Blueprint

NanoWatch

An microcontroller powered watch with wifi, bluetooth, calculators and other communication methods while conserving power

Created by void void

Tier 3

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samliu samliu ⚡🚀 requested changes for NanoWatch ago

This isn't a valid wiring diagram! I should be able to look at it and build it myself. The point of shipping a project is so others can build, experience, and improve what you've made. I can't see how this thing will fit together, you should CAD a case to show how everything is going to fit. I'm not convinced by the current design.

Also, for CAD, please make sure to include the source files, and if you used Blender for your renders, include the .blend file as well.

Please make sure you fully check over the submission guidelines (https://blueprint.hackclub.com/about/submission-guidelines). Go through the list yourself and check it off one by one.

void void submitted NanoWatch for review ago

void void added to the journal ago

Developed the CAD model and rendered a showcase clip

  • I imported the models (the few I could get) from grabcad,
  • designed the wrist watch, the plexiglass,
  • arranged how it should all come togeather,
  • the models didnt have different materials so I manually selected faces and assigned new materials
  • spent an unreasonable time getting the materials right, importing some, manually creating most of em,
  • and spent even more time trying to get it rendered properly (this was excluded in time spent),
  • and finally did some editing on the image sequence to compile to a video

Check out the video!

image

Kai the Jolly Guy Kai the Jolly Guy 🚀 requested changes for NanoWatch ago

Nice job void, thanks for creating a CAD model! Could you please journal in-depth about how you created it, including screenshots of the different sketches you made, and detailing the whole process!

void void submitted NanoWatch for review ago

Kai the Jolly Guy Kai the Jolly Guy 🚀 requested changes for NanoWatch ago

I love the concept for your project, but it's lacking a fundamental CAD model or PCB from what I can see! You need to have your project fully modeled out, or a full PCB that'll function as your project in order to qualify for a grant, and all I see is inspiration photo's right now, so you need to just have something tangible! Once you've created a 3D model or have added a finished PCB, please add photo's in your readme so that we can see your project!

void void submitted NanoWatch for review ago

William William 🚀 requested changes for NanoWatch ago

You're lacking any source KiCad files
please upload those.

you should also clarify what the image of the watch is on GitHub if its a photo you're using as inspiration, because at first it mislead me to believe that was what you had already made.

i love the vision for the project thought!

void void submitted NanoWatch for review ago

Sidd Sidd 🚀 requested changes for NanoWatch ago

Cool project! However like the previous reviewer said you can find some of these parts pretty readily on aliexpress.
(e.g. Arduino Nano https://www.aliexpress.us/item/3256805941736729.html)

void void submitted NanoWatch for review ago

void void added to the journal ago

revised the BOM

LinkedIn cover - 5

Revised the BOM with much more cost effective options, sourcing parts from the cheapest sources (yes amazon did have the cheapest version of quality as well for a few products)

Iamalive Iamalive 🚀 requested changes for NanoWatch ago

It looks like you're buying stuff from Amazon! Try to look at other retailers like Aliexpress and Temu, as they have much cheaper prices

void void submitted NanoWatch for review ago

void void added to the journal ago

Made the diagrams and circuits

nanowatch
So pertaining to the last log, I sketched the circuit diagram, made a workflow of project, and programmed a draft for the system.
This log shall be short, for the files are self-explanatory over github.
circuit
flow

zsharpminor zsharpminor requested changes for NanoWatch ago

Hi, please add images to your README, as well as including your source CAD, PCB, and Firmware files (as needed) in your repo. Thanks! Also, please try to get your parts from AliExpress for cheaper, thanks.

void void submitted NanoWatch for review ago

void void added to the journal ago

Researched on the project

I spent a few hours researching on how I'm going to implement the project, what tools and tech to use, sketched out a working design.

So the crux of the project is to make a wrist watch that has these features:

  • Shows current time and date
  • Has simple applications like a calculator
  • Supports wireless pairing with bluetooth
  • Is very low-powered, maximizing charge runtime
  • Is magnetically strap-able and thus modular

And therefore, after analyzing through lots and lots of options and products, I've settled on the following components:
Arduino Nano 33 BLE Rev 2 (Best due to its size, power, and BLE support)
TM1637 4 Bit Display (Enough for clock + basic features while consuming low power)
Switch Array (For controlling input and processing data)
Small Nd magnets (For magnetic modularity)
Artificial Leather (For strapping and covering the watch)
Plexiglass (For mounting and containing the circuits)
Lithium Polymer Batteries (For power and space efficiency)
TP4096 Charger module (For charging, ofc)
AMS1117 Voltage Regulator (For providing stable voltage to Nano)

image
(Just a random image for reference, of course, my watch will look much different)

void void started NanoWatch ago

12/14/2025 - Researched on the project

I spent a few hours researching on how I'm going to implement the project, what tools and tech to use, sketched out a working design.

So the crux of the project is to make a wrist watch that has these features:

  • Shows current time and date
  • Has simple applications like a calculator
  • Supports wireless pairing with bluetooth
  • Is very low-powered, maximizing charge runtime
  • Is magnetically strap-able and thus modular

And therefore, after analyzing through lots and lots of options and products, I've settled on the following components:
Arduino Nano 33 BLE Rev 2 (Best due to its size, power, and BLE support)
TM1637 4 Bit Display (Enough for clock + basic features while consuming low power)
Switch Array (For controlling input and processing data)
Small Nd magnets (For magnetic modularity)
Artificial Leather (For strapping and covering the watch)
Plexiglass (For mounting and containing the circuits)
Lithium Polymer Batteries (For power and space efficiency)
TP4096 Charger module (For charging, ofc)
AMS1117 Voltage Regulator (For providing stable voltage to Nano)

image
(Just a random image for reference, of course, my watch will look much different)

12/21/2025 - Made the diagrams and circuits

nanowatch
So pertaining to the last log, I sketched the circuit diagram, made a workflow of project, and programmed a draft for the system.
This log shall be short, for the files are self-explanatory over github.
circuit
flow

12/25/2025 - revised the BOM

LinkedIn cover - 5

Revised the BOM with much more cost effective options, sourcing parts from the cheapest sources (yes amazon did have the cheapest version of quality as well for a few products)

2/3/2026 - Developed the CAD model and rendered a showcase clip

  • I imported the models (the few I could get) from grabcad,
  • designed the wrist watch, the plexiglass,
  • arranged how it should all come togeather,
  • the models didnt have different materials so I manually selected faces and assigned new materials
  • spent an unreasonable time getting the materials right, importing some, manually creating most of em,
  • and spent even more time trying to get it rendered properly (this was excluded in time spent),
  • and finally did some editing on the image sequence to compile to a video

Check out the video!

image