Make Your Own Digital Analog Wrist Watch

This article is proudly sponsored by JLCPCB.

JLCPCB make high quality prototyping PCBs for people all over the world. They have over 300,000 worldwide customers with over 8000 orders per day! They have over 10 years of manufacturing experience and are super reliable. Try it for your self and get 5 PCBs for just $2 at JLCPCB, Thanks JLCPCB In this instructable, I will show you How to Make Your Own Digital Analog Wrist Watch.

Let's get started!

Thanks to Mr. David Johnson-Davies for Awesome ATtiny85 Based Wrist Watch Project Visit His Website for More Details:

http://www.technoblogy.com/show?1MG3

Attribution 4.0 International (CC BY 4.0)

http://creativecommons.org/licenses/by/4.0/

Components List :

DS2417 RTC Chip (TSOC-6 Package)

ATtiny85V MCU (TSSOP-8 Package)

Tactile Switch (Dimension 5.2x5.2mm, 5mm H)

32.768KHz Crystal (2x6mm Radial Cylinder)

100nF Capacitor (0805 Package)

4.7K Resistor (0805 Package)

4 x 100 Ohm Resistors (0805 Package)

12 x Red LEDs (0805 Package)

CR2032 SMT Battery Holder

CR2032 Battery

To make a PCB you could use the free and easy to use online EDA software EasyEda, I thought about making these PCBs at home but it would be very difficult so i got them made at JLCPCB. You can get 5 PCBs for $2

Link : PCB Layout, Silkscreen, Schematic, Hex, Gerber File

Normally for SMD you would use a hot air station or a re-flow oven. So i hand soldered these. Hand soldering SMD is quite easy if you have the right tools and take your time.

I compiled the program using Spence Konde's excellent new ATTiny Core,
which now supports all the ATtiny processors and supersedes the various earlier ATtiny cores. Select the ATtinyx5 series option under the ATtiny Universal heading on the Boards menu. Then choose Timer 1 Clock: CPU, B.O.D. Disabled, ATtiny85, 8 MHz (internal) from the subsequent menus. Choose Burn Bootloader to set the fuses appropriately.

To show the time you press the button on the watch face, and it lights
up LEDs to show the time like the hour and minute hands on a clock. The LEDs flash to distinguish the hours and minutes, and show intermediate times.

I start making the outer form using plastic sheet for epoxy resin pour. To seal up all edges I used glue. I poured the resin and hardener according to the indicated mixing ratio and mixed very very well. After that, I poured the resin into the form. This epoxy requires 24 Hours to fully cure. To clean all sides I used 80 grit sandpaper. When the job was done here I changed it to 220, 400, 600, 800, 1000, 1200, 1500, 2000, 2500 and finished with 3000 grit sandpaper. To bring back the shine I used thin foam and a regular automotive polishing paste. After good 20 minutes of polishing the shine is back.

This is a fairly easy step. Check the pictures for each step of finishing.