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Hi I have a Duemilanove and an Uno. I am using two boards because I need 8 PWM pins (using 4 from each).

All I need to do is send 4 numbers to the Arduino and use those 4 values to set the PWM output on 4 pins.

I am having trouble sending serial communication to/from my Uno to a computer (the Duemilanove works great) and really need to get this solved today (thanks for the help)

I connect the Duemilanove to my computer and it shows up as device /dev/ttyUSB0 and I connect the Uno to my computer and it shows up as device /dev/ttyACM0.

If I send serial communication from the Arduino IDE the UNO communicates fine. If I try sending from my computer it fails to find the device.

I have debugged it and found that the method
     Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
does not return /dev/ttyACM0 as a device (it does return /dev/ttyUSB0 which is why the Duemilanove works)

Any way to get around this? I am kinda desperate on this.

This is my Arduino code (both boards have same code)
Code:
// Communication with Antenna
int inByte = 0;         // Incoming serial byte
int outputPin1 = 11;
int outputPin2 = 10;
int outputPin3 = 9;
int outputPin4 = 6;

void setup()  {
 
  // Open a serial connection to the computer
  Serial.begin(9600);
 
  // Set the PWM ports to output
  pinMode(outputPin1,OUTPUT);
  pinMode(outputPin2,OUTPUT);
  pinMode(outputPin3,OUTPUT);
  pinMode(outputPin4,OUTPUT);
}

void loop()  {
 
  if (Serial.available() > 0) {
   
    Serial.println("Recieved Message");
   
    // Get incoming byte, Echo the number back to
    // the computer then write voltage to PWN pin
    inByte = Serial.read();
    Serial.println(inByte);
    analogWrite(outputPin1, inByte);
    delay(20);
   
    inByte = Serial.read();
    Serial.println(inByte);
    analogWrite(outputPin2, inByte);   
    delay(20);
   
    inByte = Serial.read();
    Serial.println(inByte);
    analogWrite(outputPin3, inByte);   
    delay(20);
   
    inByte = Serial.read();
    Serial.println(inByte);
    analogWrite(outputPin4, inByte);   
    delay(20);
  }
}

This is my Java code:

Code:
package cessararduino;

import gnu.io.NoSuchPortException;
import java.io.InputStream;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.util.Enumeration;
import java.util.logging.Level;
import java.util.logging.Logger;

public class SerialTest implements SerialPortEventListener {

        SerialPort serialPort_09;
        SerialPort serialPort_10;
       
        /** The port we're normally going to use. */
private static final String PORT_NAMES_09[] = {
"/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyUSB0", // Linux
"COM3", // Windows
};
        private static final String PORT_NAMES_10[] = {
"/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyACM0", // Linux
                        "/dev/ttyACM1", // Linux
                        "/dev/ttyUSB1", // Linux
"COM3", // Windows
};
/** Buffered input stream from the port */
private InputStream input;
/** The output stream to the port */
private OutputStream output;
/** Milliseconds to block while waiting for port open */
private static final int TIME_OUT = 2000;
/** Default bits per second for COM port. */
private static final int DATA_RATE = 9600;

        public void initialize() {
            System.out.println("Initializing the object");           
        }
       
public void initialize_09() {
CommPortIdentifier portId_09 = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
        try {
            CommPortIdentifier.getPortIdentifier("/dev/ttyACM0");

            // iterate through, looking for the port
        } catch (NoSuchPortException ex) {
            Logger.getLogger(SerialTest.class.getName()).log(Level.SEVERE, null, ex);
        }

// iterate through, looking for the port
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
                        System.out.println(currPortId.getName());
for (String portName : PORT_NAMES_09) {
if (currPortId.getName().equals(portName)) {
portId_09 = currPortId;
}
}
}

if (portId_09 == null) {
System.out.println("Could not find COM port.");
return;
}

try {
// open serial port, and use class name for the appName.
serialPort_09 = (SerialPort) portId_09.open(this.getClass().getName(),
TIME_OUT);

// set port parameters
serialPort_09.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);

// open the streams
input = serialPort_09.getInputStream();
output = serialPort_09.getOutputStream();

// add event listeners
serialPort_09.addEventListener(this);
serialPort_09.notifyOnDataAvailable(true);
} catch (Exception e) {
System.err.println(e.toString());
}
           
}
 
public void initialize_10() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

// iterate through, looking for the port
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
for (String portName : PORT_NAMES_10) {
if (currPortId.getName().equals(portName)) {
portId = currPortId;
break;
}
}
}

if (portId == null) {
System.out.println("Could not find COM port.");
return;
}

try {
// open serial port, and use class name for the appName.
serialPort_10 = (SerialPort) portId.open(this.getClass().getName(),
TIME_OUT);

// set port parameters
serialPort_10.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);

// open the streams
input = serialPort_10.getInputStream();
output = serialPort_10.getOutputStream();

// add event listeners
serialPort_10.addEventListener(this);
serialPort_10.notifyOnDataAvailable(true);
} catch (Exception e) {
System.err.println(e.toString());
}
}

/**
* This should be called when you stop using the port.
* This will prevent port locking on platforms like Linux.
*/
public synchronized void close() {
            if (serialPort_10 != null) {
serialPort_09.removeEventListener();
serialPort_09.close();
}
if (serialPort_10 != null) {
serialPort_10.removeEventListener();
serialPort_10.close();
}
}

/**
* Handle an event on the serial port. Read the data and print it.
*/
public synchronized void serialEvent(SerialPortEvent oEvent) {
if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
int available = input.available();
byte chunk[] = new byte[available];
input.read(chunk, 0, available);

// Displayed results are codepage dependent
System.out.print(new String(chunk));
} catch (Exception e) {
System.err.println(e.toString());
}
}
// Ignore all the other eventTypes, but you should consider the other ones.
}

public static void main(String[] args) throws Exception {
           
            SerialTest serialPort_09 = new SerialTest();
            SerialTest serialPort_10 = new SerialTest();
           
            try{
serialPort_09.initialize_09();
                //serialPort_10.initialize_10();
               
                // Wait 2 seconds for serial port to settle
                Thread.sleep(2000);
               
                System.out.println("Started");
               
                // Send 6 numbers to the arduino board
                serialPort_09.output.write(0);   // Output1
                serialPort_09.output.write(64);  // Output2
                serialPort_09.output.write(128); // Output3
                serialPort_09.output.write(255); // Output4
               
                // Send 6 numbers to the arduino board
                serialPort_10.output.write(0);   // Output1
                serialPort_10.output.write(64);  // Output2
                serialPort_10.output.write(128); // Output3
                serialPort_10.output.write(255); // Output4
            }
            catch (Exception e)
            {
                serialPort_09.close();
                serialPort_10.close();
            }
               
}
}
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