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I used a Raspberry Pi along with a PiRack, a Raspberry Pi camera module, a portion of a Pi Cobbler Kit, and a white LED to create a document camera for use in a high school classroom.  Document cameras typically cost hundreds of dollars.  Public school budgets are tight these days.  This RPi + PiRack + RPi camera module is an affordable solution that works with existing classroom technology (the projector that is already installed).  From the command line: sudo raspivid -t 0 ...
Adding analog and digital interface card to Pi with remote control via Internet with Java or Bluetooth for local mobile access with same controls. ...

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