Auto-Brightness Sensor

Discussion in 'iPod touch' started by DJMORGAN, Sep 30, 2007.

  1. DJMORGAN macrumors newbie

    Joined:
    Sep 25, 2007
    #1
    I was wondering if anyone can see the little dark grey dot on the top part of the iPod Touch. It sits in line with the right most edge of the safari icon.

    The only reason I am posting about it is that I never noticed it before and was finishing off my daily screen clean and thought it was a piece of dirt or worse that I had somehow damaged the inside of the iPod.

    If anyone else can see this then i will be convinced that it is the auto-brightness sensor and I have not damaged my iPod from too much cleaning. ;)
     
  2. Zwhaler macrumors 603

    Zwhaler

    Joined:
    Jun 10, 2006
    #2
    Yes, it is a sensor. But it doesn't seem to do anything (even with the auto brightness option turned on). I try covering it when it is bright outside... it doesn't even notice.
     
  3. sundayx macrumors member

    Joined:
    Sep 15, 2007
    Location:
    Hong Kong
    #3
    Yeah I'm trying to figure out the effectiveness of the sensor, it works, but not very sensitive nor effective.
     
  4. aswitcher macrumors 603

    aswitcher

    Joined:
    Oct 8, 2003
    Location:
    Canberra OZ
    #4
    Yeah, mine doesn't seem very sensitive - possibly not even working.

    In a darkened room a bright light shone on it for 30 seconds and then removed didn't make the screen brighten. Lights all off does nothing either...
     
  5. nlivo macrumors 6502a

    Joined:
    Jun 18, 2007
    Location:
    Ballarat, Australia
    #5
    I read somewhere that it only detects the light when you turn it on (or unlock it).....
     
  6. aswitcher macrumors 603

    aswitcher

    Joined:
    Oct 8, 2003
    Location:
    Canberra OZ
    #6
    That would make sense to conserve battery life...
     
  7. iShak macrumors 6502

    Joined:
    Dec 26, 2006
    #7
    .. hahahaha ... priceless .. I hope you were being sarcastic ..

    the sensor is there to save the battery by turning down the screen brightness when in dark areas, wouldn't iPod save more power when the sensor is actually on and adjusting the brightness real time than having it off to save whatever pico watts it might be using?

    on-topic: yeah .. mine seems to be very very lazy as well
     
  8. SirCrumpet macrumors regular

    SirCrumpet

    Joined:
    Jun 9, 2007
    Location:
    Brisbane, Australia
    #8
    no, he actually has a point - the constant sampling and adjusting of the brightness would effectively nullify any advantage to battery life by reducing the brightness.
     
  9. aswitcher macrumors 603

    aswitcher

    Joined:
    Oct 8, 2003
    Location:
    Canberra OZ
    #9
    So it samples when your using it but when you leave it playing it doesn't bother since it assumes your not moving about...
     
  10. colto macrumors regular

    Joined:
    Sep 9, 2007
    #10
    No. When you leave it playing the screen turns off lol. But whenever you turn it on after that it resamples the light intensity and feeds the value to the processor and the amount of power to the LCD is computed.
     
  11. savar macrumors 68000

    savar

    Joined:
    Jun 6, 2003
    Location:
    District of Columbia
    #11
    Umm..it just has to sample an ADC once or twice every second. The power consumption must be minute. Especially since the ADC is probably built into their microcontroller.

    I can't get it to respond ot the sensor at all.

    I thought the whole point (this is how iphone is described anyway) is that if the ipod is in your pocket it should automatically set the brightness very low...
     
  12. Laurent macrumors regular

    Laurent

    Joined:
    Apr 27, 2003
    Location:
    Montréal, Québec
    #12
    I think the sensor is trigered only once when you perform certain action (playing a movie, switching from Cover Flow to normal view, etc.) I noticed that when I changed the international settings of my iPod touch (from English to French, back and forth), it adjust the brightness of the screen to be darker. It seems that when the iPod is waking up, it starts with a darker screen and slowly turn it brighter after a minute or two...
     
  13. iShak macrumors 6502

    Joined:
    Dec 26, 2006
    #13
    I *think* its just a photo diode so it really wouldn't consume any power, its the micro controller that will consume power when computing input from the sensor, and that would almost be negligible.
     
  14. jepaz macrumors regular

    Joined:
    Oct 1, 2007
    Location:
    USA
    #14
    I think it's turning itself up when in dark areas. That's how my touch is behaving. And so I'm re-adjusting the brightness because it's so bright!
     
  15. madmaxmedia macrumors 68030

    Joined:
    Dec 17, 2003
    Location:
    Los Angeles, CA
    #15
    Mine seems unpredictable too. But it really should be dimming when you're in dark areas, and turning up the brightness in well-lit areas.
     

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