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Crowdfunded 'PowerWatch' Runs on Body Heat, Never Needs Charging (engadget.com)

Posted by EditorDavid on from the having-a-hot-time dept.

Engadget reports on a new watch that suggests the possibility of a future without chargers: This thermal-powered wearable doesn't need one -- it gets energy by converting your body heat into electricity. It's been a year since I saw an early prototype of the PowerWatch -- a smart(ish) watch that tracks basic fitness metrics. Now, the self-proclaimed energy-harvesting company is finally ready to ship PowerWatches to the early adopters who backed its Indiegogo campaign...

Because its functions are pretty basic and its LCD screen is relatively low-powered, it doesn't take too much electricity to keep the watch running... The PowerWatch can not only tell the time, set alarms and timers but also track your activity and sleep... Matrix co-founder Douglas Tham said the PowerWatch will keep running for up to 12 months if you don't wear it, and a PowerSave mode kicks in to conserve energy by killing non-timekeeping functions.

49 of 81 comments (clear)

  1. And by Anonymous Coward · · Score: 4, Informative

    It's also been a year since the debunking video existed

    1. Re:And by crashumbc · · Score: 1

      yeah, I can't imagine the physics behind this work... and you'd have to wear it tight as shit..

    2. Re:And by Hal_Porter · · Score: 2

      All these 'energy harvesting devices' cheat. They find a microuniverse and suck the energy out of it. Eventually the microuniverse being energy sucked implodes with the death of all its inhabitants and they just move on to a new one. The bastards.

      They're also the reason you need to wear a hat, coat and scarf inside your Tardis despite setting the climate control to 'temperate'.

      --
      echo -e 'global _start\n _start:\n mov eax, 2\n int 80h\n jmp _start' > a.asm; nasm a.asm -f elf; ld a.o -o a;
    3. Re:And by Hognoxious · · Score: 2

      Doesn't the efficiency of conversion depend on the temperature difference between the source and the sink? Which, compared to a classical steam engine, is going to be not much Fahrenheit (in metric: bugger all Celsius).

      Thermodynamically speaking, heat to something else is uphill; it's possible but a lot harder than the other way round.

      --
      Confucius say, "Find worm in apple - bad. Find half a worm - worse."
    4. Re:And by ShanghaiBill · · Score: 2

      yeah, I can't imagine the physics behind this work... and you'd have to wear it tight as shit..

      Even then, it won't work for people with Raynaud's Syndrome. My spouse has Raynaud's, and in the winter her hands (and feet) are so cold that there would be a negligible thermal gradient.

    5. Re:And by nospam007 · · Score: 2

      "All these 'energy harvesting devices' cheat."

      I got a watch 50 years ago that harvested its power, not from the heat, but from the movement of my arm.
      And it still works and doesn't need any upgrades or patches.

    6. Re: And by Anonymous Coward · · Score: 1

      https://en.m.wikipedia.org/wiki/Automatic_watch

      By the 1960s, automatic winding had become standard in quality mechanical watches.

    7. Re:And by Anonymous Coward · · Score: 1

      I don't need youtube. I radiate approximately 100W. You have about 20 ft^2 of skin, figure about 1.5 in^2 for the watch, that means you can get (with 100% conversion) 0.5 milliwatts. Forgive the non-metric units -- I am an American. It's going to be tough to charge a battery with that and power the watch.

      Personally, i think you could do better with self-winding. I could do the potential energy generation for a rotating weight but I will leave that someone else.

    8. Re:And by DivineKnight · · Score: 1

      I got mine, a Casio, for ~$30, several months ago, and it has both a battery and a this thing called a 'solar cell.' Turns out, most people need light to read a watch face, and will be outside at some point during the three months or so that it might take to discharge the battery...it can also charge just fine indoors, using ambient light. Like a solar calculator, doesn't need much to run...

  2. Re:More Information by Fly+Swatter · · Score: 4, Funny

    That's some nice copy and paste skills. Anonymous coward, you will fit right in with half the computer programmers out there.

  3. So, by no-body · · Score: 2

    what are cool guys/gals doing then with such a device?

  4. Huh? by K.+S.+Kyosuke · · Score: 1

    I find it dubious that low-value heat would be more suitable for powering a watch than, say, a flexible solar cell in the watch strap.

    --
    Ezekiel 23:20
    1. Re:Huh? by msk · · Score: 2

      My solar-powered, WWV-listening Casio analog/digital watch has been running for eight years and these days remains on an always-shaded windowsill for a week or two at a time.

      While a body heat-powered watch is nifty, mine is niftier.

    2. Re:Huh? by Wycliffe · · Score: 1

      I find it dubious that low-value heat would be more suitable for powering a watch than, say, a flexible solar cell in the watch strap.

      Exactly. I would guess that an "invisible" solar panel behind the watch face or even a small disc a few millimeters wide could generate more energy from ambient light in an office than you could ever generate from waste body heat.

    3. Re:Huh? by Hal_Porter · · Score: 1

      Those things seem to last forever. Presumably eventually the Lithium Ion battery will need to be replaced due to this effect

      https://en.wikipedia.org/wiki/...

      Loss rates vary by temperature: 6% loss at 0 C (32 F), 20% at 25 C (77 F), and 35% at 40 C (104 F).

      Still mine's still going strong after 7 years.

      --
      echo -e 'global _start\n _start:\n mov eax, 2\n int 80h\n jmp _start' > a.asm; nasm a.asm -f elf; ld a.o -o a;
    4. Re:Huh? by ctilsie242 · · Score: 1

      I would assert that some type of flywheel that uses the motion of one's arm, similar to self-winding watches, would bring in more energy over time, and one can use a self-winding watch case to keep the watch at full charge when it is not in use.

      For body heat to work, the watch needs a hot side, and a cold side... and a reverse Peltier junction. However, the surface area of the watch just doesn't seem up to the task, especially if the watch is worn in a jacket.

      I would rather go with a solar panel (perhaps the transparant type that GE is hawking) under the watch crystal as well as the flywheel.

    5. Re:Huh? by K.+S.+Kyosuke · · Score: 1

      The flywheel is mechanical, though, and probably breaks more easily than a (solid-state) solar cell. A solar cell really seems ideal for this, not to mention its very high possible output compared to any other energy scavenging scheme.

      --
      Ezekiel 23:20
    6. Re:Huh? by ctilsie242 · · Score: 2

      I would agree that because it is a moving part, it eventually may have issues. However, there are many self-winding watches out there that have long lifespans. Seiko, Bulova, and other brands have been making self-winding watches for many years, and their failure mode rarely is the mechanics involved.

    7. Re:Huh? by pecosdave · · Score: 1

      12!

      Got it for about $75 at Walmart.

      --
      The preceding post was not a Slashvertisement.
    8. Re: Huh? by Kazymyr · · Score: 1

      And my Seiko Kinetic has been running continuously for almost 10 years not needing any www connection to keep good time, nor battery changes, winding etc. All it needs is that I wear it at least 10 days every month.

      --
      I hadn't known there were so many idiots in the world until I started using the Internet -Stanislaw Lem
    9. Re: Huh? by TeknoHog · · Score: 2

      And my Seiko Kinetic has been running continuously for almost 10 years not needing any www connection to keep good time, nor battery changes, winding etc. All it needs is that I wear it at least 10 days every month.

      Or one special Saturday night every now and then.

      --
      Escher was the first MC and Giger invented the HR department.
    10. Re: Huh? by default+luser · · Score: 1

      But it's doing a whole lot less than your thing is.

      This thing has an LCD display and active senors that seem to be constantly running. Both of which are far bigger energy sinks than moving a mechanical watch hand once a second.

      --

      Man is the animal that laughs.
      And occasionally whores for Karma.

    11. Re:Huh? by hey! · · Score: 5, Informative

      Watch geek here.

      A watch doesn't take much power at all. Digital watches can run for years on tiny, tiny batteries. The classic Casio F-91w, also known at the "al Qaeda watch" runs for seven years on a CR2016 cell which delivers 100 maH at 3V: in other words roughly 1000 joules. That translates to a power draw of 5 microwatts.

      Now a smart watch is going to draw a lot more power than that, because it has a processor and probably a part time on luminous display to power. But "a lot more than 5 microwatts" leaves a lot of headroom.

      Now there are mechanical watches that are powered by photovoltaics, but combining this with a display could be tricky. But another possibility might be a small dynamo powered by wrist action. Of course non-electronic "automatic" watches have been doing this for decades, but every since Seiko introduced it's "kinetic" watch movements in the mid 80s there have been quartz watches powered by mechanical generators with capacitive storage. Currently Seiko and Swiss manufacturer ETA produce "mechanical quartz" movements.

      The question is whether you get more power out of a mechanical generator or a thermoelectric generator. I believe Bulova introduced a thermoelectric quartz watch in the 80s, but it never caught on, where as kinetically powered and photovoltaic powered quartz watches remain quite popular. Undoubtedly the technology has improved since then.

      --
      Post may contain irony: discontinue use if experiencing mood swings, nausea or elevated blood pressure.
    12. Re:Huh? by K.+S.+Kyosuke · · Score: 1

      Even if you're going for low power "non-smart" watch, chances are that a solar cell would be much cheaper to build and integrate. They're a "less-specialty" item than a thermoelectric generator nowadays. And the comparison is better for a solar cell even when comparing it with a TEG for a high temperature differential. I don't even need to see the price/power difference for body heat levels.

      --
      Ezekiel 23:20
    13. Re:Huh? by K.+S.+Kyosuke · · Score: 1

      I don't question that it's possible, but at what cost (and price to the customer)? The solid-state solution will be cheaper than a solution that is both mechanical and reliable. It will also offer more power to the device.

      --
      Ezekiel 23:20
  5. Re: More Information by Fly+Swatter · · Score: 2

    Haha, its a copy paste of the summary right there at the top, he just changed a few words, it added nothing. In fact he left out the hyperlinks so it's even less than the summary gave. But yes it was an attack at duplicate information presented as new.

  6. Not what was promised by guruevi · · Score: 4, Insightful

    When this first came out, the makers promised a fully fledged smart watch. Now this thing could easily be powered for 5-10 years with a button cell and many âoeregularâ models like it have existed for at least a decade.

    Watch the thing dying on everyone after 13 months, right outside the warranty.

    --
    Custom electronics and digital signage for your business: www.evcircuits.com
    1. Re:Not what was promised by AmiMoJo · · Score: 3, Informative

      There are many bullshit claims on their page. "Accurate calorie count" via thermal management... No, skin temperature is not correlated with calorie burn to any useful extent.

      They are extremely vague about how they will monitor your sleep quality too. It's not really a smart watch either, it doesn't have any connectivity.

      My guess would be that it's a basic LCD watch with step counter built in. The calorie burn and sleep monitor are faked from the step counter data.

      --
      const int one = 65536; (Silvermoon, Texture.cs)
      SJW, n: "Someone I don't like, and by the way I'm a fuckwit" - AC
    2. Re:Not what was promised by Nethead · · Score: 1

      And who the hell wears a watch to bed? I don't even like one when I'm typing. Besides, I have a phone that tells time. I haven't had a need for a watch in over a decade.

      --
      -- I have a private email server in my basement.
  7. "Have you heard about the watch by TheOuterLinux · · Score: 2

    that you wind only every few days or so (some five on a single wind)? No batteries. Tells time. Crazy." **Rolls eyes and looks at his grandfather's "antique" watch.**

    1. Re: "Have you heard about the watch by TheOuterLinux · · Score: 2

      âoeFar out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small unregarded yellow sun. Orbiting this at a distance of roughly ninety-two million miles is an utterly insignificant little blue green planet whose ape-descended life forms are so amazingly primitive that they still think [fitness tracking] watches are a pretty neat idea.â -- Douglas Adams, Hitchhikers Guide quote in context. George Orwell would think it's funny. "Arms bending and stretching!' she rapped out. 'Take your time by me. One, two, three, four! One, two, three, four! Come on, comrades, put a bit of life into it! One, two, three, four! One, two, three, four! ..." -- George Orwell, 1984.

    2. Re:"Have you heard about the watch by Cyberpunk+Reality · · Score: 1

      My grandfather gave me this crazy high tech invention:

      https://en.wikipedia.org/wiki/...

      --
      Rule 35 of the internet: "If it can be hacked, it will be". - Charles Stross
    3. Re:"Have you heard about the watch by thegarbz · · Score: 1

      No batteries. Tells time. Crazy.

      So what you're saying is it is completely and utterly worthless. Time is free. You right now are in the vicinity of at least two devices that can tell you the time.

      A watch must do more or show off. They are either a fashion accessory or a functional gadget. Being able to tell time is it's least desirable feature, which is kind of why the more money you spend on a watch the less likely it is to keep as accurate time as a $10 Casio.

    4. Re:"Have you heard about the watch by TheOuterLinux · · Score: 1

      Whaaaaaaaaaaat?!

  8. I've had my Casio 12 years, original battery. by pecosdave · · Score: 1

    It's solar, it get NIST time, sure body heat charging would be fine, but as far as I'm concerned solar is proven.

    --
    The preceding post was not a Slashvertisement.
    1. Re:I've had my Casio 12 years, original battery. by TeknoHog · · Score: 1

      as far as I'm concerned solar is proven.

      [citation needed]

      I live in my mother's basement, you insensitive clod!

      --
      Escher was the first MC and Giger invented the HR department.
  9. Value Differential by fibonacci8 · · Score: 1

    The biggest trouble with this seems to be the difference between what it's priced at and what it's worth. A $199 price tag on something worth, maybe $70 over the expected usage of the product (guessing at time saved estimating calories spent doing other things of potential value after 30ish years of use), is a tough sell.

    --
    Inheritance is the sincerest form of nepotism.
  10. What if? by AndyKron · · Score: 1

    What if you're dead? Does it still work?

  11. Re: More Information by dougdonovan · · Score: 1

    ok. so. where is the c thru laptop ?

  12. What's wrong with a kinetic watch? by RightwingNutjob · · Score: 1

    Not appy enough?

  13. I just use my phone by rsilvergun · · Score: 1

    The only reason to buy a watch in 2017 is as a fashion accessory or if you're hiking/camping. And if you're doing that then why aren't you buying a wind up or if you're really well to do one of those expensive ones that 'wind' while you move?

    --
    Hi! I make Firefox Plug-ins. Check 'em out @ https://addons.mozilla.org/en-US/firefox/addon/youtube-mp3-podcaster/
  14. Too dangerous by bagofbeans · · Score: 1, Funny

    It got updated from c thru to c sharp, and the beta testers kept cutting themselves.

  15. Not new. There has been thermal powered watches si by www.sorehands.com · · Score: 2

    https://www.watchonista.com/ar...

    This talks about two watches that are powered by body heat, in the 1980s. I remember one in the ate 1980s for a digital watch powered by body heat.

    --
    Fight Spammers!
  16. It's got to work by minstrelmike · · Score: 1

    Seems to me if humans as batteries worked in The Matrix, that means it would have to work in real life. Or do I have that backwards?

    1. Re:It's got to work by Hal_Porter · · Score: 1

      The Matrix would make more sense if the captive humans were being used as computation devices. Brains manage full consciousness in only a few Watts. Apparently the original script did say that but they thought it would be too hard for the audience to understand.

      --
      echo -e 'global _start\n _start:\n mov eax, 2\n int 80h\n jmp _start' > a.asm; nasm a.asm -f elf; ld a.o -o a;
  17. Self-winding watches by 14erCleaner · · Score: 2

    My dad had a "self-winding" watch (analog, obviously) that drew its energy from your motion. This was probably around 1970. I guess this new watch is the same thing, only for people who don't move around much.

    --
    Have you read my blog lately?
  18. I'm going to look at the positive side of this by Neuronwelder · · Score: 2

    IF this article is true. It's finally using science to do something positive for us. They could progress this heat energy to cell phones and more. It's very depressing and sickening to see science to track us, know what we are doing, hide extra charge on bills, and software to "look over our shoulders" to "ensure" we sweat hard every second at work, One example: You would not believe how sophisticated, they track truckers! Have respect for them and stay out of their way of their way! Today's truckers almost literally drive with a gun behind their heads. I have many other examples of negative software but I don't want to drone on.

  19. Uses a human being as a power source -- uh-oh... by jeffkoch · · Score: 1

    ... we're in The Matrix.

  20. Re:List of truths the left doesn't want you to kno by KingBenny · · Score: 1

    most interesting and very relevant however, might i suggest a decimation ... actually id prefer that only 10% of the total population be left ... purely random, no selection on whats needed, just let Darwin do the rest later ... because other than farting and breathing-out tax in the long run it will be worse than cows and cars ... wether you're a cr'h'acker-on-meth or a nugger-wiv-tits ... you probably fart about the same amount and the amount of blabber coming out on both sides is a serious crime against the co police so
    twelve monkeys for the win, indiscriminate ... give me the button and i'll push it myself
    i still don't see the relation to the smartwatch, however i DO see how wrecking the charger industry (AND YAAAY finally a standard : the only good charger is no charger, total charger-anarchy) grants big datacorp super-access b/c you can simply not take it off, its a voluntary chip up yo (momma's)(w) ass thats what it is

    --
    Free speech was meant to be free for all... how can anyone grow up in a nanny state ?