Arduino web serial port unavailable software#
Arduino web serial port unavailable code#

Keyboard K120 for Businessīus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubīus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubīus 010 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubīus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubīus 004 Device 002: ID 2341:0042 Arduino SA Mega 2560 R3 (CDC ACM)īus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root ls -l /dev/ttyACM0Ĭrw-rw- 1 root dialout 166, 0 Jun 11 22:05 id cosmicĮxception in thread 'cc.SerialBoardsLister' Īt (Platform.java:143)Īt .resolveDeviceAttachedTo(Platform.java:142)Īt cc.n(SerialBoardsLister.java:83)Īt (Timer.java:555)Īt (Timer.java:505)Īt this point the Tools->Port menu item is greyed out and the board is not selectable or loadable. Basic Optical Mouse v2.0īus 005 Device 002: ID 046d:c31c Logitech, Inc. CP1500 AVR UPSīus 005 Device 003: ID 045e:00cb Microsoft Corp. OpenJDK 64-Bit Server VM (build 25.45-b02, mixed lsusbīus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubīus 011 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubīus 009 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubīus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubīus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubīus 001 Device 004: ID 03f0:8811 Hewlett-Packardīus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubīus 005 Device 004: ID 0764:0501 Cyber Power System, Inc. OpenJDK Runtime Environment (build 1.8.0_45-b14) The workaround is to not plug an Arduino board into a USB port until after the first instance Arduino IDE is running in a login session.Įxample of a first time Arduino IDE run in a login java -version If no board is plugged into a USB port under the two use cases above then no JAVA runtime error is generated and the menu item Tools->Port is not greyed out, that is, the IDE is fully functional.Īfter the first time run of the Arduino IDE, with or without an Arduino board plugged in before starting the IDE, the IDE will subsequently run with an Arduino board plugged in before starting the IDE without problems. The key to the problem is an Arduino board being plugged into a USB port before starting the Arduino IDE and the instance of the Arduino IDE being the first instance (occurance) of a login session.

The first time run of the Arduino IDE after login when an Arduino board is plugged into a USB port before starting the IDE.

The first time run of the Arduino IDE after installation when an Arduino board is plugged into a USB port before starting the IDE, and,.

This problem always occurs in two specific use cases and does not matter whether running as root or user: In two specific use cases the Arduino IDE generates a JAVA runtime error and the Tools->Port menu item is greyed out so the board is not selectable or loadable.

This still depends on how the UART interface of the sensor works, though, and has the same issue where your data could be lost because you aren't listening to that device at that particular time.I can confirm this problem with arduino-1.6.4 on openSUSE 13.2. If you want to save pins, you could try a multiplexer for UART.

Arduino web serial port unavailable software#

But if you already have your sensors, why not try setting up a few of them with software serial ports and trying to talk to them?Įven more out there - if there's a sensor you really like, you can get an I2C to UART adapter. I think those approaches will save you from some software headaches later on. You can try looking for sensors that use different interfaces (SPI, I2C, or even just analog outputs).

That's not always feasible though, and you might have difficulty finding one that works well in the Arduino ecosystem. So what can you do to get around it? The obvious answer is get a microcontroller with more serial ports. It's message wouldn't be stored anywhere on the Arduino (unless you're currently listening to that software serial port). Depending on how your sensors work, this could be an issue, because the lack of an input buffer means that the sensor would basically be 'yelling into the void'. If you look into the Arduino software serial library, you'll see that there's this problem where you can only receive data on one software serial at a time. It's more complicated than that, but, for a basic understanding, it should be enough.

Arduino web serial port unavailable code#

When you use a software serial port, that does something called 'bit-banging', where the code now has to deal with the problem. I'm fairly certain that you're going to run into issues with multiple software serials.īasically, the way serial interfaces work is there's a portion inside the microcontroller that has some extra logic (input/output buffers, timing things, etc) that deal with a lot of the complexity.