Author Topic: Best sensor for detecting small and close objects  (Read 1700 times)

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Offline Weird FishesTopic starter

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Best sensor for detecting small and close objects
« on: April 03, 2009, 10:34:35 AM »
I am trying to figure out which type of sensor (and which model too, I suppose) would work the bet for detecting small objects (Lego bricks) on a white colour board by an autonomous robotic arm that will be approximately 5-10 cm from the ground(tip of sensor to board). What I don't know is whether a given sensor will be able to detect the brick, and be fairly accurate about it's position.

Any help would be greatly appreciated.

Offline Hawaii00000

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Re: Best sensor for detecting small and close objects
« Reply #1 on: April 05, 2009, 08:06:03 PM »
You might want to look into roborealm ( http://www.roborealm.com/ ). It uses a webcam and a laptop to process images. The other option is using a ir range finder like this...

[youtube]vbhMuPF0Qj4[/youtube]
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Offline SmAsH

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Re: Best sensor for detecting small and close objects
« Reply #2 on: April 06, 2009, 01:24:49 AM »
does this sensor need to detect the color or the distance of the brick? have you considered sonar?
Howdy

Offline superchiku

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Re: Best sensor for detecting small and close objects
« Reply #3 on: April 06, 2009, 03:37:22 AM »
hey if its coloured devce ..i can help u with image processing..i have devised a method for blob detection in opencv ...it really works gr8..and yes its faster then roborealm..
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Offline Weird FishesTopic starter

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Re: Best sensor for detecting small and close objects
« Reply #4 on: April 06, 2009, 03:12:39 PM »
It doesn't need to detect colour. I've built a colour sensor already, and if I decide to include it it won't be on the end of the arm. I just ordered a sonar sensor from Pololu that claims it can detect small objects up to and touching it's face. I also have an IR sensor, so maybe I'll pair them. The IR sensor wasn't working very well before, but I think the voltage was out of range.

As for the camera, I don't think that's the best fit for this project(at least for now). I'm using an atmega168 and have little camera experience. Maybe version 3(this would be version 2 :P).

Thanks

Offline GearMotion

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Re: Best sensor for detecting small and close objects
« Reply #5 on: April 06, 2009, 03:22:06 PM »
Perhaps think in stages. If you have a sonar sensor that gives you rough location, perhaps you can then supplement with a beam-break (IR or visible) sensor right on the robot arm.

 


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