my watch does not like my tattoo any help?

Discussion in 'Apple Watch' started by steve knight, Apr 19, 2018.

  1. steve knight macrumors 68020

    steve knight

    Joined:
    Jan 28, 2009
    #1
    I had to change my watch over to to my right wrist because of a wrist brace and it has a tattoo and the watch keeps locking.
    image1.jpeg
     
  2. StarShot macrumors 6502a

    StarShot

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    Mar 31, 2014
  3. danny842003 macrumors 6502a

    danny842003

    Joined:
    Jun 6, 2017
    #3
    I think tattoos are a known limitation of the Appel watch. It uses LEDs and the pigment in the ink absorbs the light differently to what it is expecting.
    You can turn the lock off which will solve the issue although it will disable some features.
     
  4. steve knight thread starter macrumors 68020

    steve knight

    Joined:
    Jan 28, 2009
    #5
    I am enrolled in that heart study. I will try the sticker. this thing made the change happen. if I can keep it on the other side of my wrist bone it works. may have to get one of those sport loops to keep it in place. IMG_0717.jpg
     
  5. Relentless Power macrumors Penryn

    Relentless Power

    Joined:
    Jul 12, 2016
    #6
    This is incorrect. Its not absorbtion, Its reflection based. The Apple Watch uses photoplethysmography, which essentially enables the rear LED sensors distribute light towards your skin and measure the skin, which immediately reflects back. If there is no reflection or little reflection, Passcode is engaged. Hence, dark tattoo's have very little reflection due to the dark ink.

    The other two sensors are illumination sensitive photodiodes, which detect reflected light from your arms blood vessels and as a the heart beat is happening, the blood flow is occurring and the green diodes absorb the light to distinguish between beats as the reflection differentiates.
     
  6. Mishabella macrumors member

    Joined:
    Apr 2, 2011
    Location:
    Cali
    #7
    I’m going to straight up apologize for the useless post that follows this message.

    Omg! Keep talking nerdy tech to me!

    I’m sorry. I had to.
     
  7. danny842003 macrumors 6502a

    danny842003

    Joined:
    Jun 6, 2017
    #9
    So what happens to the light energy that isn’t reflected back?
     
  8. Relentless Power, Apr 20, 2018
    Last edited: Apr 20, 2018

    Relentless Power macrumors Penryn

    Relentless Power

    Joined:
    Jul 12, 2016
    #10
    I explained this. Its being blocked by the dark ink. The reflection is being directly blocked, which can’t achieve a proper reading or accurate measurement, nothing specifically has to “Happen”, Because of said reasons. It negates the reflectivity and measurements are not quantified or read properly. Any light is essentially is being “Un-used.”
     
  9. danny842003 macrumors 6502a

    danny842003

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    Jun 6, 2017
    #11
    Dark colours absorb light hence why it isn’t reflected.
     
  10. Relentless Power macrumors Penryn

    Relentless Power

    Joined:
    Jul 12, 2016
    #12
    This is what you originally quoted:

    It uses LEDs and the pigment in the ink absorbs the light differently to what it is expecting..”

    Which is completely false, its NOT absorbed and you’re spreading misinformation . It was explained to you three times now that you don’t understand the sensor readings and the measurements is actually trying to read from the penetration of the skin which is being blocked by the reflection the ink from the actual contact point, it’s not absorbed. Please research photoplethysmogpahy versus arguing something you don’t understand. Also, the light energy from reflected back from the photodiodes past penetration isn’t providing a reading after the Initial delay, its simply un-used. Nothing happens, which is why the watch won’t unlock or provide an accurate heart reading. Also, some ink isn’t as saturated, which the reflection is able to penetrate past, but other dark colored area’s is far more problematic.
     
  11. danny842003 macrumors 6502a

    danny842003

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    Jun 6, 2017
    #13
    So your telling me tattoos don’t absorb light? Interesting.
     
  12. Relentless Power macrumors Penryn

    Relentless Power

    Joined:
    Jul 12, 2016
    #14
    Two things that are not mutually exclusive, in which case you don’t understand the context of the discussion, which was proven multiple times, yet you refute unrelated points already addressed.
     
  13. danny842003 macrumors 6502a

    danny842003

    Joined:
    Jun 6, 2017
    #15
    Reflected light and absorbed light are not unrelated though.
     
  14. Newtons Apple macrumors Core

    Newtons Apple

    Joined:
    Mar 12, 2014
    Location:
    Jacksonville, Florida
    #16
    Good grief. We can argue over anything these days.

    Off topic to the OP: Judging the looks of the tatoo, it is pretty dark.

    I also had to move my AW to my right wrist as my left wrist has carpel.

    Hope yours get well.
     
  15. JackieInCo Suspended

    Joined:
    Jul 18, 2013
    Location:
    Colorado
    #17
    I have two tattoos on my wrist area. with a small space separating the two. I can wear my watch in between the two and it works perfectly except for when the watch slips just a bit lower on my wrist. I had planned the original tattoo on my wrist with the idea that I could always hide it with a watch one day if I ever had to. That was 2010. Smart watches weren't a thing yet.
     
  16. steve knight thread starter macrumors 68020

    steve knight

    Joined:
    Jan 28, 2009
    #18
    The silicone disc did let the watch work but I could not get it to charge. Not that big of a deal. I got a sports loop to see if I could keep the watch on the other side of my wrist but it would slip after a bit.
     
  17. goobot macrumors 603

    goobot

    Joined:
    Jun 26, 2009
    Location:
    long island NY
    #19
    A green tattoo is probably one of the worst colors since it's green light that the sensors use.
     

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