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I was lucky enough to be bought a visualiser for my classroom. If you've never come across them before - they are essentially a piece of hardware that replaces OHPs and other projection equipment. 

In class, they are used to project what is on the teachers desk onto a whiteboard. 

They have some nice features - save video and still images of whats being projected, they can connect up to microscopes and you can freeze the displayed image.

All good stuff -- but they cost between £150 and £250 ($200 - $400 ish). 

Having a spare web cam, I thought I could recreate one for £15 - £20 ($20 - $40).

You'll need:
 

  • USB Web Cam
  • Flexible neck desk lamp (cheaper the better as you'll be re-purposing it)
  • Software (the excellent MyScreenCam is perfect and free)
  • Basic tools (Dremmel / hand drill, screw drivers)

Step 1: Tear Down Web Cam / Lamp

Start with making sure that your WebCam works with your computer.  Install any drivers that you need.

Then grab the excellent software MyScreenCam and install it (I have Windows 7 and it works a treat) 

1) Tear down the lamp

i)   Remove the inside of the lamp shade
ii)  Remove any electrical wires
iii) Unscrew the lamp shade from the flexible neck

2) Tear down the web cam

i)   Remove any leg / stand from the camera body.
What we are aiming for is just the camera.

Step 2: Modify the Lamp Shade

We are aiming to insert the web cam into the shade, so we need a hole in the shade big enough to take the USB connector and the ferrite core.

Enlarge the central core with whatever tools you have to hand.  A drill bit / dremmel would be best.

Thread the USB cable through the shade, remembering that the camera wants to site inside the shade.

Step 3: Reasemble and Test

Reattach the shade to the flexi neck.

(In my case, the web cam fitted so snugly that I did not glue it in there - you may need to attach the camera with some hot glue)

Plug in the USB cable and fire up the software.

Step 4: Conclusion

I now have a £20 visualiser that the software allows me to project and capture the video output.

It does 80% of the functions of my Promethian for £20 as opposed to £200.

As allways, your mileage may vary.
Great idea and nice instructable!
This would me great for taking pictures for instructables. Better then using my phone anyway.
This is so simple and inexpensive. Brilliant. Why isn't this garnering more comments and application from parents and grandparents who want their children interested in the world around them. Great job and thanks. I'm doing this in the am
One or two more photos would make for a few more comments.<br> Suggest an image of the project in use, example- a butterfly on the table with the image projected on the wall at the same time.
Brilliant!

About This Instructable

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Bio: Head of Science in a busy High School, Web 2.0 geek, husband to a wonderful wife and father to two lovely kids.
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