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oh god this is it a smart watch but it just ah

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oh yeah look there it is it's still keeping time wearables some of them are okay but a

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lot of them are less okay between their unintuitive interfaces patchy app

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compatibility subpar battery life and nasty habit of phoning home with all of

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your most intimate details it is no wonder that someone finally said it

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forget this i'm gonna build my own smart watch

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Linus

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i'm gonna be up front we didn't do this whole thing on our own in fact all we

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really did was print ourselves a neat watch case and wrist strap

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but what's cool about this project is that we could make this watch if we

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wanted to both the hardware and the software are completely open source and

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the name of the project you ask i'm glad you did it's open source smartwatch

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it's a good name paul smith the lead is a full stack

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cloud developer by day maker by night and you might think that someone who

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works in cloud computing would have wanted every aspect of their project to

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synchronize with cloud servers but it's

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actually quite the opposite while wearables might not be on your radar the

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biggest tech giants in the world have latched onto them and for good reason

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besides being an ever-present link to your smartphone they are the perfect

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opportunity to load somebody up with sensors and while those sensors can do

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extremely valuable things like measure your heart rate or your movement

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the unseen bonus for these tech companies is the absolute treasure trove

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of data that can be harvested from them that is what made paul so uncomfortable

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starting back in 2018 then he began with an e-ink display an older esp module and

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a handful of surface mount components the first test mule might not have been

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the prettiest thing in the world but it was clearly a strong start because look

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where we are just a few short years

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later like look at this thing it's a little on the

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bulky side but damn it's wearable you know

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like because it's a wearable get it but i just mean it's not luggable like

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it's it's wearable it's a little rough around the edges

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literally like ow but there it is

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the goal was to make a watch that supported modern conveniences gps maps

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and tracking but stored the data locally on a micro sd card and paul has actually

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got all of that going but the version that i'm wearing is the light edition

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that means no gps or sd expansion but it

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also means a smaller pcb and therefore body size

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as far as the software goes there are a few watch faces and some hardware demos

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but that's about it now the light edition here started out

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as a side quest but has become a pretty popular one just a few days ago pcb

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manufacturer lilligo made a trial run of these watch assemblies that sold out

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within minutes and that bodes really well for getting this hardware into the

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hands of a community of people that will build upon paul's work and develop new

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software for it but then let's say they do that what would you

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get every part of our watch is 3d printed even the flexible strap which

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before we did this video i didn't even know that you could print such like

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rugged flexible things that's super neat at first glance here we've got a 200 by

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200 pixel round ips display of course

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it's not quite 4000 pixels because it's round but it looks pretty good from all

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angles and has more than ample brightness below that we've got four

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buttons and a micro usb port for data transfer and charging

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the top left button is reset then the other three are utility buttons that

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vary depending on what app you're using and i gotta say

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i am so glad to see hardware buttons like i use my pebble time for music

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control when i'm on my motorcycle and it's like tactile buttons hello

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sometimes i wear gloves on this one then if we long press the

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lower left button like so we get a little white square that pops up and

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then on release we change pages so far there are only six pages the watch face

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a stop watch a connection test to link to the wi-fi you configured a ball and

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cross-hair test for the accelerometer this could kind of pass for a game right

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how long can you hold your ARM level

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and finally some system info paul was

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also nice enough to do a custom page for us that actually plays our intro which

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is super neat it has some issues you can actually see

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there's a bit of artifacting in the beginning of the animation but

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considering he slapped this together in 20 minutes i think i'll give him a pass

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now because it's not all sealed up with an insane amount of adhesive all we have

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to do to take it apart is remove i mean we gotta get the strap working

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and then all we have to do is take off these four screws to show you what's

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inside ifixit score 10 out of 10.

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just like the shirts at lttstore.com will make you a 10 out of 10. if you

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know what i mean

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okay so we just gotta give it a little pop

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there's the screen gotta be careful all right there we go so under the

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screen you find the brains of the operation or well okay actually it's on

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the underside of this oh good lord

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okay i've completely broomed it colin all the buttons fell out there it is

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that right there is the open smartwatch pcb in all of its glory it's just 36

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millimeters in diameter so that's 1.4 inches for you liberians and its heart

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is this tiny little chip right here the ttgo32 micro it's a system and package

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module based on the esp32 made by expressif the esp line of chips has

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absolutely surged in popularity lately due to their low cost large feature set

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and diminutive size this one in particular is actually even smaller than

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most of them about half the area of a normal esp32 measuring at just 13.3 by

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19.2 millimeters and this tiny powerhouse is an absolute bargain at

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around seven dollars not only is it a very capable processor

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you can even run python on it it has built-in wi-fi and bluetooth and a huge

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variety of open source tools and libraries to build upon so it's a

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logical choice for someone who's bootstrapping a small device like this

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one we've actually been using a relative of this guy in some of our own projects

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here at LMG now we're not going to go too deep into the pcb design here

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because frankly we're not qualified however the

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fine folks over at hackster.io have written an excellent breakdown of this

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entire board so if you want to dive into the components we're going to have that

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linked in the comments for you to keep it simple though this light version of

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the open smartwatch packs a barometer tri-axial accelerometer a real-time

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clock and all of the power conversion and charging ics that are needed to keep

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this thing running and run it will in fact by pulse calculations the 450

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milliamp hour single cell lipo down here should give you up to 50 days of sleep

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time due to all the power conserving features that are built into the board

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and the software although of course feature creep like you know say for

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example watch faces that are more than just a thing moving like this are

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probably going to reduce that and guys

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that's it that's the whole thing

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at least for the electronic side of it for proof of concept we pulled down some

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of the cad files for the project and gave them a go ourselves in our prusa

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sl1 resin printer and made this case which is a variant that supports 20

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millimeter spring pin watch bands and oop well okay we got the tolerances

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off just a little bit on that one but hey generally speaking it feels a lot more

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finished because like men those resin printers

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like basically feels so good by the way if you guys are

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into 3d printing get subscribed because we have some really cool stuff in the

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works we are making a case and we're actually checking out a chocolate

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printer now of course

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for the average consumer today the open smartwatch isn't very

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smart really at all it doesn't even have on-risk

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notifications so um

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pretty much all it does is tell the time which means you might be wondering why

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we bothered to feature it on Linus tech tips

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the reason is that we really like paul's moxie

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paul thinks that you should at least have the choice to keep your data to

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yourself and we want to see this project become a success

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yeah there's no app store but there's also no micro transactions no monthly

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access plans and no cloud phoning home

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just a cool tech project that we are rooting for along with other similar

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ones like the pine time which is made by the same folks that brought us the pine

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phone that you saw in ShortCircuit and the watchi both of those are also open

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source these sorts of projects hardly ever get

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the same sort of traction that big consumer bucks can bring to a device but

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it's really important to us that they continue to exist so guys if you've got

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the time and you've got the skills reach out to the developers in the link below

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if you want to help them move forward and while you're down looking at the

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links below maybe move forward with building your own website with our

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we hope you guys enjoyed us taking a look at this neat little watch project

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and if you like sort of out there wearables why not take a look at our

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video covering the nubia alpha a device that i absolutely loved even though

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objectively speaking it was just atrocious

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it's really bad