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Post by Village Idiot on Oct 19, 2014 13:13:03 GMT -5
I'm guessing the answer is yes. I work with a visually impaired sixth grade student who is beyond bright, and his goal this years is to invent a portable CCTV using an iPad with a magnifying app. This is a CCTV:  So far he has been gathering materials, including a goose-neck lamp that will clamp to the side of a desk, like this:  He has taken the lamp part off and is figuring out how to enforce the strength of the neck to hold the weight of the iPad (another question), and how to attach the iPad quickly to the end of the neck. What would be perfect is a magnet, like the kind people use for picking up nails:  But I don't want the kid trying this and ruining his iPad. I will, won't it? |
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Post by epaul on Oct 19, 2014 13:22:24 GMT -5
In "Breaking Bad", Walter and Jesse used a strong magnet to erase all the data on an incriminating laptop. Besides erasing the hard drive, the magnet caused a tricycle to crash into a wall and tipped over a panel truck.
Be very careful around strong magnets.
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Post by millring on Oct 19, 2014 13:29:50 GMT -5
I'm not sure, but I'll ask Walter Egan.
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Post by Lonnie on Oct 19, 2014 13:51:12 GMT -5
I did some investigation. Apparently, household magnets won't harm a computer. Scientific or lab grade magnets probably will. Still, perhaps you could come up with a velcro solution. There are also mic stand and wheel chair gooseneck clamps for tablets.  |
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Post by TKennedy on Oct 19, 2014 14:07:31 GMT -5
Just an aside-
In 1971 I spent a year with a heart surgeon. We did a lot of pacemakers and each came with a really strong 3" doughnut shaped magnet used to activate internal switches after implantation.
I would take them home for the kids to play with.
One day I came home and the color TV looked like a tie-dyed T-shirt.
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Post by Supertramp78 on Oct 19, 2014 14:12:10 GMT -5
The case for the iPad is aluminum. A magnet won't stick to it.
like above, there are solutions out there already
Look at this guy on Amazon
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Post by RickW on Oct 19, 2014 15:06:06 GMT -5
Yup, reinventing that particular wheel, Todd. Magnets are bad for hard drives, as they use magnetism to store data. Solid state drives, such as exist in tablets, not so much. But I don't know what having a low level magnet attached to an electrical device will do over the long term.
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Post by epaul on Oct 19, 2014 15:44:37 GMT -5
I once sewed a magnet into the waistband of my pajamas... didn't help.
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Deleted
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Post by Deleted on Oct 19, 2014 15:56:43 GMT -5
Alnico or ceramic magnets that are common in household use won't hurt the iPad unless kept in direct contact for a period of time. Rare Earth magnets can hurt any device if they are within several feet. This will depend on size, I have quite a few 1" x 1/2" x 1/4" RE magnets in the shop and they will react to other magnets or metal objects up to 8" away. A 3" RE magnet could easily react to a ferrous object 3' away.
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Post by millring on Oct 19, 2014 16:18:58 GMT -5
I once sewed a magnet into the waistband of my pajamas... didn't help. Probably could use an iron bushing. |
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Post by Supertramp78 on Oct 19, 2014 16:41:17 GMT -5
Ahem,,,,, The case for the iPad is aluminum. A magnet won't stick to it.
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Post by j on Oct 19, 2014 16:46:13 GMT -5
I would use dual lock or heavy duty velcro; can be detached, but would require prying.
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Post by Deleted on Oct 19, 2014 17:55:18 GMT -5
Ahem,,,,, The case for the iPad is aluminum. A magnet won't stick to it. Doesn't have to Cheney. The extremely strong field of a rare earth magnet can affect the small magnetic components of the different drives. All it has to do is be in range. |
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Post by Village Idiot on Oct 19, 2014 19:19:47 GMT -5
Yup, reinventing that particular wheel, Todd. It would appear so, but that's not the case. While there are a lot of good stands out there made to comfortably view something that is happening on the screen itself, such as lyrics or GPS, none of them work very well for viewing things that are magnified through the camera lens. Keystoning  becomes a huge issue, as does the ability to glide an open textbook under it without the stand getting in the way while the person sits comfortably, and people need to be able to write under it as well. In other words, the kid's goal is to get away from this  while manuevering a large textbook at the same time. |
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Post by Supertramp78 on Oct 19, 2014 19:38:57 GMT -5
Ahem,,,,, The case for the iPad is aluminum. A magnet won't stick to it. Doesn't have to Cheney. The extremely strong field of a rare earth magnet can affect the small magnetic components of the different drives. All it has to do is be in range. There are no drives in an iPad. It is a solid state device. Lots of chips that probably don't want to be pulled on so much as to support the weight of the entire device, assuming there is enough ferrous substances in the chips. |
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Post by Village Idiot on Oct 19, 2014 19:43:55 GMT -5
Whatever you said, Tramp, I tend to agree.
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Post by mccoyblues on Oct 20, 2014 8:43:53 GMT -5
The magnet would probably harm the screen more than the internal electronic components. Even a small magnet will distort a standard CRT TV screen. Don't know what the effect is on an LED screen.
Can't you just write an APP that super-magnifies the image on the screen with no external device at all.
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Dub
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Post by Dub on Oct 20, 2014 11:27:06 GMT -5
So help me understand this. In the picture of the girl using a CCTV, is there a lens pointing down at the book? And is the image from that lens what is being magnified for display on the screen?
If my understanding is correct, then an iPad, by itself isn't going to work because the camera and the screen are in the same plane, not at 90° to each other. Maybe I'm missing something. That happens more than it used to.
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Post by brucemacneill on Oct 20, 2014 13:45:40 GMT -5
So help me understand this. In the picture of the girl using a CCTV, is there a lens pointing down at the book? And is the image from that lens what is being magnified for display on the screen? If my understanding is correct, then an iPad, by itself isn't going to work because the camera and the screen are in the same plane, not at 90° to each other. Maybe I'm missing something. That happens more than it used to. He'd need some kind of periscope-ish mirror to make the 90 degree reflection into the camera. I don't know how distorted that would be of course. That would also invert the image, I suspect, but he should be able to reverse that with the display software. I use Velcro picture hanger things and they'll hold a lot of weight. I don't really thing a magnet would hurt a tablet but Velcro certainly won't and they're removable. |
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Post by Deleted on Oct 20, 2014 14:01:59 GMT -5
The type of magnet usually used in a pick up tool is ceramic and no danger to the iPad unless it is in direct contact. |
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