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

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kim poh chiew
kim poh chiew 2015-11-26
评论： Pooria Mozafary 2024-6-3
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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回答（6 个）

HAMZA ABBASI
HAMZA ABBASI 2018-6-24
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 2020-12-30
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 2016-3-5
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 2016-3-21
编辑：PRAPTI GANGULY 2016-3-21
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 2017-10-11
Same issue here. Any solution?
  2 个评论
dany sandoval
dany sandoval 2017-11-7
编辑：dany sandoval 2017-11-7
yes, i finded a solution: first: clear a ('a' it´s a object to clear) second: if ~isempty(instrfind) fclose(instrfind); delete(instrfind); end If the port is open, close the port and delete the state

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shawn oneal
shawn oneal 2022-6-17
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
Amaresh A.R
Amaresh A.R 2016-5-20
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..
Emmanuel Arthur
Emmanuel Arthur 2023-3-8
I am working on this Arduino kit R2 with arduino nano 33 IoT.
I am running the attached program on Simulink to the board but I get this error.
I followed the instruction given on the kit website (Engineering Kit! (arduino.cc) under designing a motor control system) using MATLAB version R2022b.
I have tried inputing the port manually under Simulink Configuration Parameters>Hardware Implementation>Host-board connection, yet I get the same problem.
Can I get some assistance?

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