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Arduino Troubleshooting

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Dec 16, 2019 With Apple TV, you can mirror the entire display of your Mac to your TV, or use your TV as a separate display. To turn on AirPlay, follow these steps: Make sure that your TV is turned on. Choose in the menu bar, then choose your Apple TV. If an AirPlay passcode appears on your TV screen, enter the passcode on your Mac. On the Mac, if you have an old version of the FTDI drivers, you may need to remove them and reinstall the latest version. See this forum thread for directions (thanks to gck). What if I get a gnu. Io.PortInUseException when uploading code or using the serial monitor (on the Mac)? Mac OS OnScreen Control - version 3.76. OnScreen Control is an application used to manage a single monitor or a group of monitor with useful features such as Monitor Control, My Display Presets and Screen Split. OnScreen Control displays all connected LG monitor information. This software is compatible with LG monitors only. Rebuild Desktop-Restart with Command+Option+Shift keys depressed.Hold keys until message appears, click OK. Zap PRAM-Start with cold boot with Command+Option+P+R keys depressed.Hold key until 2 chimes. Make sure key caps is not depressed. Check desktop pattern, memory, network, Appletalk, etc. Due to the new multiple monitor handling introduced with Mac OS 10.9 (Mavericks) it is not possible to span e.g. The project windows or the MixConsole across multiple screens anymore per default. Is your MacBook not working? Is your Mac not turning on? We run through how to troubleshoot a Mac that has stopped working, helping you find out what's wrong with your Mac and how to fix it!

What if my board doesn't turn on (the green power LED doesn't light up)?

If you're using a USB board, make sure that the jumper (little plastic piece near the USB plug) is on the correct pins. If you're powering the board with an external power supply (plugged into the power plug), the jumper should be on the two pins closest to the power plug. If you're powering the board through the USB, the jumper should be on the two pins closest to the USB plug. This picture shows the arrangment for powering the board from the USB port.

(thanks to mrbbp for report and picture)

What do to if I get the following error when launching arduino.exe on Windows?

Arduino has encountered a problem and needs to close.

You'll need to launch Arduino using the run.bat file. Please be patient, the Arduino IDE may take some time to open.

Why won't Arduino run on old versions of Mac OS X?

If you get an error like this:

you probably need to upgrade to Max OS X 10.3.9 or later. Older versions have incompatible versions of some system libraries.

Thanks to Gabe462 for the report.

What do I do if I get the following error when launching Arduino?

Uncaught exception in main method: java.lang.UnsatisfiedLinkError: Native Library /Users/anu/Desktop/arduino-0002/librxtxSerial.jnilib already loaded in another classloader

You probably have an old version of the communications library lying around. Search for comm.jar or jcl.jar in /System/Library/Frameworks/JavaVM.framework/ or in directories in your CLASSPATH or PATH environment variables. (reported by Anurag Sehgal)

What about this error?

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Java Virtual Machine Launcher: Could not find the main class. Program will exit.

Make sure that you correctly extracted the contents of the Arduino .zip file - in particular that the lib directory is directly inside of the Arduino directory and contains the file pde.jar.

What can I do about cygwin conflicts on Windows?

If you already have cygwin installed on your machine, you might get an error like this when you try to compile a sketch in Arduino:

6 [main] ? (3512) C:Devarduino-0006toolsavrbinavr-gcc.exe: *** fatal error - C:Devarduino-0006toolsavrbinavr-gcc.exe: *** system shared memory version mismatch detected - 0x75BE0084/0x75BE009C.

This problem is probably due to using incompatible versions of the cygwin DLL.

Search for cygwin1.dll using the Windows Start->Find/Search facility and delete all but the most recent version. The most recent version *should* reside in x:cygwinbin, where 'x' is the drive on which you have installed the cygwin distribution. Rebooting is also suggested if you are unable to find another cygwin DLL.

If so, first make sure that you don't have cygwin running when you use Arduino. If that doesn't help, you can try deleting cygwin1.dll from the Arduino directory and replacing it with the cygwin1.dll from your existing cygwin install (probably in c:cygwinbin).

Thanks to karlcswanson for the suggestion.

Why doesn't my board show in the Tools Serial Port menu ?

If you're using a USB Arduino board, make sure you installed the FTDI drivers (see the Howto for directions). If you're using a USB-to-Serial adapter with a serial board, make sure you installed its drivers.

Make sure that the board is plugged in: the serial port menu refreshes whenever you open the Tools menu, so if you just unplugged the board, it won't be in the menu.

Check that you're not running any programs that scan all serial ports, like PDA sync applications, Bluetooth-USB drivers (e.g. BlueSoleil), virtual daemon tools, etc.

On Windows, the COM port assigned to the board may be too high. From zeveland:

'One little note if you aren't able to export and your USB board is trying to use a high COM port number: try changing the FTDI chip's COM port assignment to a lower one.

'I had a bunch of virtual COM ports set up for Bluetooth so the board was set to use COM17. The IDE wasn't able to find the board so I deleted the other virtual ports in Control Panel (on XP) and moved the FTDI's assignment down to COM2. Make sure to set Arduino to use the new port and good luck.'

On the Mac, if you have an old version of the FTDI drivers, you may need to remove them and reinstall the latest version. See this forum thread for directions (thanks to gck).

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Why I can't upload my programs to the Arduino board?

There are a few things that could be wrong.

  • First make sure your board is on (the green LED is on) and connected to the computer (if it's not, see 'what if my board doesn't turn on' above).
  • Then, check that the proper port is selected in the 'Tools Serial Port' menu (if your port doesn't appear, restart the IDE with the board connected to the computer).
  • Make sure there's a bootloader burned on the Atmega8 on your Arduino board. To check, connect an LED to pin 13 and reset the board. The LED should blink. If it doesn't, see the Bootloader page for instructions on burning a bootloader to the board.
  • Be sure that you are resetting the board a couple of seconds before uploading.
  • However, on some computers, you may need to press the reset button on the board after you hit the upload button in the Arduino environment. Try different intervals of time between the two, up to 10 seconds or more.
  • Disconnect digital pins 0 and 1 while uploading (they can connected and used after the code has been uploaded).
  • If you get this error: [VP 1] Device is not responding correctly. try uploading again (i.e. reset the board and press the download button a second time).
  • Check that you're not running any programs that scan all serial ports, like PDA sync applications, Bluetooth-USB drivers (e.g. BlueSoleil), virtual daemon tools, etc.
  • Make sure you don't have firewall software that blocks access to the serial port (e.g. ZoneAlarm).
  • You may need to quit Processing, PD, vvvv, etc. if you're using them to read data over the USB or serial connection to the Arduino board.
  • If you have a really ancient Arduino board, you may need to change the baud rate at which sketches are uploaded to 9600 (from the normal 19200). You will have to change the speed in the preferences file directly. See the preferences page for instructions on finding the file. Look for the file in your computer and change the serial.download_rate property to match the one in your board. If you have such a board, it's recommended that you burn the latest bootloader (which works at 19200 baud). This can be done with the 'Tools Burn Bootloader menu item.

What if I get this error when uploading code or using the serial monitor (on the Mac)?

You need to run the macosx_setup.command in the Arduino directory, and then restart your computer. Arduino 0004 includes a modified version of this script that all users need to run (even those who ran the one that came with Arduino 0003). You may also need to delete the contents of the /var/spool/uucp directory.

I'm having trouble with the FTDI USB drivers.

Try installing the latest drivers from FTDI or contacting their support at support1@ftdichip.com.

Mac Troubleshooting Pdf

Why doesn't my sketch start when I'm powering the board with an external power supply?

Because the RX pin is unconnected, the bootloader on the board may be seeing garbage data coming in, meaning that it never times out and starts your sketch. Try tying the RX pin to ground with a 10K resistor (or connecting it to the TX pin).

Why doesn't my sketch start when I power up or reset the Arduino board?

Most likely because you are sending serial data to the board when it firsts turns on. During the first few seconds, the bootloader (a program pre-burned onto the chip on the board) listens for the computer to send it a new sketch to be uploaded to the board. After a few seconds without communication, the bootloader will time out and start the sketch that's already on the board. If you continue to send data to the bootloader, it will never time out and your sketch will never start. You'll either need to find a way to stop serial data from arriving for the first few seconds when the board powers (e.g. by enabling the chip that sends the data from within your setup() function) or burn your sketch onto the board with an external programmer, replacing the bootloader.

Why does my sketch appear to upload successfully but not do anything?

You have selected the wrong item from the Tools > Microcontroller menu. Make sure the selected microcontroller corresponds to the one on your board (either ATmega8 or ATmega168) - the name will be written on the largest chip on the board.

Alternatively, the sketch may be too big for the board. When uploading your sketch, Arduino 0004 checks if it's too big for the ATmega8, but it bases its calculation on a 1 Kb bootloader. You may have a older bootloader that takes up 2 Kb of the 8 Kb of program space (flash) on the ATmega8 instead of the 1 Kb used by the current bootloader. If yours is bigger, only part of the sketch will be uploaded, but the software won't know, and your board will continually reset, pause, reset.

If you have access to an AVR-ISP or parallel port programmer, you can burn the latest version of the bootloader to your board with the Tools Burn Bootloader menu item. Otherwise, you can tell the Arduino environment the amount of space available for sketches by editing the upload.maximum_size variable in your preferences file (see: instructions on finding the file). Change 7168 to 6144, and the environment should correctly warn you when your sketch is too big.

How can I reduce the size of my sketch?

The ATmega168 chip on the Arduino board is cheap, but it has only 16 Kb of program code, which isn't very much (and 2 Kb is used by the bootloader).

If you're using floating point, try to rewrite your code with integer math, which should save you about 2 Kb. Delete any #include statements at the top of your sketch for libraries that you're not using.

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Otherwise, see if you can make your program shorter.

We're always working to reduce the size of the Arduino core to leave more room for your sketches.

Why don't I get a PWM (an analog output) when I call analogWrite() on pins other than 3, 5, 6, 9, 10, or 11?

The microcontroller on the Arduino board (the ATmega168) only supports PWM/analogWrite() on certain pins. Calling analogWrite() on any other pins will give high (5 volts) for values greater than 128 and low (0 volts) for values less than 128. (Older Arduino boards with an ATmega8 only support PWM output on pins 9, 10, and 11.)

Guide HomeThe text of the Arduino getting started guide is licensed under aCreative Commons Attribution-ShareAlike 3.0 License. Code samples in the guide are released into the public domain. Get library folder mac.