Apple Watch και tattoo. Μια πονεμένη ιστορία… [Update με επιβεβαίωση από την Apple]

Posted on Wednesday April 29th, 2015 / 19:44

Προβλήματα στη χρήση του Apple Watch φαίνεται πως δημιουργεί η ύπαρξη τατουάζ στα χέρια των χρηστών:

So I thought my shiny new 42mm SS watch had a bad wrist detector sensor. The watch would lock up every time the screen went dark and prompted me for my password. I wouldn’t receive notifications. I couldn’t figure out why especially since the watch was definitely not losing contact with my skin. also I couldn’t find anything online with people experiencing this issue. I was about to give up and call Apple tomorrow when I decided to try holding it against my hand (my left arm is sleeved and where I wear my watch is tattooed as well) and it worked. My hand isn’t tattooed and the Watch stayed unlocked. Once I put it back on the area that is tattooed with black ink the watch would automatically lock again. Just wanted to give anyone a heads up about this issue because I don’t see it mentioned anywhere in Apple’s support documents.

EDIT: upon further testing it seems like notifications in general won’t come through unless it senses it’s on your skin. So when my friend texts me and the watch is on my wrist my phone shows an incoming text…when I move the watch to the top of my hand which is not tattooed the watch gets notifications.

EDIT 2: by turning off wrist detection messages are being pushed to the watch now. I believe this will hinder apple pay though because I can’t use the password (because the watch can’t detect my wrist), but at least it’s working now.

Οι σένσορες του Apple Watch φαίνεται πως αδυνατούν να καταλάβουν την επαφή με το δέρμα καθώς το μελάνι του του τατουάζ προκαλεί λανθασμένες μετρήσεις:

Oxyhemoglobin has several local peaks of absorbance which can be used for pulse oximetry: one green, one yellow, one infrared, etc. Apple uses the ones at infrared and green parts of the spectrum. Now, here’s some key facts. Melanin and ink are both equally good at absorbing frequencies over 500nm, which sadly includes the green. But, melanin’s absorbance falls down so rapidly that by the infrared end of the spectrum its hardly absorbing anything at all. That, combined with the fact that Apple adjusts the sensitivity/light level dynamically means infrared is probably black people friendly. Ink has a much more gradual fall off, so even infrared might not work for them.

Αν λοιπόν έχετε κάποιο tattoo στο καρπό σας καλό θα ήταν να μην προχωρήσετε στην παραγγελία του με κλειστά μάτια αλλά να δοκιμάσετε το Apple Watch για να διαπιστώσετε αν λειτουργεί όπως πρέπει.

Update (01-05-2015) με επιβεβαίωση της αναφοράς από την Apple:

Permanent or temporary changes to your skin, such as some tattoos, can also impact heart rate sensor performance. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings.

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About Vasilis Ananiadis

Ο ζωντανός θρύλος της Ελληνικής blogόσφαιρας, ο αβυσσαλέος master του SEO, o πρίγκηπας των Social Media, ο τυφώνας των Web Startups, ο οργασμός της ιντερνετικής επιτυχίας. Τώρα και στο twitter: @vananiadis


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