new user of basic stamp

jatk

Hello all
I am a new user of basic stamp, so please if somebody can help me.
I have a project there I will have to know in with direction·I see with a camera.
I can not use any magnetic sensor because i will look down in a 20 meter long pipe, sometimes of steel ( the pipe is vertical).
I can calibrate the camera (in witch direction it points) before I send it down in the pipe.
Then I will know the new direction when·I rotate the camera down in the pipe.
Is there any how can help me with a program to and what device is best to go on.

Anders

Post Edited By Moderator (Joshua Donelson (Parallax)) : 2/19/2009 5:25:39 PM GMT

Chris Savage

Please use the pencil icon to the top right of your message to edit and add a subject so others will know what your message is about. Take care.

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Chris Savage
Parallax Engineering

remmi870

if you use a servo, you can set up a servo with a pot and make the pot go in the direction that the camera is going, if a servo wont work, you could also use a motor and gear assembly with a pot feedback and have the same pot setup for the master and slave setup, this will give you definite positioning, if you need to go more than the 200+ deg rotation of a pot, you could use some type of encoder on a motor and gear setup and use the debug window to show the degrees that it has traveled so you could get a idea of where it is, however the resolution may be 5-20 degrees off depending on your encoder.

ultimateremedy

Hi
Did you find any solution? if you did Please share.

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An hour's contemplation is better than a year's adoration.

skylight

This is a duplicated thread

http://forums.parallax.com/showthread.php?p=784261

stamptrol

How is the camera being put down the pipe? I'm assuming on the end of a cable, yes?

What is the diameter of the pipe?

Regards,

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Tom Sisk

http://www.siskconsult.com
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Carl Hayes

You could shine a polarized light beam down the pipe, and use multiple light sensors with polarizing filters on them, each at some angle to each of the others, and compare the intensities seen by these sensors to determine your angular position.

Or you could put the polarized sources on the camera, shine them up the hole, and do the sensing at the top.

If you're sensing at the top, three light sources could be of three different additive primary colors and you'd merge them and observe the resultant color, which would give complete information.

Or you could use a long Bowden cable from the camera to an angle encoder of some type at the top of the·hole, so that turning the camera would mechanically actuate the detector.

Or you could equip the camera with an encoding gyroscope.

I'm sure there are many other ways to do it.

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· -- Carl, nn5i@arrl.net

jatk

Hi All
It is not so easy.
The problem is, I have the camera in a more than 20 meter cable. ( I can't se down because it can be some small bend of the pipe) When i sink it down in the pipe the camera head are rotating because the wire is not in an right angel.
I must se how much it rotates while I get it down in the pipe. If I can get a reference position when the camera is up I will have the differences angel when its down and then I can say how many degree offset this will be.
I can not se anything than a Gyro that can take care of the angel.
But how to process the signal from the Gyro??

Hope that anyone have a solution for me.

Anders JATK

LilDi

Get a cheapo Cracker Jacks compass and mount it in front of the camera such that you can see the compass reading without blocking to much of your view.