使用Java控制Arduino

Question

我希望用Java程序打开和关闭LED.我在大约5分钟内完成了C#中的项目,但在Java中似乎更具挑战性.我让Arduino等待1或0写入COM端口,并根据它改变LED.我用于Arduino的代码如下.

int LedPin = 13;
char data;

void setup()
{
    Serial.begin(9600);
    pinMode( LedPin , OUTPUT );
}

void loop()
{
    data = Serial.read();
    if (Serial.available() > 0)
    {
        if(data == '1' )
        {
            digitalWrite(LedPin,HIGH);
        }
        else if(data == '0' )
        {
            digitalWrite(LedPin,LOW);
        }
    }
    else
        if (Serial.available()<0)
        {
            digitalWrite(LedPin,HIGH);
            delay(500);
            digitalWrite(LedPin,LOW);
            delay(500);
        }
}

我如何使用Java应用程序执行此操作？

Answer 1

您可以使用JArduino(Java-Arduino)库,它提供Java API来使用串行端口控制您的Arduino(使用USB电缆,或从软件角度看作为串行端口的无线设备),UDP(通过以太网)屏蔽).与Java和Arduino之间的通信相关的所有代码都由库内部管理.

这是一个闪烁LED的Java示例:

public class Blink extends JArduino {

public Blink(String port) {
    super(port);
}

@Override
protected void setup() {
    // initialize the digital pin as an output.
    // Pin 13 has an LED connected on most Arduino boards:
    pinMode(DigitalPin.PIN_12, PinMode.OUTPUT);
}

@Override
protected void loop() {
    // set the LED on
    digitalWrite(DigitalPin.PIN_12, DigitalState.HIGH);
    delay(1000); // wait for a second
    // set the LED off
    digitalWrite(DigitalPin.PIN_12, DigitalState.LOW);
    delay(1000); // wait for a second
}

public static void main(String[] args) {
    String serialPort;
    if (args.length == 1) {
        serialPort = args[0];
    } else {
        serialPort = Serial4JArduino.selectSerialPort();
    }
    JArduino arduino = new Blink(serialPort);
    arduino.runArduinoProcess();
}
}

JArduino可在以下网址获得:JArduino

Answer 2

为了与Java中的comm端口进行通信,您需要一些Java Communications API的实现.我可以证明RXTX,我以前用它来与Arduino通信.

实现Java通信后,与Arduino进行通信变得相当简单:

CommPort arduino = getArduinoPort();
arduino.getOutputStream().write(1);

public CommPort getArduinoPort() {
    Enumeration ports = CommPortIdentifier.getPortIdentifiers();
    while(ports.hasMoreElements()) {
        CommPortIdentifier identifier = (CommPortIdentifier) ports.nextElement();
        if(isArduino(identifier)) {
            return identifier.open(getClass().getName(), 2000); // 2 second timeout
        }
    }
    return null;
}

public boolean isArduino(CommPortIdentifier identifier) {
    // if you know the name of the port ahead of time you can
    // compare it here with identifier.getName(), otherwise
    // you can interface with the user like the Arduino IDE's
    // serial monitor
}

RXTX网站还有其他一些你可能会觉得有用的例子 [ 2 ].

Answer 3

借助优秀的HaikuVM,您可以轻松地使用Java构建Arduino程序.

这是一个例子:

import static processing.hardware.arduino.cores.arduino.Arduino.*;

public class Blink {
    static byte ledPin = 13;            // LED connected to digital pin 13

    public static void setup() {
        pinMode(ledPin, OUTPUT);        // sets the digital pin as output
    }

    public static void loop()           // run over and over again
    {
        digitalWrite(ledPin, HIGH);     // sets the LED on
        delay(500);                    // waits for a second
        digitalWrite(ledPin, LOW);      // sets the LED off
        delay(500);                    // waits for a second
    }
}