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Turtlebot bringup minimal.launch, cannot find create on dev/ttyUSB0

asked 2012-03-15 05:44:21 -0500

IFLORbot gravatar image

updated 2014-01-28 17:11:39 -0500

ngrennan gravatar image

Every day I start up my turtlebot, I have the same problem with minimal.launch. Every day, I have to fix it, seemingly through random chance. I get it working, but it takes a significant amount of time everyday. I've looked through every post on the subject many times, and have added rules to give permissions to udev, but every day I have the same problem and simply have to get lucky in reboot.

Even if the create USB is assigned USB0, sometimes it doesn't work.

Can I go in and change the minimal launch so that it's looking for a SYNNAME for create instead of just looking at ttyUSB0?

Then making a rule in udev/rules.d like this:

KERNEL=="ttyUSB*", SYSFS{idVendor}=="0403", SYSFS{idProduct}=="6001", SYSFS{serial}==SERIAL_OF_USB_CABLE, SYMLINK+="turtlebot"

So my real question is if I do this in minimal.launch, are there going to be problems in the code later where instead of looking for turtlebot, the code is simply looking for ttyUSB0.

Thanks

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Comments

Are you stopping the turtlebot service before running minimal.launch?

Ryan gravatar image Ryan  ( 2012-03-16 20:16:25 -0500 )edit

4 Answers

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answered 2012-03-15 06:30:58 -0500

tfoote gravatar image

The turtlebot_node has a parameter for what the port is. You will have to modify the launch file to set that parameter differently if you want to change the port name.

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answered 2012-03-15 09:40:17 -0500

IFLORbot gravatar image

Thanks. I might just do that and see if it works better.

Right now, I'm still just having problems with the minimal.launch working when the create is correctly at ttyUSB0. I mostly just don't understand what I could be missing as every day, exactly no change can either cause it to work, or not work. And I do have other devices plugged into my Turtlebot, but minimal.launch has worked fine with them before.

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answered 2012-04-04 05:59:20 -0500

mozer gravatar image

I have this same problem. ubuntu 11.10. ros electric

tully: you have missed the point with your response. the currect port is there - just not providing data

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Comments

These may be different problems. If you have the right port set and nothing is working it might be hardware. I would suggest using kermit to connect to the serial port at 57600 baud and power cycle the create. If the hardware is working it should display something.

I Heart Robotics gravatar image I Heart Robotics  ( 2012-04-07 08:20:05 -0500 )edit
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The ckermit connands are "set line /dev/ttyUSB0", "set speed 57600", "set carrier-watch off","connect". After that power cycle the create.

I Heart Robotics gravatar image I Heart Robotics  ( 2012-04-07 08:21:57 -0500 )edit
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answered 2012-03-16 19:53:33 -0500

I Heart Robotics gravatar image

We are working on some of the serial port issues.

You may want to try out the config script attached to this patch. https://kforge.ros.org/turtlebot/trac/ticket/125

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Asked: 2012-03-15 05:44:21 -0500

Seen: 1,141 times

Last updated: Apr 04 '12