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electroaudio's Avatar
Posts: 379 | Thanked: 325 times | Joined on Jan 2011 @ Stockholm, Sweden
#11
Originally Posted by viic View Post
hi, using the infrared port anyone can create an application for measuring a room.
The apps must to sell a IR signal and then start a timer...the signal bounce on the wall and return to the IrDA...the application can stop the timer and using the timer we can calculate the distance between the wall and the phone!
IR-light moves with a speed of 299792.458 kilometers each second so you really need to speed up the N900 too
But if it is a silent room then maybe a soundpulse and a measurement of the reflected echoes could guve a much more accurate reading, since sound only travels 340 meter on a second.
 

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#12
 

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#13
I've thought about using the lense focus length to measure stuff - it's extremely simple math (rudimentary geometry and algebra) to calculate it from there.

But at least using the Camera UI replacement included in CSSU, I have not seen the measurements to be too reliable... I've pointed it at a wall and focused, then mesures the actual distance from camera to wall, and there's definitely almost always some discrepancy. Though the Metre App linked to earlier seems to have implemented what I'm talking about already, and decently well. *Shrug*
 

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#14
Proximity sensor?
It really needs to be something that gives off a single point beam rather than an arc to avoid other items in the vecinity, like items of furniture etc.
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Mick has just punched the cr@p out of the "Unlike" button on the Official Nokia Facebook Page.
 

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#15
IrDA in N900 is only transmitter, so you cannot receive the return signal
 

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#16
Originally Posted by hatem0 View Post
IrDA in N900 is only transmitter, so you cannot receive the return signal
One mentioned the speed of the IR light and the speed of the N900.

Beside that the camera "can see" the IR blinking of a remote control in visible light (I do not know why this is the case). Just try to make
a photo of a remote control's IR transmitter in action.

So you could mount a mirror at the wall and measure the time
N900 IR -> mirror -> N900 camera.
The problem will be the focusing on the tiny blinking dot and the
speed to measure.
 

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#17
bluetooth headset mic + phone speakers let you measure the distance between headset and phone.

It works with a wired mic too, but then it's easyer to measure the length of the wire.
 

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#18
Originally Posted by PMaff View Post
and the
speed to measure.
You have the time of 4 processors clocks per meter of what you want to measure. Hope you are a good coder, because the linux kernel isn't real time
 

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#19
Originally Posted by johnlf View Post
combine with n900fly, just throw your n900 across the room, and when it hits the wall you should have your measurement! :d

good idea.......
 

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#20
Out of curiosity... Even if you were to make the IRnode register distances as great as a room, how would you be able to ensure that your line/beam is level without the internal compass?
 

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