Com Port Access Denied Problem when trying to upload

Development Tools IDE 1.x
1

HI,

I am using Arduino IDE on Windows 10. When I try to upload the Blink sketch from examples, it always give COM port access denied. I have tried with 2 different boards Uno R3 and Mega2560 R3. I tried using different USB cables. I tried changing the COM port no in Device Manager.

I can reset the board So I guess Bootloader is working fine.

Error Message

Arduino: 1.6.8 Hourly Build 2016/01/19 08:42 (Windows 10), Board: "Arduino/Genuino Uno"

Sketch uses 1,066 bytes (3%) of program storage space. Maximum is 32,256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes.
avrdude: ser_open(): can't open device "\.\COM3": Access is denied.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Please help.

Thanks

2

Perhaps you should get rid of the "hourly build" version and install the regular, tried-and-tested, version 1.6.7 of the IDE.
Hourly builds often have issues.
See vaclav's post here:- 21 January 2016 hourly won't compile - Installation & Troubleshooting - Arduino Forum

3

Hi

I had this problem and it was because the driver was looking at COM4 which was the other USB port and not COM 3

sorry if this is not the answer but mine was cured by just plugging the USB cable into COM4

regards

Steve

4

Hola amigo, lo que puedes hacer es irte al menú Tools y en la parte de Ports seleccionar el puerto COM donde está conectado tu arduino, después vuelve a tratar de cargar tu código.

5

You Have to change The com port from tools>Port>(It will show up in the exact port the arduino/Genuino connected with)