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Sliding Door Alarm

 Key Code Device with a sliding cover to prevent fingerprint lifting
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A Touch-screen based alarm can prevent finger-print lifting by swapping buttons randomly. However, this is inaccessible to blind people and has the further disadvantage that users cannot memorize the finger-motion used to deactivate the alarm. There are many ugly and possibly overpriced solutions (electric braille pins, sliding button surface pads). I propose something much simpler and cheaper:

A pair of plastic rollers could be used to house a rolling plastic sheet which would cover the keypad's buttons. Each time a code was successfully activated, the plastic would roll across the screen.

—aguydude, Nov 04 2010

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       Capacitative buttons could be designed to work without actual contact, ie. proximity only (miniature IR sensors are an alternative); so if you want to spend heaps, a 'non-contact' keypad could be done (I think...).
If the proximity buttons work well enough, the next stage is not to have a visible keypad at all; you just have to know where in the wall it is, and enter your PIN in mid-air.
—neutrinos_shadow, Nov 04 2010
   


 

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