L'Oreal have launched a Wi-Fi enabled hairbrush, which is an IoT device. Image of Wi-Fi hairbrush I am wondering how I can repurpose it.

I am looking for serious suggestions as to how I could modify it, or connect it to other IoT devices, like Alexa or Raspberry Pi, or services (including IFTTT and MQTT).

[Edit] bonus marks for any solution involving a drone. [Edit 2] or direction finding jeans

What extreme or Rube Goldberg use can I put it to?

For those into hardware mods (all hail, Bunny Huang) that the brush contains the following:

  • A microphone
  • 3-axis load cells that measure the force applied to the hair and the scalp when brushing
  • An accelerometer and a gyroscope
  • Conductivity sensors to determine if the brush is being used on dry or wet hair

(hmmm, very surprisingly, we do not have a tag yet. Is it needed? It probably soon will be)

[Update] I will offer a bonus to anyone who can modify it to mine BitCoin :-)

  • 1
    Very amusing question! Is there any use-case in particular you're interested in, or are you open to any option to repurpose the hairbrush?
    – Aurora0001
    Jan 7, 2017 at 14:38
  • 1
    I am open to anything. We stand at the dawn of the era of the IoT; I an not certain that we have even begun to comprehend the possibilities and hope to explore them with this question.
    – Mawg
    Jan 7, 2017 at 14:40
  • 2
    Well, you might be able to cluster some of them, but only running uClinux I suspect... Jan 7, 2017 at 14:47
  • 2
    With an accelerometer, it could surely be used as a controller to play wii tennis.
    – AShelly
    Jan 7, 2017 at 21:24
  • 3
    Too bad the date of the press release, "04.01.2017" was probably not intended for a US audience :-( Jan 7, 2017 at 22:10

3 Answers 3


My first thought is that when I am getting ready to go somewhere on business, I can say "Alexa, when I have finished brushing my hair, please find me an apartment in Timbuktu using AirBnB, then book me a flight and an Uber ride to the airport and arrange for a drone to deliver the tickets to me wherever I am by tracking the location of my FitBit and don't forget to program my direction finding jeans to get me from Timbuktu airport to the apartment".

I am wondering how I can use the hairbrush for security while I am away. Perhaps if I leave it temptingly before a well lit mirror(1) with a comfy chair before it, any burglar might be tempted to brush his hair(2) and the brush could notify me?

Maybe I could IFTTT it to the security camera and the alarm system (or my Samsung TV ;-)?

(1) a smart mirror, of course

(2) 86% burglars are notoriously vain (and 73.62% of statistics are simply made up on the spot (or so 63.12% of people believe)).


At first glance, I was expecting the brush itself to be powered by a motor, which would have provided lots of scope for reusing the device. Disappointingly, this doesn't seem to be the case - the hairbrush still requires you to manually brush your hair, but it does have an awful lot of sensors to take advantage of:

The Kérastase Hair Coach Powered by Withings minimizes these risks, taking advantage of multiple sensors that provide information on the quality of hair and brushing patterns. These include:

  • A microphone that listens to the sound of hair brushing to identify patterns, providing insights into manageability, frizziness, dryness, split ends and breakage.
  • 3-axis load cells that measure the force applied to the hair and the scalp when brushing.
  • An accelerometer and a gyroscope which help further analyze brushing patterns and count brush strokes, with haptic feedback signaling if brushing is too vigorous.
  • Conductivity sensors to determine if the brush is being used on dry or wet hair in order to provide an accurate hair measurement. The brush itself is splash proof.

(from the Press Release you linked)

With this information, I think there's a lot of choice for what to use the brush for. New Statesman has a rather nefarious idea for what could be done:

Munro hasn’t yet looked at the Hair Coach, but he speculates about the security of any IoT device with a microphone and internet connection. “Listening to hair breakage requires a microphone, so can it hear more than just breaks? It’s clearly very sensitive, so could it detect human voice and potentially become a spy bug?”

You could, in theory, take advantage of the hair brush's microphone to act as a sound detector (perhaps for security?), although I doubt the microphone is particularly sensitive - its original purpose only requires it to pick up sounds within a 10 or 20 centimetre radius.

Even so, if you put the brush in a key location, the microphone could perhaps detect someone walking past, and you could write some software to push a notification to your phone and inform you.

It's hard to know exactly how (or if) this could be done without more information on the product, which we can't know until it's released, but I'm sure if you were inventive enough, you could overwrite whatever code they have installed (unless the device only contains read-only memory, which is a strong possibility).

  • 1
    @Mawg I'll admit it's not very Rube Goldberg-esque, but hacking a hairbrush to act as a secret security microphone seems pretty extreme to me! I'll see if I can come up with anything else later on, though.
    – Aurora0001
    Jan 7, 2017 at 16:24
  • 1
    Put your tin-foil thinking cap on ;-)
    – Mawg
    Jan 7, 2017 at 16:59
  • 1
    @Aurora0001 Couldn't you just put a wireless mic in the handle of any old hairbrush, though? Jan 9, 2017 at 19:03
  • 1
    @LegendaryDude you could, in theory, but it's less likely that anyone will suspect anything's off if they spot a microphone in a 'smart' brush (but most people would be rightly alarmed if they saw a mic in their normal hairbrush!)
    – Aurora0001
    Jan 9, 2017 at 19:05
  • 1
    Would the mic be for the benefit of those who would hold the brush to their mouth while singing along to MTV?
    – Mawg
    Jan 27, 2017 at 15:04

Use the mic and accelerometer to detect when it's being used to spank someone and have it call the phone with messages about child abuse, spouse abuse, hairbrush abuse, etc.

  • For non Americans, using as a paddle means using to spank
    – Mawg
    Oct 19, 2017 at 8:49
  • 1
    @Mawg For American too. Edited. Oct 19, 2017 at 8:59

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