Using "serial" to connect to an Arduino
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I got an Arduino for xmas, and I'm trying to talk to it from MATLAB (R2012a prerelease) via the serial interface. I'm not having any luck at the moment, I can talk to it from python no problem. Here's what I've got:
>> s = serial('/dev/ttyACM0', 'BaudRate', 9600);
>> fopen(s)
Error using serial/fopen (line 72)
Open failed: Port: /dev/ttyACM0 is not available. Available ports: /dev/ttyS0.
Use INSTRFIND to determine if other instrument objects are connected to the requested device.
But in ipython:
In [1]: import serial
In [2]: s = serial.Serial('/dev/ttyACM0', 9600)
In [3]: s.readline()
Out[3]: '408\r\n'
I've tried '/dev/ttyS0' and made sure I closed old connections, but I still get this error. I've run out of ideas, anyone have suggestions?
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更多回答(4 个)
Walter Roberson
2012-1-4
Is ttyACM0 a virtual USB port? If so then the device needs to be connected when you start MATLAB, as MATLAB only scans the device table once.
Jan
2012-4-19
i got the same problem. using ubuntu 11.10 and matlab 2010b with arduino ide 1.0
in which folder do i have to put the java.opts file?
/usr/local/MATLAB/R2010b/ ?
Bagus Tris Atmaja
2015-2-7
I have same problem with Matlab 2013 in Ubuntu 14.04. When I try fnd info from serial port, it is live,
>> instrhwinfo('serial')
ans =
AvailableSerialPorts: {'/dev/ttyS101'}
JarFileVersion: 'Version 3.3'
ObjectConstructorName: {'serial('/dev/ttyS101');'}
SerialPorts: {'/dev/ttyS101'}
but, when I connect it with arduino (using ArduinoIO package),
>> a=arduino('/dev/ttyS101');
Attempting connection .............
Warning: Unsuccessful read: A timeout occurred before the Terminator was reached.
Error using arduino (line 104)
Connection unsuccessful, please make sure that the board is powered on, running a
sketch provided with the package, and connected to the indicated serial port. You
might also try to unplug and re-plug the USB cable before attempting a
reconnection.
Any idea? I guess the error from ArduioIO package
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