Arduino Uno R3 is not showing up under ports in device manager couldn't find other devices\unknown devices option in device manager either.
I'm using Arduino Uno R3
Arduino IDE 2.2.1
Windows 10 version 22 H2
Are you getting any errors in the IDE Output window when you start the IDE?
Also, did you install the AVR cores?
https://docs.arduino.cc/software/ide-v1/tutorials/getting-started/cores/arduino-avr
Was it ever shown before?
Have you rounded up the usual suspects? (Restart the computer, the Arduino, change the USB cable, use a different USB port…)
Is it a clone, or an original?
i can see all avr arduino boards, but i don't see arduino com 1 or 3 under port.
When i tried basic blink program i received the error as shown in picture.
This is my first time connecting this Arduino to computer, and yes i changed the usb and reset Arduino but no use, i tried with different system where it doesn't even show port number unlike in in these pictures.
Did you install the CH340 driver? You need it for the Uno R3.
1 Like
Does COM1 or COM3 disappear when you disconnect the board?
What is the serial-to-usb converter on your board? It's the chip closest to the USB port.
You're using IDE 2.x but posted in the IDE 1.x category. However, as your topic fits better in Avrdude, stk500, Bootloader issues, it has been moved there.
it says those drivers were pre-installed.
If they don't disappear when you disconnect the Uno R3, they are not the Uno R3.
Expand and check the last two entries in below screenshot (for yellow exclamation marks); I think it's the last one but not sure.
That is an ordinary USB cable; nothing 'super' or 'debug' in there 
Make sure that the cable is properly inserted; does the ON-LED comes on when you connect the board. If this is a brand new board, does the L-LED flash?
Did you ever manage to upload to this board?
Can you take a photo of of the area around the USB port (including the serial-to-usb converter) and post it here.
this was resolved, after i removed the small cap inserted to one of arduino pins that's making issue from being detected.
Please what cap are talking about because I’m facing the same issue with arduino r3
Hi @stevore5353535.
"Cap" is a slang sometimes used to refer to capacitors (an electrical component).
A capacitor might be the cause of the issue, but only if you connected that electrical component to your Arduino. You would remember doing so, so if you don't remember doing that then the issue is surely caused by something else.
A couple of issues were mentioned here:
- "Arduino Uno R3 is not showing up under ports in device manager"
- "i received the error ("
... not in sync ...") as shown in picture."
So that we can be sure we understand the issue you are having, please provide a detailed description in a reply here on the forum thread, including:
- What did you do?
- What were the results you expected from doing that thing?
- What were the results you observed that did not match your expectations?
Make sure to include the full and exact text of any error or warning messages you might have encountered.
Okay …. I did not connect a capacitor
I bought a new arduino uni R3… tried using it . It was showing on other devices
on my device manger .. I installed the CH340 driver …. It’s still the same
What is the warning / error in Device Manager?
The serial-to-usb IC (the little square IC closest to the USB port) on the board does not look like a CH340; it looks like a 16U2.
Note:
It does not look like your USB cable is fully inserted in the USB connector on the board.
Yes is 16U2 not CH340 ... So do I need to download another driver for that?
The standard driver for the 16U2 should be installed when you installed the IDE.
Please answer beliw question. I might not be able to help but it can shine some light on the issue.
Further see the note in my previous reply.
This is the error it's showing:
FQBN: arduino:avr:uno
Using board 'uno' from platform in folder: C:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6
Using core 'arduino' from platform in folder: C:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6
Detecting libraries used...
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\variants\standard" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp" -o nul
Alternatives for Wire.h: [Wire@1.0]
ResolveLibrary(Wire.h)
-> candidates: [Wire@1.0]
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\variants\standard" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp" -o nul
Alternatives for LiquidCrystal_I2C.h: [LiquidCrystal I2C@1.1.2]
ResolveLibrary(LiquidCrystal_I2C.h)
-> candidates: [LiquidCrystal I2C@1.1.2]
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\variants\standard" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src" "-IC:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp" -o nul
Using cached library dependencies for file: C:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src\Wire.cpp
Using cached library dependencies for file: C:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src\utility\twi.c
Using cached library dependencies for file: C:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C\LiquidCrystal_I2C.cpp
Generating function prototypes...
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\variants\standard" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src" "-IC:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp" -o "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\preproc\ctags_target_for_gcc_minus_e.cpp"
"C:\Users\user\AppData\Local\Arduino15\packages\builtin\tools\ctags\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\preproc\ctags_target_for_gcc_minus_e.cpp"
Compiling sketch...
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\variants\standard" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src" "-IC:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp" -o "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp.o"
Compiling libraries...
Compiling library "Wire"
Using previously compiled file: C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\libraries\Wire\Wire.cpp.o
Using previously compiled file: C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\libraries\Wire\utility\twi.c.o
Compiling library "LiquidCrystal I2C"
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\cores\arduino" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\variants\standard" "-IC:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire\src" "-IC:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C" "C:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C\LiquidCrystal_I2C.cpp" -o "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\libraries\LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o"
Compiling core...
Using precompiled core: C:\Users\user\AppData\Local\Temp\arduino\cores\arduino_avr_uno_dd72fbfee32d61057c6f123c402e8c36\core.a
Linking everything together...
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-gcc" -w -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p -o "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.elf" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\sketch\sketch_jan3a.ino.cpp.o" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\libraries\Wire\Wire.cpp.o" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\libraries\Wire\utility\twi.c.o" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9\libraries\LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/..\..\cores\arduino_avr_uno_dd72fbfee32d61057c6f123c402e8c36\core.a" "-LC:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9" -lm
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.elf" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.eep"
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-objcopy" -O ihex -R .eeprom "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.elf" "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.hex"
Using library Wire at version 1.0 in folder: C:\Users\user\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire
Using library LiquidCrystal I2C at version 1.1.2 in folder: C:\Users\user\Documents\Arduino\libraries\LiquidCrystal_I2C
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-size" -A "C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.elf"
Sketch uses 3134 bytes (9%) of program storage space. Maximum is 32256 bytes.
Global variables use 263 bytes (12%) of dynamic memory, leaving 1785 bytes for local variables. Maximum is 2048 bytes.
"C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude" "-CC:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf" -v -V -patmega328p -carduino "-PCOM4" -b115200 -D "-Uflash:w:C:\Users\user\AppData\Local\Temp\arduino\sketches\6AC52EBE5E6EAA16E22572C2722EDAE9/sketch_jan3a.ino.hex:i"
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Users\user\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"
Using Port : COM4
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: ser_open(): can't open device "\.\COM4": The system cannot find the file specified.
avrdude done. Thank you.
Failed uploading: uploading error: exit status 1
