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2014-03-11 23:24:40 -0500	answered a question	Error in Arduino-ROS connection Solved! There was a problem in the installation of ros_lib due to Arduino sketchbook permissions. Thanks!
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2014-03-11 00:56:53 -0500	asked a question	Error in Arduino-ROS connection Hello to all! A few months ago, I connected Arduino to ROS fuerte using rosserial without problems. However, now I'm trying to reproduce it in ROS groovy and I always get the same error. I am working with Ubuntu 12.04, ROS Groovy, Arduino 1.0.5, rosserial-groovy-devel and both Arduino Uno and Arduino Mega. I do these commands: Window 1: sudo ./Arduino/arduino Open Hello World example. Select Controller Arduino Uno/Mega. Select Serial Port /dev/ttyACM0. Load code. Window 2: roscore Window 3: sudo chmod a+rw /dev/ttyACM0 rosrun rosserial_python serial_node.py /dev/ttyACM0 And I get this error: [INFO] [WallTime: 1394533587.406466] ROS Serial Python Node [INFO] [WallTime: 1394533587.419060] Connecting to /dev/ttyACM0 at 57600 baud [ERROR] [WallTime: 1394533590.332723] Creation of publisher failed: unpack requires a string argument of length 4 [ERROR] [WallTime: 1394533591.328157] Tried to publish before configured, topic id 125 Anyone can help me? Thanks in advance!