In today’s tutorial, I am going to show you 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. I followed your connections where I am using arduino mega. 3.3V is supplied using 2x AAA batteries. Using your codes and other code using serial2, I am unable to get a response. However, when using FTDI cable, I receive a responds when sending AT command. Seems to me software and hardware serial is not working. Please advise.

1. Arduino Soft Serial
2. Arduino Mega Software Serial Ports
3. Arduino Uno Softwareserial
4. Mega-software.tk
5. Mega 2560 Software
6. Arduino Mega Serial Pins

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. /intel-pentium-hd-graphics-driver.html. 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.

Arduino Soft Serial

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

Arduino Mega Software Serial Ports

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 Uno Softwareserial

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.

Mega-software.tk

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.

Mega 2560 Software

Arduino Mega Serial Pins

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