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robotis.launch trouble finding AX 12 dynamixel motors

asked 2013-03-12 04:27:08 -0500

Rizqa gravatar image

updated 2013-03-12 04:30:28 -0500


I am trying to run pi_tracker.. But,when I use "roslaunch pi_tracker robotis.launch" I encounter none of the motors are detected..

I have tried to detected the motors using the dynamixel_motor package and can successfully detect and identify motors.

Currently I am connecting 3 motors(id 1, 6, 7). The usb2dynamixel is currently set to TTL..

How could this problem solved ?

Thank you...

Installed: ubuntu 11.10 x32 electric pi_tracker pyserial


[INFO] [WallTime: 1363075666.690905] Pinging motor IDs 1 through 25... [INFO] [WallTime: 1363075667.065507] Found motors with IDs: [1, 6, 7]. [INFO] [WallTime: 1363075667.225608] There are 3 AX-12+ servos connected [INFO] [WallTime: 1363075667.226162] Dynamixel Manager on port /dev/ttyUSB0 initialized


RuntimeError: lib_robotis: Error encountered. Could not find ID (1) on bus (/dev/ttyUSB0), or USB2Dynamixel 3-way switch in wrong position.

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answered 2013-03-12 17:15:47 -0500

Pi Robot gravatar image

updated 2013-03-13 03:17:44 -0500

Hi @Rizqa,

If you are using the current version of the robotis package from here, then it appears that it is no longer reading ROS parameters to set the baudrate and port. The defaults are 57600 for baudrate and /dev/ttyUSB0 for the port. You probably need to change the baudrate to 1000000 which you can do by editing the file:

$ roscd robotis/src/robotis

Then edit the file and change the baud rate to 1000000. This worked for me.


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Thanks.. it works fine.. :)

Rizqa gravatar image Rizqa  ( 2013-03-12 20:19:02 -0500 )edit

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Asked: 2013-03-12 04:27:08 -0500

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Last updated: Mar 13 '13