Iphone proximity sensor (was: comparing Apples and Oranges $199 iPhone Freerunner GTA02)

[Federico Lorenzi]

Or you just use an infrared proximity sensor. I was thinking it might
be possible to do the same on the Freerunner with the accelerometers.

On 6/10/08, Raphael Wimmer <raphael.wimmer at ifi.lmu.de> wrote:
> On Tue, 10 Jun 2008 09:45:18 +0200, kenneth marken <k-marken at online.no>
> wrote:
>
>> On Tuesday 10 June 2008 07:37:33 Ron K. Jeffries wrote:
>>> -- larger physical screen size (but about the same  dpi?)
>>
>> i do belive the iphone is lower dpi as the GTA02 is smaller in size, but
>> higher in rez.
>>
>>> -- proximity sensor (knows when held to face, can dim screen)
>>
>> that is probably just the heat sensitive screen and some code that
>> basically locks out input ones a heat source with a surface area larger
>> then a couple of fingers are detected...
> [...]
>
> It's just the capacitive touch screen. I'm pretty sure no temperature
> sensor is involved. As you said ,you just measure the contact area between
> finger and screen (which is easily possible with capacitive touch screens)
> - and once the contact area gets larger than let's say 3cm you assume that
> your ear/cheek is in contact with the screen.
>
> Raphael
>
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