TOPIC MERGED.
Could you take a few moments to Learn and Use The Forum
It will help you get the best out of the forum in the future.
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Your OS and version can be valuable information, please include it along with extra security you are using.
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Always list the version of the IDE you are using and the board version if applicable.
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Use quote or add error messages as an attachment NOT a picture.
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How to insert an image into your post. ( Thanks @sterretje )
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Add your sketch where applicable but please use CODE TAGS ( </> )
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Add a SCHEMATIC were needed even if it is hand drawn
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Add working links to any specific hardware as needed (NOT links to similar items)
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Remember that the people trying to help cannot see your problem so give as much information as you can
COMMON ISSUES
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Ensure you have FULLY inserted the USB cables.
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Check you have a COMMON GROUND where required. ( Thanks @Perry)
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Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.
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Try other computers where possible.
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Try other USB leads where possible.
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You may not have the correct driver installed. CH340/341 or CP2102 or FT232 VCP Drivers - FTDI
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There may be a problem with the board check or remove your wiring first.
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Remove any items connected to pins 0 and 1.
COMPUTER RELATED
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Close any other serial programs before opening the IDE.
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Ensure you turn off any additional security / antivirus just to test.
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There may be a problem with the PC try RESTARTING it.
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You may be selecting the wrong COM port.
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Avoid cloud/network based installations where possible OR ensure your Network/Cloud software is RUNNING.
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Clear your browsers CACHE.
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Close the IDE before using any other serial programs.
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Preferably install IDE’s as ADMINISTRATOR or your OS equivalent
ARDUINO SPECIFIC BOARDS
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CH340/341 based clones do not report useful information to the “get board info” button.
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NANO (Old Types) some require you to use the OLD BOOTLOADER option.
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NANO (ALL Types) See the specific sections lower in the forum.
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NANO (NEW Types) Install your board CORE’s.
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Unless using EXTERNAL PROGRAMMERS please leave the IDE selection at default “AVRISP mkII”.
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Boards using a MICRO usb connector need a cable that is both DATA and CHARGE. Many are CHARGE ONLY.
CREATE editor install locations.
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On macOs ~/Applications/ArduinoCreateAgent-1.1/ArduinoCreateAgent.app/Contents/MacOS/config.ini
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On Linux ~/ArduinoCreateAgent-1.1/config.ini
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On Windows C:\Users[your user]\AppData\Roaming\ArduinoCreateAgent-1.1
Performing the above actions may help resolve your problem without further help.
Language problem ?
Try a language closer to your native language:
Thanks to all those who helped and added to this list.