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Problem: can't print to the serial monitor, it appears that the serial monitor disconnects itself after uploading a program.

I'm brand new to arduino, and I'm trying to upload a basic program to print to the serial monitor.

I use an arduino uno and my OS is Ubuntu. I am connecting the arduino to my PC via USB. Using Arduino Studio Release 0.0.5 experimental build 0.0.5-16058

(I am able to communicate via the digital output pins, tested by making a simple circuit to make the led light blink)

Here is the program:

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    Serial.print("test");
    delay(500);
}

Here is the result of the build, look at the last line and it says the serial monitor was disconnected? Why would this happen automatically?

[2/2/2016 8:51:26 PM] - Start Building
[2/2/2016 8:51:26 PM] - CPP File Created [/tmp/build1454471486915/test.cpp]
[2/2/2016 8:51:26 PM] - test.cpp compiled
[2/2/2016 8:51:26 PM] - CDC.cpp compiled
[2/2/2016 8:51:27 PM] - HID.cpp compiled
[2/2/2016 8:51:27 PM] - HardwareSerial.cpp compiled
[2/2/2016 8:51:27 PM] - HardwareSerial0.cpp compiled
[2/2/2016 8:51:27 PM] - HardwareSerial1.cpp compiled
[2/2/2016 8:51:27 PM] - HardwareSerial2.cpp compiled
[2/2/2016 8:51:27 PM] - HardwareSerial3.cpp compiled
[2/2/2016 8:51:27 PM] - IPAddress.cpp compiled
[2/2/2016 8:51:27 PM] - Print.cpp compiled
[2/2/2016 8:51:27 PM] - Stream.cpp compiled
[2/2/2016 8:51:27 PM] - Tone.cpp compiled
[2/2/2016 8:51:27 PM] - USBCore.cpp compiled
[2/2/2016 8:51:27 PM] - WInterrupts.c compiled
[2/2/2016 8:51:27 PM] - WMath.cpp compiled
[2/2/2016 8:51:27 PM] - WString.cpp compiled
[2/2/2016 8:51:27 PM] - abi.cpp compiled
[2/2/2016 8:51:27 PM] - hooks.c compiled
[2/2/2016 8:51:27 PM] - main.cpp compiled
[2/2/2016 8:51:27 PM] - new.cpp compiled
[2/2/2016 8:51:28 PM] - wiring.c compiled
[2/2/2016 8:51:28 PM] - wiring_analog.c compiled
[2/2/2016 8:51:28 PM] - wiring_digital.c compiled
[2/2/2016 8:51:28 PM] - wiring_pulse.c compiled
[2/2/2016 8:51:28 PM] - wiring_shift.c compiled
[2/2/2016 8:51:28 PM] - CDC.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - HID.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - HardwareSerial.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - HardwareSerial0.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - HardwareSerial1.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - HardwareSerial2.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - HardwareSerial3.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - IPAddress.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - Print.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - Stream.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - Tone.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - USBCore.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - WInterrupts.c.o linked to core.a
[2/2/2016 8:51:28 PM] - WMath.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - WString.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - abi.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - hooks.c.o linked to core.a
[2/2/2016 8:51:28 PM] - main.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - new.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - test.cpp.o linked to core.a
[2/2/2016 8:51:28 PM] - test.ino linked to core.a
[2/2/2016 8:51:28 PM] - wiring.c.o linked to core.a
[2/2/2016 8:51:28 PM] - wiring_analog.c.o linked to core.a
[2/2/2016 8:51:28 PM] - wiring_digital.c.o linked to core.a
[2/2/2016 8:51:28 PM] - wiring_pulse.c.o linked to core.a
[2/2/2016 8:51:28 PM] - wiring_shift.c.o linked to core.a
[2/2/2016 8:51:28 PM] - test.cpp.elf linked to core.a
[2/2/2016 8:51:28 PM] - test EEPROM
[2/2/2016 8:51:28 PM] - test.hex builded
[2/2/2016 8:51:28 PM] - Uploading...
[2/2/2016 8:51:30 PM] - Uploaded
[2/2/2016 8:51:30 PM] - [arduino ide - serial monitor] Serial monitor connected to /dev/ttyACM0
[2/2/2016 8:51:36 PM] - [arduino ide - serial monitor] Serial monitor disconnected from /dev/ttyACM0
Improve this question
3
  • Are you using the Arduino IDE? If so, what version? If not, what are you using? – Nick Gammon♦ Feb 3 '16 at 4:44
  • Yes, ArduinoStudio Release 0.0.5 experimental build 0.0.5-16058 – James Wierzba Feb 3 '16 at 4:50
  • Does the serial monitor disconnect when you hold open the monitor and after that hold the reset button? – Avamander Feb 3 '16 at 20:08
2

I'm not sure why your IDE is doing that, but the official Arduino IDE from Arduino.cc works on Ubuntu and does not have that issue. Download from Arduino Software download page.

Improve this answer
4
  • I thought arduino studio was the official IDE, I'll download it and try it when I get home. Thank you for the suggestion – James Wierzba Feb 3 '16 at 14:53
  • @JamesWierzba "Arduino Studio" is from Arduino.org, whereas this answer links to the standard IDE produced by Arduino.cc. Neither is more official than the other; the original Arduino company split into two factions and are now offering competing products and software. – CharlieHanson Feb 3 '16 at 18:16
  • I edited my answer to clarify that I was referring to the version from Arduino.cc. Arduino.cc has a forum where you can ask questions like that. Arduino.org does not appear to have a forum (as far as I can see). – Nick Gammon♦ Feb 3 '16 at 19:40
  • I downloaded the Arduino IDE you suggested and printing to the serial monitor now works. Thanks – James Wierzba Feb 4 '16 at 14:48

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