Serial Monitor Arduino Not Working In Arch Linux

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Arduino Arch Linux

I had difficulty when I first used Arduino IDE on Arch Linux, before I used Arduino IDE on Ubuntu and everything running smoothly. But now, Serial Monitor Arduino Not Working in Arch.

I feel confused by this situation. Data from the microcontroller does not appear in the Serial Monitor.

It delayed my work while using arch linux.

Serial Monitor Testing Program Code

I tried with the Arduino blink example program that I modified as follows:


  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second

I opened the serial monitor and did not get Serial data as shown in the following image:

Serial Monitor Arduino Not Working In Arch Linux

After I searched for the cause and I found the solution. Maybe I better write in this article to be able to help you all.

Here is the solution.

Why Serial Monitor Not Working In Linux?

I find out in forums of why this is not working. And I found the problem in Arch Linux is in the Java version.

Here is the version that I am using:

I am using Arduino Version 1.8.12 and using Java version JDK 8. Then I double-check whether in my Arch Linux there is another java version. I checked using the terminal:

How to Fix It?

It turned out that on my computer there are two versions of java, Java 8 and Java 13. By default Java is Java 8. Then I set Java to Java 13, with the command:

After that, check again whether the java used has become Java 13? Use the following command:

Restart your Arduino IDE. Then I reopened Serial Monitor and Success. But for the Serial Monitor display is not as beautiful as in Java 8. But thankful this has been successful.

Serial Monitor Arduino Not Working In Arch Linux

Now I have fixed the Arduino Serial Monitor Not Working. Hopefully this article is useful. That’s all.

I hope this Article is useful.

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