ARDUINO UNO : cannot upload sketch.

Development Boards Arduino
1

system : windows 7 ultimate 32 bit

Problem : arduino uno is not detected and does not show any com ports on device manager

and com3 port is selected by default in the IDE

tried installing using legacy hardware but didn’t work either.

please help me.

error message:

Arduino: 1.8.5 (Windows 7), Board: “Arduino/Genuino Uno”

Sketch uses 928 bytes (2%) of program storage space. Maximum is 32256 bytes.

Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.

C:\Users\Abhijit\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/bin/avrdude -CC:\Users\Abhijit\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -carduino -PCOM3 -b115200 -D -Uflash:w:C:\Users\Abhijit\AppData\Local\Temp\arduino_build_912316/led.ino.hex:i

avrdude: Version 6.3, compiled on Jan 17 2017 at 12:00:53

Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is “C:\Users\Abhijit\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino9/etc/avrdude.conf”

Using Port : COM3

Using Programmer : arduino

Overriding Baud Rate : 115200

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x30

avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x20

avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x30

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x20

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x30

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x20

avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x30

avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x20

avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x30

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x20

avrdude done. Thank you.

An error occurred while uploading the sketch

This report would have more information with

“Show verbose output during compilation”

option enabled in File → Preferences.

2

Where did you get the Arduino Uno from? links?

3

Valen:
Where did you get the Arduino Uno from? links?

got it from a local store
4

Is it a genuine Arduino, or a clone?

Did you try other USB ports? Consider the steps in this guide:

https://www.arduino.cc/en/Guide/ArduinoUno#toc3

5

I guess it is a clone coz it does not have arduino logo on it.

6

Did it have any program on it when you first applied power? Blink sketch should be on it normally.

7

Blink sketch was there on it.

I installed ch340 chip software , Windows detected it.

But after uploading one sketch. ,it is now showing as unknown device.

Now what should i do?

8

Can you make a screenshot of your device manager? And unfold any Maybe the serial port is there under a different name. In the menu of device manager there is also the option to show hidden devices. I currently do not have an arduino device attached but I can see it once was through that option.