[SOLVED]Problem during arduino Uno Sketch upload

Using Arduino Avrdude, stk500, Bootloader issues
#1

Hello makers,
I have arduino uno clone board. I used it since couple of year. I did plenty of projects using it till now.

Since two days I am unable to download programs on it. During investigation my observation is as below.

01, If I connect usb cable of uno into my laptop and immediately connect serial monitor then it connects. And it runs last program as I got all serial print messages, or blink of pin13.

02, If I disconnect serial monitor(not power) & try to reconnect serial monitor it didn't got connects afterwards.

Only way to reconnect is by following step-01as mentioned above.

03, if I connect usb of uno to laptop and immediately download new code then it got successfully downloaded and worked.

04, if I try to download another sketch(without power restart) then it didn't downloaded as uno didn't connects.
Again if I follow step03 then I am able to download any sketche.

Remark:- I tried pressing reset button just before download starts but it didn't worked aswell.

Summary:- arduino connects with PC within short period of time after power up. After few seconds of power up instance it refuse to connect.

Assumption:- as this behaviour is time dependent, I my assumption is :- any one capacitor of my board is faulty. But I don't know which one.
I assume its ftdi chip releted capacitor which holds tx pin of uno after certain time of power up the board.

Kindly suggest which part of base bord got damaged??

#2

Most clones do not use FTDI.

Could you take a few moments to Learn How To Use The Forum.
It will help you get the best out of the forum in the future.

  • Your OS and version can be valuable information, please include it along with extra security you are using.
  • Always list the version of the IDE you are using and the board version if applicable.
  • Use quote or add error messages as an attachment NOT a picture.
  • How to insert an image into your post. ( Thanks @Robin2 )
  • Add your sketch where applicable but please use CODE TAGS ( </> )
  • Add a SCHEMATIC were needed even if it is hand drawn
  • Add working links to any specific hardware as needed (NOT links to similar items)
  • Remember that the people trying to help cannot see your problem so give as much information as you can

COMMON ISSUES

  • Ensure you have FULLY inserted the USB cables.
  • Check you have a COMMON GROUND where required. ( Thanks @Perry)
  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.
  • Try other computers where possible.
  • Try other USB leads where possible.
  • You may not have the correct driver installed. CH340/341 or CP2102
  • There may be a problem with the board check or remove your wiring first.
  • Remove any items connected to pins 0 and 1.

COMPUTER RELATED

  • Close any other serial programs before opening the IDE.
  • Ensure you turn off any additional security / antivirus just to test.
  • There may be a problem with the PC try RESTARTING it.
  • You may be selecting the wrong COM port.
  • Avoid cloud/network based installations where possible OR ensure your Network/Cloud software is RUNNING.
  • Clear your browsers CACHE.
  • Close the IDE before using any other serial programs.
  • Preferably install IDE’s as ADMINISTRATOR or your OS equivalent

ARDUINO SPECIFIC BOARDS

  • CH340/341 based clones do not report useful information to the “get board info” button.
  • NANO (Old Types) some require you to use the OLD BOOTLOADER option.
  • NANO (ALL Types) See the specific sections lower in the forum.
  • NANO (NEW Types) Install your board CORE’s.
  • Unless using EXTERNAL PROGRAMMERS please leave the IDE selection at default “AVRISP mkII”.
  • Boards using a MICRO usb connector need a cable that is both DATA and CHARGE. Many are CHARGE ONLY.

CREATE editor install locations.

  • On macOs ~/Applications/ArduinoCreateAgent-1.1/ArduinoCreateAgent.app/Contents/MacOS/config.ini
  • On Linux ~/ArduinoCreateAgent-1.1/config.ini
  • On Windows C:\Users[your user]\AppData\Roaming\ArduinoCreateAgent-1.1

Performing the above actions may help resolve your problem without further help.
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Thanks to all those who helped and added to this list.
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1 Like
#3

Just a SWAG but it sounds like the laptop driver software got updated if it worked properly before.

#4

I don't think so. Because all my other bords are connecting fine.

#5

Thanks for pointing out.
I will take care next time.

#6

I have tried on anothervPC & it works. So it's driver problem.

Thanks.