Sensor on back opposite of camera?

Discussion in 'iPhone' started by idunk, Aug 4, 2009.

  1. idunk macrumors member

    Joined:
    Jul 24, 2009
    #1
    I'm not sure if this has been posted in another thread but i looked in the main sticky and didn't see anything on it.
    I was shining a flashlight on the plastic back of my 3GS and on the opposite side of the camera i noticed something that looks like the sensor holes on the front.
    Does anybody know what this might be for?
     
  2. TheNewsPaperBoy macrumors regular

    TheNewsPaperBoy

    Joined:
    May 10, 2009
    Location:
    Florida
  3. bruinsrme macrumors 601

    bruinsrme

    Joined:
    Oct 26, 2008
    #3
    sensors on the front are for light levels for auto brightness
     
  4. aprofetto macrumors 6502a

    aprofetto

    Joined:
    Dec 19, 2008
    Location:
    Hamilton, Ontario
    #4
    Hmm... I remember seeing a post when the 3G came out, something about a chip or sensor being visible through the black plastic with a black light or something...

    Can anyone confirm this?
     
  5. tsvb macrumors 6502

    Joined:
    Jan 28, 2006
    Location:
    Syracuse, NY
    #5
    There are three sensors on the top left hand side of the 3G. I assume one is the ambient light sensor and one is the proximity sensor but I am not sure what the other is.
     
  6. mac2thefuture macrumors 65816

    Joined:
    May 15, 2007
    Location:
    Lancashire, North West, UK
    #6
    In certain natural light conditions I too have seen 3 slightly purple circles on the front opposite the camera, in an 'L' shape if you will.
     
  7. iMacDragon macrumors 65816

    iMacDragon

    Joined:
    Oct 18, 2008
    Location:
    UK
    #7
    I believe underneath that IR readable hole is the serial number 2d tag, for factory purposes.
     
  8. lemonademaker macrumors 6502a

    lemonademaker

    Joined:
    Jul 18, 2009
    Location:
    In a Van Down By The River! Metro Detroit!
    #8
    I was kind of wondering why my Otterbox defender had that xtra window to the left of the earphone where the "L" shape would be.... now i know....
     
  9. BNZ1 macrumors regular

    Joined:
    Nov 11, 2008
    Location:
    London
    #9
    IR Light (not on first gen), Proximity Sensor (uses IR light on 3G and 3GS, ambient light on first gen) and the auto brightness sensor.

    If you want proof hold the phone up to a video camera whilst on a call and watch the IR Led strobe as it puts out light for the proximity sensor.
     
  10. aprofetto macrumors 6502a

    aprofetto

    Joined:
    Dec 19, 2008
    Location:
    Hamilton, Ontario
    #10
    I've seen this in action once while on a call in the darkness of my backyard. Kind of cool.
     

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