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I need to write Simple JAVA program to read and write from USB serial to use it with Arduino

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  I need to write Simple JAVA program to read and write from USB serial to use it with Arduino sahm <sahm007@gmail.com> - 2012-10-13 12:54 -0700
    Re: I need to write Simple JAVA program to read and write from USB serial to use it with Arduino Lew <lewbloch@gmail.com> - 2012-10-13 13:07 -0700
    Re: I need to write Simple JAVA program to read and write from USB serial to use it with Arduino Arne Vajhoej <arne@vajhoej.dk> - 2012-10-13 19:00 -0400
    Re: I need to write Simple JAVA program to read and write from USB serial to use it with Arduino Martin Gregorie <martin@address-in-sig.invalid> - 2012-10-14 00:02 +0000
    Re: I need to write Simple JAVA program to read and write from USB serial to use it with Arduino Knute Johnson <nospam@knutejohnson.com> - 2012-10-13 17:30 -0700
    Re: I need to write Simple JAVA program to read and write from USB serial to use it with Arduino stledger@lanl.gov - 2012-10-15 11:24 -0700

#19298 — I need to write Simple JAVA program to read and write from USB serial to use it with Arduino

Hi every one 

I’m trying to write simple JAVA program that could send command to Arduino board or read output from Arduino.
I tried java-simple-serial-connector library but I keep getting error.
And in Arduino web site they use gnu.io. classpath witch I have no idea how to use it with java 

Please help me

Best 
Salim

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#19300

sahm wrote:
> I’m trying to write simple JAVA [sic] program that could send command to 
> Arduino board or read output from Arduino.
> I tried java-simple-serial-connector library but I keep getting error.
> And in Arduino web site they use gnu.io. classpath 

It's not a classpath.

> witch I have no idea how to use it with java [sic]

I can answer only part of this. To use any library with a Java program, 
typically one has that library in the form of a JAR file (file with name 
ending in ".jar", in ZIP file format and possessing certain contents; GIYF)
that one includes in the classpath (GIYF).

There are also language requirements to using libraries involving the 'import'
directive. (TIYF: The Tutorial is Your Friend.)

Download the library you need and include it in your classpath.

Follow up here with the specific commands you use, exactly how you use them, 
and copied and pasted output if you need further help. Make sure you do the 
suggested research first.

-- 
Lew

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#19315

On 10/13/2012 3:54 PM, sahm wrote:
> I’m trying to write simple JAVA program that could send command to Arduino board or read output from Arduino.
> I tried java-simple-serial-connector library but I keep getting error.
> And in Arduino web site they use gnu.io. classpath witch I have no idea how to use it with java

Serial port support has not been a priority in Java.

I believe the most common recommendation is to go for rxtx.

Arne

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#19317

On Sat, 13 Oct 2012 12:54:48 -0700, sahm wrote:

> Hi every one
> 
> I’m trying to write simple JAVA program that could send command to
> Arduino board or read output from Arduino.
> I tried java-simple-serial-connector library but I keep getting error.
> And in Arduino web site they use gnu.io. classpath witch I have no idea
> how to use it with java
> 
> Please help me
> 
You can't drive a serial connection from Linux/OS X/Windows using pure 
Java. SimpleSerial, RxTx or my SerialPort package all use C in various 
ways to build a bridge between the Java program and the serial port. This 
code is *always* compiled for the target operating system: it has 
hopefully been written to be portable but its always possible that it 
wasn't, or at least has never been ported to the version of the OS you're 
using. I think SimpleSerial and RxTx both use the JNI interface to their 
C code modules. My package uses a socket connection from the Java program 
to a separate server, written in GNU C, that drives the serial port(s) 
and that has only been compiled & tested under Linux. 

As far as I know all three were designed to work with built-in serial 
ports. I'd expect Linux or OS X to be capable of transparently driving a 
USB-serial adapter[1]. I don't use Windows so can't tell you about it. In 
any case, you still need some form of C glue because Java doesn't have 
any knowledge of USB-serial adapters.

However, there are other approaches that are worth a look. These all use 
the fact that Java can handle socket connections:

- use an Arduino board with an Ethernet interface and an onboard TCP/IP 
  software stack. Something like these: 
  http://www.amazon.com/Arduino-Ethernet-Power-over-Ethernet-Serial-
Adapter/dp/B005EJN5X6
  http://arduino.cc/en/Main/ArduinoBoardEthernet

- You can buy relatively inexpensive modules that take an Ethernet
  connection (RJ-45) socket and provide an RS-232 serial connection for
  your Arduino board. These are what I mean:
  http://gridconnect.com/network-components/xport.html
  http://kanda.com/products/Sena/NEMO10.html
  http://www.radi.com/modular64.htm

- or you can get back-to-back sockets (Ethernet (RJ45) one side, 
  RS-232 (D9) the other): http://microcontrollershop.com/product_info.php?
cPath=98_284&products_id=1459
  

[1] maybe. There are USB-serial adapters and USB-serial adapters: some 
will 'just work' with Linux and some won't.  If the adapter needs a 
driver to work under Windows, then that's possibly also a trial and error 
game. I have a pFranc USB-serial adapter that works like a charm with 
native Linux programs but refused point blank to work with a Windows 
program running on Linux under Wine. Go figure. 

-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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#19319

On 10/13/2012 12:54 PM, sahm wrote:
> Hi every one
>
> I’m trying to write simple JAVA program that could send command to Arduino board or read output from Arduino.
> I tried java-simple-serial-connector library but I keep getting error.
> And in Arduino web site they use gnu.io. classpath witch I have no idea how to use it with java
>
> Please help me
>
> Best
> Salim
>

On Windows, if you only need to read and write, you can do that with the 
COM? port.  If you need access to the serial data lines you need to find 
an old copy of the JavaComm API.  I'm using it with Windows XP, I think 
it would work with Vista or 7 but I've never tried it.  It is no longer 
supported by Oracle(Sun) but you can find it if you snoop around.  Last 
time I checked, there was still a version available from Sun for Linux I 
think.

I tried RXTX once but it was too buggy to use and there was no interest 
in fixing it.

-- 

Knute Johnson

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#19368

On Saturday, October 13, 2012 1:54:48 PM UTC-6, sahm wrote:
> Hi every one I’m trying to write simple JAVA program that could send command to Arduino board or read output from Arduino. I tried java-simple-serial-connector library but I keep getting error. And in Arduino web site they use gnu.io. classpath witch I have no idea how to use it with java Please help me Best Salim

We have had good success with SerialPort from SerialIO.com. It has worked well for a several different serial devices.

John

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