Failed to open serial port COM3 to communicate with board Uno.

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Encounter this error when i tried to connect my arduino board with my matlab :Failed to open serial port COM3 to communicate with board Uno. Make sure there is no other MATLAB arduino object for this board. For troubleshooting, see Arduino Hardware Troubleshooting.
Can anyone solve this?
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Answers (5)

HAMZA ABBASI
HAMZA ABBASI on 24 Jun 2018
clear object name like (clear a) will not work.... write clear all statement in the first line of code
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Pathmashantha Senanayaka
Pathmashantha Senanayaka on 30 Dec 2020
hellow everyone. I want to make serial communication with arduino mega using matlab guide. Can enyone Please show me example code.

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Aamil  Patel
Aamil Patel on 5 Mar 2016
Failed to open serial port COM3 to communicate with board Uno. Make sure there is no other MATLAB arduino object for this board. For troubleshooting, see Arduino Hardware Troubleshooting.
this is the error message i get
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PRAPTI GANGULY
PRAPTI GANGULY on 21 Mar 2016
Edited: PRAPTI GANGULY on 21 Mar 2016
I got the same error message. Make sure there is no other object in the workspace. type 'clear' to clear the workspace and then try running the code.

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Yehia Khalifa
Yehia Khalifa on 11 Oct 2017
Same issue here. Any solution?
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Amaresh A.R
Amaresh A.R on 20 May 2016
Hello everyone..
when i am trying to connect arduino which is connected on COM2 i get the below error..
"Failed to open serial port COM2 to communicate with board Uno. Make sure there is no other MATLAB arduino object for this board. For troubleshooting, see Arduino Hardware Troubleshooting."
how to overcome this problem... please help TYIA..

shawn oneal
shawn oneal on 17 Jun 2022
Hi Everyone,
I recently started the Arduino engineering kit and ran into this problem. It ended up being the driver. I never opened the Arduino IDE while connected to the Arduino33 Iot. Once this is done, the driver download is suggested. After I downloaded that I got the simulink model to run with default host-board connection settings, except the serial comms baudrate which is 9600 and external mode communication interface set to Serial.
Hope this helps

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