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Dynamixel motors not found

asked 2012-10-23 06:33:09 -0500

joe.s gravatar image

updated 2012-10-23 06:33:42 -0500

I'm going through this tutorial about connecting/ running Dynamixel servos through ROS (these are AX-12 servos). In step 3.Step 2: Create a launch file for the manager node, I created a .launch file as instructed by copy-pasting the supplied code in to a new file named controller_manager.launch. After executing the command "roslaunch dynamixel_tutorials controller_manager.launch", I receive an error. The error states [FATAL] [WAllTime: 13151009139.949289] pan_tilt_port: No motors found

The error log file referenced states the same information, the motors can not be "pinged" and therefore the process is killed.

Running the command ls -la /dev/ttyUSB*

Gives me crw-rw-r-- 1 turtlebot 188, 0 Oct 23 11:18 /dev/ttyUSB0

lsusb gives me Bus 002 Device 003: ID 0403:6001 Future Technology Devices...

So it looks like the computer "sees" the USB connector. I've even tried a different motor and different power supply...

Any ideas?

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What version of ROS are you using?

arebgun gravatar image arebgun  ( 2012-10-29 13:53:42 -0500 )edit

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answered 2012-10-29 14:38:50 -0500

arebgun gravatar image

I have updated the tutorial to work with Electric and Fuerte version of the dynamixel_motor stack.

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answered 2012-12-03 21:07:24 -0500

Elizabeth C gravatar image

The USB port isn't set to writable. Run sudo chmod a+rw /dev/ttyUSB0 to make it writable by all users.

You can add a udev rule to make USB ports be writable by all users by default. Make a file called 75-usb-rw.rules in /etc/udev/rules.d and add the following to it:

SUBSYSTEMS=="usb", KERNEL=="ttyACM[0-9]*", MODE="0666"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB[0-9]*", MODE="0666"
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Asked: 2012-10-23 06:33:09 -0500

Seen: 1,093 times

Last updated: Dec 03 '12