Half a croissant, on a plate, with a sign in front of it saying '50c'
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laser distance measuring app

LDMA - laser beam measured distance from cellphone
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LDMA - laser beam measured distance from cellphone laser beam from cellphone can measure from one point to another through calibration points
Seneca, Apr 09 2013

Acoustic Ruler http://gizmodo.com/...ne-like-a-submarine
[DIYMatt, Apr 10 2013]


       //laser beam measured distance from cellphone laser beam from cellphone//   

       So, a hybrid between two cellphones and two laser rulers?
MaxwellBuchanan, Apr 09 2013

       Erm, do mobile phones come with lasers these days? <cuts to people doing Vader/Skywalker impressions>
not_morrison_rm, Apr 10 2013

       As [not Morrison rm] annotates, a laser rangefinder cellphone app is troubled by the fact that most cellphones don’t have the needed built-in hardware – a laser. They all do, however, have speakers and microphones, so should be capable of running an acoustic rangefinder. OLPC XO-1 laptops came with such an app. Acoustic rangefinders have much shorter range than laser rangefinders, though.
CraigD, Apr 10 2013

       ^That's baked, linky.
DIYMatt, Apr 10 2013

       The acoustic ruler thing doesn't work very well, has to be said.   

       Personally, I'd sooner have an IR LED on my smartphone than a laser, with apps to duplicate various remotes. I have a Re remote plug-on for my iPhone, but it's a cumbersome alternative to a simple IR LED.   

       Actually, that gives me an idea...
MaxwellBuchanan, Apr 10 2013

       Smart phones have GPS, so distance between two should be determinable to plus/minus a couple of meters. Is the laser idea to do better than that? If so, need to specify precisely how it would work. [withholding+]
sqeaketh the wheel, Apr 10 2013

       I think the Apple Newton had an IR diode ... you could teach it to emulate any IR remote control.
spidermother, Apr 11 2013

       How about a smart-phone which fires very small rockets?   

       Simply fire one of the small rockets (with a teeny black-powder+magnesium warhead) at the distant object/person, compare the impact flash/sound of small explosion to get the distance.   

       Can be done in Android, iPhone or Katyusha (for the prolific measurer).
not_morrison_rm, Apr 11 2013


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