Picture of Arduino Watch with Nokia 3110 screen
My goal for this project is to make a watch with selectable dials, stopwatch and millidays.

This idea started with an Aprils fools prank about metric-time. (
First I wanted to make a metric clock but soon this idea evolved from a metric watch into an open course watch.

I knew that it would be hard (or impossible) to make the watch small enough to really wear, but I wanted to try it anyway.
This would be mostly a programming project, but that is nice for long, cold and dark winter nights. 

So my watch needs to be:
  • small enough to wear
  • easy to reprogram
  • capable of showing metric time
  • have selectable dails
  • have an easy understandable menu structure
  • controllable with just 2 buttons (digital watches with 4 buttons confuse me)
  • cheap (I'm still Dutch you know)

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Step 1: You will need

Picture of You will need
For the Watch
  • Arduino Nano
  • Nokia 3110 screen (Adafruit or something)
  • 2 pushbuttons
  • 2 10K resistors
  • some wires
  • (optional a thermometer-ic)
  • 2 button-cell batteries
  • 2 small magnets
  • a small breadboard for prototyping if you want

Tools and stuff
  • soldering iron
  • solder
  • desoldering pump (or wick)
  • pliers
  • usb-cable
  • computer with Arduino software

  • silicon kit (black)
  • buckle (from old watch)
  • plank
  • aluminum 15 mm x 15 mm L-profile
  • aluminum strips and scraps
  • screws
  • polyester filler
  • polyester topcoat
  • wax
  • superglue

tools and stuff
  • screwdriver
  • hacksaw
  • old credit card 
  • spatula
  • dremel
  • grinding stones for the dremel
  • sanding paper
  • some clean cloth
  • rubber gloves
  • ruler
  • sharpy
jflopez11 days ago

GREAT WORK!!! I'm trying to make one like this =D

ecozcelik2 months ago

Please help.

In file included from sketch_oct12b.ino:1:0:

C:\Users\Server\Documents\Arduino\libraries\Adafruit-PCD8544-Nokia-5110-LCD-library-master/Adafruit_PCD8544.h:28:17: fatal error: SPI.h: No such file or directory

#include <SPI.h>


compilation terminated.

kenyer (author)  ecozcelik2 months ago

It looks like you are missing the Adafruit library. Look in step 3 where to get it. On the Adafruit site or de site, you can find how to install the libraries (if that's the problem)

Raphango4 months ago

Whoa! Great! I am eager to see your next version!

shizumadrive10 months ago

Someone who has a laser cutter could probably make a real nice case for the watch like the pi-bow acrylic cases.

or maybe a Venture Brothers watch case

kenyer (author)  shizumadrive10 months ago
I've just got myself a 3d-printer so I might come up with something nice :) Thanx for the ideas.
Cool. Cant wait to see the next version.
Eagle199393 made it!10 months ago

kenyer (author)  Eagle19939310 months ago

Wow COOL! You've got the temp. sensor working correctly! Really cool

Eagle199393 kenyer10 months ago

I made some changes with your cod.

kenyer (author)  Eagle19939310 months ago

can you post the changes you've made?

Eagle199393 kenyer10 months ago

There are some unnecessary lines of code. but how you can see it works. I use LM35 sensor, connect it to pin A0 on Arduino.

BadPuns11 months ago
This is awesome. I didn't know someone had already come up with a concept of metric time. I was tossing that idea around years ago. You could make this into a pocketwatch and then you wouldn't have to worry about making is as small, or worry about the wrist band.
kenyer (author)  BadPuns11 months ago
That is really a good idea! Thanx
rmd65021 year ago
This is epic! I have a similar project at - feel free to use anything from there if you find it useful. I think with a custom PCB and some really steady hands you can get this much smaller :-)
kenyer (author)  rmd65021 year ago
You made me really curious, but your link doesn't work. (steady hands might be the problem :) )
rmd6502 kenyer1 year ago dash instead of underscore :-)
kenyer (author)  rmd65021 year ago
nice, thats a real smart-watch concept. Did you bring it further than the picture?
have you thought of making kits of this?
kenyer (author)  The nerdling1 year ago
No I didn't. All parts are easily obtainable so I don't think there would be much demand. For me this project was more a proof of concept.
MartijnD1 year ago
Nice project! Some ideas for your next watch: Use li-po batteries like ipod shuffle, good imitations replacement are cheap, add wireless charging and communication or via gold contacts, see garmin etrex gps units for example, embed fabric before casting like carbon fibre, cast in "natural" shape(not flat)
kenyer (author)  MartijnD1 year ago
great ideas for 2.0. The casting in shape will be hard though, because of gravity and the manufacturing of the mold.
hchan101 year ago
Which Thermometer IC do you use ?
kondzio291 year ago
And one more question: is it possible to make your project using nokia 3310 display extracted from an old phone ?
kenyer (author)  kondzio291 year ago
Hi Kondzio,
I haven't tried it yet, but I think it should work with just a screen taken from an old Nokia. This is also just a screen soldered on a PCB.
kondzio291 year ago
isn't it nokia 3310 display?
you should make an arduino clone using the bare minimum of parts needed for atmel chip to work. think about it! when you finish the project and everything will be ok, you don't have to reprogram the arduino every time. i think you should make your own arduino clone using the dimensions of nokia display board. using that amount of wires can be a real problem. and another idea is to use 3.3V for arduino instead of 5V. you will only need 2 batteries and a small low drop-out regulator to power everything. also, you can try something like automatic light up the screen when you turn the wrist to watch what's the clock. this small improvement it's used by casio watches. cheers!
kenyer (author)  Timofte Andrei1 year ago
Cool ideas! I already made an Arduino-clone, but I won't be able to make it smaller than this one. I am waiting for my 3d-printer now to make a new housing for it. I like the idea of integrating a light-sensitive resistor and a tilt-sensor.
I should have used a 3.3V Arduino, but I didn't have one and this also works :)
Thank you for your ideas!
hertzgamma1 year ago
Great work!
arnefl1 year ago
Cool project. You could use voltage dividers like here
kenyer (author)  arnefl1 year ago
I know. They also exist in an IC format. The problem was that I din't have the parts (or the patience to wait for is) and I didn't have the room to put it.
The drawing is a really good explanation of the voltage divider.
Cello621 year ago
Great project!