Instructables
Picture of ChronosMEGA; a wrist watch

I've always loved watches; not only are they aesthetic and beautiful, but they are functional, precise and useful. An elegant fusion between engineering and art; two normally opposed perspectives, now joined in harmonic unison. However, all technologies like the dial-up internet, the CVT monitor and the abacus, inevitably will become relics of our past with the advent of advancing technology, and have since become less pragmatic for the typical person to own. Unlike these archaic technologies, the wrist watch still thrives on the wrists of many, standing forever as a testament to one of mankind's greatest inventions: the measurement of time.

I suppose it was inevitable that I would design my very own wrist watch. The name for this wrist watch is the ChronosMEGA, a combination the greek word: chronos for time, and MEGA for the ATmega328P processor used.

The below video is a montage that saturates 4 months of development in 4 minutes.


This short video demonstrates the features of the watch and briefly explains how it functions:


Goals:

  • Robust and practical for daily use; long battery life
  • "Production ready" and professional; to look, feel and behave like a finished product
  • Compact, small form factor
  • Assembly SW to drive the system
  • To be as aesthetic as possible

Specs:

  • Atmel ATmega328P QFP processor
  • Binary time encoding using 10 Blue 1206 LEDs
  • Buttons to control time, sleep mode and display
  • 32.768kHz external crystal and 8MHz internal clock source
  • Micro-USB and Charge Management Controller to recharge 400mAh Li-ion battery
  • Draws 4uA in its Deep Sleep mode to last up to 11 years on a single charge (see section 5.3.)
  • Battery Indicator 0603 LED
  • Boost TI Switching Regulator for power regulation
  • Low Loss PowerPath Controller IC for power source selection
  • Total form factor of 10mm x 40mm x 53mm
  • Custom 3D designed case cast in pure polished silver
  • Genuine crocodile leather watch band
I.1. What will this Instructable provide?

This Instructable will be broken into two big sections:

I.1.1. Section 1: The Design; the Development

This section will introduce my approach and design considerations, and then dive into each component: explaining in great detail how the ChronosMEGA was constructed from top to bottom. There is even a pre-requisites page for a friendly pointer to what topics you must understand so you may understand the topics covered here.

I.1.2. Section 2: The Cloning Process

All files are included in this Instructable so you can build a ChronosMEGA clone with virtually no work on your part. There is a .zip file below on this page with everything you need, including:

• Gerber files to send directly to a board manufacturer
• STL files to send to a 3D printer
• Assembly ASM files to upload directly to the MCU
• Bill of Materials with links to every single part purchased

In this section, I provide step-by-step instructions with plenty of pictures to guide you in cloning. The process will cost you approximately $100 to $700 depending on the options you choose. The largest factor in price is the case material you choose.
 
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Heybye44PTX4 months ago

You inspire me to do great things!

newlum5 months ago

Nick, this is what in this current .zip file and not that REV2 picture you sent me. I just downloaded this .zip file again.

old_design.png
Alephy5 months ago

whaou! good job and good article, please to read that

KROKKENOSTER6 months ago

This will be a real bragger among the young folk "Try and copy me!" And not made in the Orient!!!

dcsabi6 months ago

there should be more like you on instructables,great job and i admire your patience

N.fletch (author)  dcsabi6 months ago

Thanks! I really appreciate that, and I'm glad you liked the project.

nagasaki16 months ago
厉害!
N.fletch (author)  nagasaki16 months ago

謝謝!我很高興的結果。

gfalcone16 months ago

Congrats, great project! I made something similar last year... Take a look at my geekwatch http://m.youtube.com/watch?v=bvs47JIhMbA

N.fletch (author)  gfalcone16 months ago

Nice watch!

paappraiser6 months ago

Insane cool... I would wear it with pride.

Chip Fixes6 months ago

I think this is the most well written and informative Instructable I've seen. You did a really excellent job. Can I ask what program you used to make your schematics?

N.fletch (author)  Chip Fixes6 months ago

Thanks, I appreciate it! I really put effort into making it comprehensive and clear.

I used EAGLE, the freeware version. The paid version for hobbyists is pretty powerful.

alcurb6 months ago

. Nerdfully delightful. Nice documentation.

N.fletch (author)  alcurb6 months ago

Thanks! I pride myself in documenting my projects.

Pantagruel6 months ago
Wow, that's something else.

Awesome work... I had a slightly similar project in mind of a binary wrist watch. If I ever come around to building it, your Instructable will be a huge help. Thanks for sharing@

sfa veg6 months ago

Hi, It was perfect, I love your idea and how you come up with this idea, it was first time for me that i watched how in abroad electricians make boards with live design and ... I just love to put this kinds of LED on back off e shirt (coat or etc...) riding my motorcycle and just a round circle of LED start circling :D or when I wanna turn a circle stop for a second and show to where I wanna turn ! I saw kind of things they made for riding bike but, I haven't liked them so much,

thanks for your time

s.d.f

Regax6 months ago

Very cool project! I love how you were able to completely break everything down into text and pictures and it was all great information with no filler. Very, very well engineered and this just got favorite'd!

N.fletch (author)  Regax6 months ago

Hey thanks! That means a lot. I always prefer building things from the ground up. Still no match for your beer pong table though ha.

Vary nice instructable I am interested in making two of them with a pal of mine.

toasteroven476 months ago

"I've always loved watches; not only are they atheistic" i wasn't aware watches had any religious affiliations. haha cool project though!

N.fletch (author)  toasteroven476 months ago

Good catch, I would have never caught that.

samalert6 months ago

damn longest ible i have read !

N.fletch (author)  samalert6 months ago

Longest I've seen is Regax's awesome LED Beer Pong table:

http://www.instructables.com/id/Interactive-LED-Be...

samalert N.fletch6 months ago

rofl