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1. Java Serial Communication Tutorial
2. Java Connect To Serial Port
3. Java Serial Port Communication
4. Java Serial Communication Pic
5. Java Serial Communication Application

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. Moreover, the Arduino will print out the digits to an LCD module (LCM1602 IIC V1). In the second part, basically the same Java application is used to send digits to the Arduino – but this time with the help of a USB-to-TTL module. As a result, the Arduino’s standard serial port can be used by the Arduino IDE to print the received digits to the serial monitor.

Most projects that deal with hardware and devices, needs to communicate with them using the COM port of the PC or Server. 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. Feb 13, 2015  A easy way to communicate between your Arduino and PC. Use the built-in serial port of an Arduino to communicate with a Java program. In this demo, a. Communicate with Arduino through Java Arduino can send message to the serial port, use Java to get the serial messages. Code on Arduino: void setup. Download Java serial communication library. For 32-bit machines (Windows, Mac OX, and Linux), download from here. Public abstract class SerialPort extends CommPort. An RS-232 serial communications port. SerialPort describes the low-level interface to a serial communications port made available by the underlying system. SerialPort defines the minimum required functionality for serial communications ports. Author: Jagane Sundar See Also. 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. Here I share the example code of my video and written tutorials about how to establish a serial connection between an Arduino and a Java program. Link to full tutorial on my personal blog.

Notes:
– I added all source codes files to a github repository: https://github.com/mschoeffler/arduino-java-serial-communication
– I made also a video tutorial

List of materials:
– Arduino Uno (for Example Part 1&2) [Search on Aliexpress Amazon]
– LCM1602 IIC V1 / LCD module (for Example Part 1) [Search on Aliexpress Amazon]
– USB-to-TTL Serial Adapter (for Example Part 2) [Search on Aliexpress Amazon]

Example Part 1

Setup
In this part, we have to wire an LCM1602 IIC V1 to the Arduino. The LCM1602 has four pins: VCC, GND, SDA, and SCL. The wiring is straightforward: VCC goes to the Arduino’s 5V. The other three pins have the exact same names on the Arduino: GND goes to GND, SDA to SDA, and SCL to SCL. Have a look at the fritzing file for more details:

Java Serial Communication Tutorial

Fritzing files that shows how to wire an LCM1602 IIC V1 module to an Arduino Uno.

Arduino Source Code
Next, we have to write some code for the Arduino Uno. Basically, the code just waits for bytes ready to be read by the serial port. If a byte was read, it is printed out to the LCM1602 IIC V1 module.

Java Source Code
The Java application uses the jSerialComm library to send text to an Arduino Uno via a standard USB connection. 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 (0-4) are written to the serial port. Finally, the serial connection is closed:

Java Connect To Serial Port

The main important method call is SerialPort.getCommPort(..). 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. You can find out the device name of your Arduino Uno by having a look to the Arduino IDE. In Tools->Port you find all connected devices. 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. So simply copy the device name from your Arduino IDE to the Java source code.

Execution
When you have uploaded the source code to the Arduino and started the java application, you should see that the digits 0-4 appear on the LCM1602 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 ;)

Example 2

In the second part of this tutorial, the digits (coming from the Java application) are printed to the default serial connection of the Arduino. As a result, the received digits can be viewed from the Arduino IDE’s serial monitor (Tools -> Serial Monitor). 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. Therefore, we make use of a USB-to-TTL serial adapter.

Setup
Typically, a USB-to-TTL adapter has at least four pins: VCC, GND, RX (receive data), and TX (transmit data). As we will use this adapter only to send data from the Java application, we can ignore the RX pin. VCC must be connected to the Arduino’s 5V pin, GND must be connected to the Arduino’s GND pin, and TX must be connected to the Arduino digital pin #5 (also other digital pins can be used).

Fritzing file that shows how to connect a USB-to-TTL serial adapter to an Arduino Uno.

Here you see how my setup looks like (including the serial adapter):

USB-to-TTL serial adapter connected to an Arduino Uno.

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. The only exception is the device name of the USB-to-TTL device. Conveniently, you can again make use of the Arduino IDE as it will show you the name of the serial adapter, too.

Java Serial Port Communication

Java Serial Communication Pic

Execution:
If everything was successfully executed, the serial monitor of the Arduino IDE should show five received digits.

Shows the result of a serial connection between a Java application (Eclipse IDE) and an Arduino Uno (Arduino IDE / serial monitor).

Java Serial Communication Application

Video Tutorial: