Java serial port example

GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.

If nothing happens, download the GitHub extension for Visual Studio and try again. For usage examples, please refer to the Usage wiki. In order to use the jSerialComm library in your own project, you must simply include the JAR file in your build path and import it like any other Java package using import com.

Alternatively, you can automatically add jSerialComm to your project as a dependency from the Maven Central Repository. Use the following dependency declaration depending on your build system:. If you are using Linux and this library does not appear to be working, ensure that you have the correct permissions set to access the serial port on your system. One way to test this is to run your application as root or by using the sudo command.

If everything works, you will need to either run your application as root in the future or fix the permissions on your system. For further instructions, refer to the Troubleshooting wiki. In this case, you can force the library to disable its auto-detect functionality and instead directly specify the architecture using the Java os.

This is not a bug, but rather a limitation of the Linux operating system. For other troubleshooting issues, please see if you can find an answer in either the Usage-Examples wiki or the Troubleshooting Wiki. If your question is still not answered, feel free to open an issue report on this project's GitHub pageand we will be glad to look into it. Building this library yourself is not advised at least not for distribution since it requires native compilation across multiple platforms.

It is recommended to simply use the pre-built jSerialComm library in your application. If you do choose to build this library for your specific system, the recommended methodology is to use Gradle coupled with the Java SDK, version 1.

Once the Java SDK 1. Once this has been done, refer to the section corresponding to your specific Operating System for further instructions. Please note, if you would like to edit any of the source code or view it in an IDE such as Eclipseyou can automatically build the Eclipse project files by entering the following on a command line or terminal from the base directory of this project:.

The correct directory can usually be found by entering the following command:. Ensure that you have a cross-compiler installed on your Linux distribution capable of compiling for both x86 and Sparc-based Solaris architectures.

Instructions for creating such a toolchain can be found on the Solaris Cross-Compiler wiki. Ensure that you have a cross-compiler installed on your Linux distribution capable of compiling for ARM-based architectures. I prefer crosstool-ng for this purpose. Ensure that the Android NDK is installed on your system. Ensure that Xcode is installed on your system. If it is not, it can be downloaded via the App Store. You must also make sure that the Xcode Command Line Tools are installed.

This can be done by entering the following command in a terminal: xcode-select --install. On Windows, the Visual Studio Compiler must be configured to build either or bit binaries but never both at the same time. Therefore, you will have to build binaries for the two architectures separately. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. Platform-independent serial port access for Java. C Java Makefile.This is more of a follow-up to my previous post about serial programming in Java here and how to install the RXTX libraries here. I wrote an example program that includes all of those steps in it and are each in their own separate method within the class, but first I will go through my hardware set up.

User input is given from the PC through the a Java GUI that contains code for serial communication, which is the code presented here. The Arduino is responsible for reading this data. This set up is pretty much using my computer as a remote control for whatever device is on the Arduino end. It could be a motor control, on-off switch, etc. However, I did create a GUI for testing purposes.

See the Code Downloads section for the actual files. Above is the picture of the GUI complete with the buttons that I use to interact with the program. I also added key bindings which I can use to control the throttle. When the program is first started, none of the GUI elements will work except for the combo box and the connect button. Once a successful connection is made the controls are enabled. This is done through the use of the setConnected true and the toggleControls methods shown in the example code that follows.

Depending on the Java IDE it might already know to tell you to use these imports except for the first one. I named my class Communicatorbut the name is really up to the programmer. The name pretty much reflects its intended use. The class should also implement the SerialPortEventListener class.

This is a class in RXTX and is required in order to receive incoming data.

java serial port example

This method will be defined later. Below are the variables and constants that I defined in my class. What the variables are for is in the comments but a more detailed explanation will follow.

The GUI class extends javax. What that means is that I can associate put method the name of a serial port, say a string that says COM1, to an object in the code. Later, I can access the name COM1 from the HashMap by using the get method and it will return the object that it was associated with previously.

The CommPortIdentifiers object is needed to gather the list of ports that are available for connection. The SerialPort object is for storing the data for the port once a successful connection is made.

The InputStream and OutputStream is the object that is required for sending and receiving data. The constants for the ASCII values are some values that I use to send through the output stream that act as delimiters for data.

The string logText is basically what the comment says. When stuff happens in the program, the program stores a string in this variable and it will be appended to a text area in the GUI.

The method below is for searching for available serial ports on the computer. The method getPortIdentifiers returns an Enumeration of all the comm ports on the computer. The code can iterate through each element inside the Enumeration and determine whether or not it is a serial port.The following example demonstrates how to transmit and receive data using the Raspberry Pi serial port.

By default, the serial port on the Raspberry Pi is configured as a console port for communicating with the Linux OS shell. If you want to use the serial port in a software program, you must disable the OS from using this port.

The following JavaDoc links are the primary interfaces used to communicate via the Pi's serial ports:. The following circuit can be used in conjunction with this sample code.

First, locate the SerialExample. To test this program you will need to connect your computer via serial cable and use a serial communications tool such as Hyperterminal or Indigo Terminal Emulator.

Establish a connection using baud rate with parity set to NONE, data bits to 8 and stop bits to 1. Last Published: Version: 1. Serial Communication Example using Pi4J. CommandArgumentParser; import com. Console; import java. IOException; import java. JavaDoc The following JavaDoc links are the primary interfaces used to communicate via the Pi's serial ports: com. SerialFactory com.

java serial port example

Serial com. SerialDataEvent com. Compile Next, use the following command to compile this example program: javac -classpath. Execute The following command will run this example program: sudo java -classpath.

Output To test this program you will need to connect your computer via serial cable and use a serial communications tool such as Hyperterminal or Indigo Terminal Emulator. You can also submit data from the terminal software and that data should be displayed on the Raspberry Pi's console.Most projects that deal with hardware and devices, needs to communicate with them using the COM port of the PC or Server.

java serial port example

For example if there is a modem that is connected to a server via its COM port and the Java program has to read the output of the modem then the Java program has to read the COM port for any incoming data. Importing Keystore example using keytool in Java.

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Tutorial: Serial Connection between Java Application and Arduino Uno

Calculate gross salary in Java. Calculate average sale of the week in Java. Vector in Java - Sample Program. MultiLevel Inheritance sample in Java. Multiple Inheritance sample in Java. Java program using Method Overriding. Java File. Java String. Reverse a number in Java. Handling Fractions in Java. Hi Steven. How to run this Program? Once i run it gives the following error. Hi, I can run this program. I tried with this. Hi Steve. Hi Steve, thanks for your code.

HelloHow could i Run java. Pretty good information! I am trying to connect mobile to PC. About the javax. Hi, Steven!In this tutorial, I demonstrate how to build up a serial connection between a Java Application and an Arduino Uno. The tutorial is divided into two parts: In the first part, it is explained how to send text digits from a Java Application to an Arduino.

Have a look at the fritzing file for more details:. Basically, the code just waits for bytes ready to be read by the serial port. I made use of Maven to set up the dependency between my Java project and the jSerialComm library. If you also use Maven for your project, then my POM file might be of use to you:. The actual Java source code is only a single class with a main method.

A serial connection is established. Then, five digits are written to the serial port. Finally, the serial connection is closed:. The main important method call is SerialPort. The method has only one argument which has to be the device name of your Arduino Uno.

Therefore, it is very likely that you need to change this argument value. In order to upload code to an Arduino, you have to select the correct device name of the corresponding Arduino. Luckily, the same device name is needed by the jSerialComm library. Execution When you have uploaded the source code to the Arduino and started the java application, you should see that the digits appear on the LCM IIC V1 module.

Sometimes, I have problems executing this code, if I use cheap Arduino clones. Luckily, it always executes perfectly on my original Arduino Uno from Italy. In the second part of this tutorial, the digits coming from the Java application are printed to the default serial connection of the Arduino.

Arduino to PC communication using USB serial and Java

Unfortunately, as a consequence, the standard USB connection cannot be used by the Java application since the serial monitor will already catch the serial port as soon as we open it. As we will use this adapter only to send data from the Java application, we can ignore the RX pin.

Arduino Source Code: The Arduino program makes use of a so-called software serial. When a software serial object is initialized, it requires the pin numbers of the receive and transmit pin. As we do not plan to transmit text from the Arduino Uno, we can set the transmit pin to any number. Here, I simply set it to 6. Java source code: The Java application is basically the same than the one used in part one of this tutorial.

Conveniently, you can again make use of the Arduino IDE as it will show you the name of the serial adapter, too. Execution: If everything was successfully executed, the serial monitor of the Arduino IDE should show five received digits. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

This site uses Akismet to reduce spam. Learn how your comment data is processed. Leave a Reply Cancel reply Your email address will not be published.USB serial is available on nearly all Arduino based boards. Further, there are serial interface Java libraries that can connect to an Arduino.

If you are unfamiliar with data communications in general, take a look a the introduction to data communications article ; although it does not cover serial communication, it is still a good starting point for the unfamiliar. For an out the box complete solution checkout our new BETA library tcMenu library for Arduino including remote control.

Two way communcation with the serial port

TcMenu not only provides a full menu system with designer, but also remote control from Arduino to Java using RS or Ethernet. Take note of the ports used for the various connectors as they will be needed to set up the sketch later. Note that this script uses PWM contrast based on the link above.

Now wire the switches in as well, each switch should be wired to the board as per the example circuit on the left never use less that a 4k7 resistor for this or the current drain will increase. At 4k7 the current drain for each switch when on is about 1mA; which is not particurly high even with a few switches normally on.

At this point you should have both the 20x4 display and a few switches connected according the circuit above. Now is the time to load the code onto the Arduino device. In the script there are some changes that need to be made, in order to tell the script where to expect the LCD display and also the buttons. Once everything is wired up, you will need to enter the pins used for the display and switches noted earlier into the sketch. Change the constants at the top of the sketch as shown in the example below using your own settings.

In my example I had the buttons connected on bins Now we configure the serial communication speed, I set it to be baud but over USB, it can reliably run faster. As long as all is wired up correctly you should be able to run the script on your Arduino, the display should initialise and look like the example below. If not, switch off and check your wiring and code carefully.

The PWM contrast setting can be adjusted in the setup section of the script. There are several examples contained within the code, you want to look in the com. In order to run the project, run the class:.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You have to import javax. SerialPort for this purpose to do, refer to Read from a Serial port to know more information. You could use RXTX or java. Learn more. Asked 8 years, 5 months ago. Active 8 years, 5 months ago. Viewed 58k times. Is there a little example of how to write and read a serial port in Java with Windows?

Peter Mortensen JBerta93 JBerta93 2 2 gold badges 10 10 silver badges 25 25 bronze badges. Active Oldest Votes. FYI: Oracle's implementation of javax. It isn't available for Windows, which the original question was about.

See oracle. Vlad Vlad 8, 2 2 gold badges 27 27 silver badges 33 33 bronze badges. I used RXTX library. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits.

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java serial port example

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