Serial Port Already in Use - MacOSX Lion

Help & Support Robot Parts
1

I have purchase a makey makey board and I am trying to upload Arduino code onto it from my macbook air running OSX 10.7.5.

I when I try to upload the code i get the following area message that my serial port is already in use…

processing.app.SerialException: Serial port ‘/dev/tty.usbmodem1421’ already in use. Try quitting any programs that may be using it.
at processing.app.Serial.touchPort(Serial.java:119)
at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:203)
at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
at processing.app.Sketch.upload(Sketch.java:1671)
at processing.app.Sketch.exportApplet(Sketch.java:1627)
at processing.app.Sketch.exportApplet(Sketch.java:1599)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2380)
at java.lang.Thread.run(Thread.java:695)

can please explain how i fix this problem. I have been searching on the interwebs and just can’t find a fix.

2

I haven’t experienced this problem myself, but it seems to be a common problem for the RXTX library (used Arduino) on Mac OS X. Here are a few posts that might help you fix your computer:

We hope this helps,