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Updating server code on board Nano3 (COM5). Please wait. How can I solve this?

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Hello
When I try to connect to arduino I get this message
>> a=arduino('com5','nano')
Updating server code on board Nano3 (COM5). Please wait.
but after about 10 seconds it connect and give me the details
a =
arduino with properties:
Port: 'COM5'
Board: 'Nano3'
AvailablePins: {'D2-D13', 'A0-A7'}
Libraries: {'I2C', 'SPI', 'Servo'}
whats the problem? Because when I want to read RFID works fine, but where I then want to turn on a green led that shows the same error and stops the RFID reader then I can only turn on the light
I can not read RFID again until I do restart for the Arduino board and load the skitch again.
I tried a lot of proposed solutions but could not find a solution
  2 Comments
Madhu Govindarajan
Madhu Govindarajan on 13 Aug 2018
Can you explain your workflow a little bit for us to be able to understand your situation better and assist?
Here are some points to clarify in the meantime -
1) When you use a = arduino, you are downloading a server sketch from MATLAB to Arduino that will make your arduino respond to a set of functions/methods. It does erase any previous sketch running on the Arduino from Arduino IDE or Simulink support for Arduino.
2) If you want to run a sketch from the Arduino IDE and still be able to communicate with MATLAB, then you must use serial communication which comes with the Instrument Control Toolbox to get full functionality.
HTH, Madhu
wisam kh
wisam kh on 15 Aug 2018
Edited: wisam kh on 15 Aug 2018
@Madhu Govindarajan
Thank you for this interaction. At first I would like to clarify something, the code is placed on the Arduino panel until it reads the RFID, using the Arduino C language, but it is up to the Matlab to make scan of the Arduino so that Matlab can have what the Arduino read.
What I understand from your words is that I have to use another port if I want to control other things on the Arduino

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Answers (1)

Madhu Govindarajan
Madhu Govindarajan on 17 Aug 2018
Create a serial object in MATLAB for the port you are writing data to via your Arduino Sketch. Go through this list of functions to see which one is appropriate to read the type of data you are sending-
https://www.mathworks.com/help/releases/R2018a/matlab/serial-port-devices.html

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