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Kinect power - Create shutdown issue

asked 2011-07-27 02:40:08 -0500

xalu gravatar image

updated 2016-10-24 09:02:43 -0500

ngrennan gravatar image

Hi,

I am having some issues where my create is powering down after the kinect is on for a few minutes. I am worried it has something to do with my circuit I made http://www.ros.org/wiki/kinect/Tutori... . I could have something done incorrectly on the circuit. * The setup I currently have is what that tutorial shows. Coming off the create power outputs. *

I was wondering, since I am using a full ATX power supply can I just take a 12volt line and use that for powering my kinect? Is there any drawbacks issues. *My power supply is a DC power supply for car PCs. *

Thanks

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answered 2011-07-31 18:37:12 -0500

KoenBuys gravatar image

Experiments showed me the following:

Kinect can actually handle a small voltage swing pretty well. I had no problems with 11 to 13.5V although I would advice against it. Using a typical 7812 or LM1084-12 is the best option. Also a ATX output provides a stable 12V (sometimes they do need a minimal load). The kinect PSU is rated for 1 or 1.5A, but using the Kinect with camera + pointcloud only, I never got it above 500mA. However the current peaks can bring the robot down. (both lowering the battery voltage and draining the battery faster) This was not tested on an Create but on a Roomba. This is why we choose to sell our Turtlebots with a battery connection.

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I am having problem while connecting the kinect power using DB25 connector of Irobot create base. The connector circuit is designed by clearpath robotics to provide 12V DC power to kinect by taking power from pin 10 and 14 of DB25 connector of irobot create base.

lifelonglearner gravatar imagelifelonglearner ( 2013-07-26 00:09:48 -0500 )edit
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answered 2011-07-27 03:58:11 -0500

dornhege gravatar image

So what is your setup? How is your circuit powered?

I am assuming you take the regulator circuit from the wiki link and power that by the ATX supply's 12V line?

That probably won't work as the regulator wants >14.5V to get down to the regulated 12V. If you measure the output voltage I think you will observe something like 10V.

You can use another regulator (9-18V or 9-36V input voltages are quite common), but that might be more expensive or provide higher input voltage.

Using the 12V from the ATX might also work. I don't know how nicely regulated the ATX voltage is.

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A fully charged battery is giving me 19 volts. The regulated output comes out to something like 16 volts. Shouldn't that be correct? A fully charged battery is always a few volts higher.
xalu gravatar imagexalu ( 2011-07-27 04:05:48 -0500 )edit
That is NOT correct. The regulated voltage (under load) for 19V in should be 12V. If you measure 16V as the voltage that goes into a connected Kinect this will very probably destroy it!
dornhege gravatar imagedornhege ( 2011-07-27 04:18:46 -0500 )edit
Okay so my circuit is at fault. I'll try my atx power supply.
xalu gravatar imagexalu ( 2011-07-27 04:20:03 -0500 )edit
I'm not sure about the behavior of the regulator. Without a load the voltage might be higher. If you connect a load and it shows 16V there is something faulty.
dornhege gravatar imagedornhege ( 2011-07-27 04:24:58 -0500 )edit
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answered 2011-07-27 04:08:02 -0500

xalu gravatar image

I'll try the 12v ATX power and see what happens. Its suppose to be about 1.5 amps coming off of a standard atx power cable. I can verify with manufacture.

This should be the correct power settings for the kinect (12volt 1.5 amps) ?

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I'm sure a standard ATX power supply provides enough power for a kinect. The 12V line (yellow) should be the one to use. I would more be worried about the 12V being actually 12V
dornhege gravatar imagedornhege ( 2011-07-27 04:20:54 -0500 )edit

I am having problem while connecting the kinect power using DB25 connector of Irobot create base. The connector circuit is designed by clearpath robotics to provide 12V DC power to kinect by taking power from pin 10 and 14 of DB25 connector of irobot create base.

lifelonglearner gravatar imagelifelonglearner ( 2013-07-26 00:09:41 -0500 )edit

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Asked: 2011-07-27 02:40:08 -0500

Seen: 1,086 times

Last updated: Jul 31 '11