have done the hardware Serial Communication. But we all know that Arduino has just one Serial Port placed at pins 0 and 1. So, if you are having two or more serial modules, then there’s a difficulty in adding two modules because we just have one serial port. So, in such cases there’s a need to add one more serial port and that serial port can be created at any two pins of Arduino and that serial port is called software serial.

When working with ESP32 WiFi/Bluetooth MCU under Arduino SDK for ESP32, you will notice that Serial work just fine. But Serial1 and Serial2 do not. ESP32 has 3 hardware UARTs that can be mapped to almost any pin. But, Serial1 and Serial2 will not work. In case of ESP32 this just has to be done in a slightly different way. Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board). Don’t connect these pins directly to an RS232 serial port; they operate at +/- 12V and can damage your Arduino board. If you have problems on Serial communication with Arduino in C#, this post is perfect for you!!! These days, I'm learning serial port communication and want to write a simple demo on my LattePanda. LattePanda is a Win10 single board computer, it integrated Arduino Compatible Processor, so I can run. Send Serial Data to Host Using Arduino Hardware: In this model, the Arduino hardware sends data to your computer over the serial port 0 (USB port) of the Arduino hardware. This model is configured to run in Normal mode. In this mode, the model is deployed on the Arduino hardware.

Software Serial is also named as Virtual Serial Port. It’s really very comfy if you are working on serial modules. IF you ask me I have never used hardware serial port because pin # 0 and pin # 1 are also used for uploading code and debugging the code via Arduino Serial Monitor. So, I always connect my Serial modules via software serial and then check their output on Serial Monitor. So, let’s get started with How to use Arduino Software Serial:

How to use Arduino Software Serial ?

• I am gonna use Proteus software for testing the codes. So you can download the Proteus Simulation by clicking the below button:

Download Simulation & Code

• First of all, let me tell you where you can find Examples of Software Serial.
• Arduino has a Library of Software Serial in it. If you can’t find its library then you should download the Software Serial Library.
• Now copy and paste the below code in your Arduino:

• In the above code, we have first included the Arduino Software Serial Library using #include<SoftwareSerial.h>.
• After that, I have created the SoftSerial object and its parameters are SoftSerial(RX, TX), so in the above code pin # 2 has become RX of our Arduino Software Serial and pin # 3 become TX.
• Now our SoftSerial object is ready so next thing we have done is SoftSerial.begin(9600), here we have started our software serial and the baud rate set is 9600.
• Now design a small circuit in Proteus, you will need Arduino Library for Proteus to use Arduino in Proteus, as shown in below figure:

• Now get our Arduino Hex File and upload it in your Proteus.
• Now run your Proteus Simulation and you will get something as shown in below figure:

• So, its printed there that one is hardware serial and second is software serial and you can see the software serial is connected to Pin # 2 and Pin # 3.
• Now when you write something in the Hardware Serial, it will also get printed in the Software Serial, that’s the code which we have added in the loop() section.
• The below videos will give you better idea of how it’s working.

So, that’s all for today, I hope you have enjoyed this Arduino Software Serial example. Download the Simulation from above button and try to design it on your own. Take care and have fun !!! 🙂

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Category: ArduinoBy Syed Zain Nasir7 Comments

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:

101

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. '

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

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

the code should be something like this :

Serial Port Cable

Arduino Leonardo Hardware Serial Ports

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

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

It makes no difference for Serial class.

Mathieu Borderé

Arduino Software Serial Example

Ps/2 Port

Arduino Two Hardware Serial Ports

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