F*WATCH, making a watch differently! Federico Vaga, Matthieu Cattin - - PowerPoint PPT Presentation

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F*WATCH, making a watch differently! Federico Vaga, Matthieu Cattin - - PowerPoint PPT Presentation

Aug 21, 2022 564 likes •1.11k views

F*WATCH, making a watch differently! Federico Vaga, Matthieu Cattin FOSDEM, Brussels, 31 January 2015 Federico Vaga, Matthieu Cattin F*WATCH 1/44 What is it? Federico Vaga, Matthieu Cattin F*WATCH 2/44 What is it? Federico Vaga, Matthieu

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SLIDE 1

F*WATCH, making a watch differently!

Federico Vaga, Matthieu Cattin FOSDEM, Brussels, 31 January 2015

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SLIDE 2

What is it?

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SLIDE 3

What is it?

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SLIDE 4

Why a watch? Retirement gift for a timing Hacker Gift Requirement

1 customization of the gift 2 hackable gift 3 free/open source 4 use only FOSS tools Federico Vaga, Matthieu Cattin F*WATCH 3/44

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SLIDE 5

Development organization

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SLIDE 6

The design

Components selection criteria Low power consumption Available in small quantity from main suppliers Small size (footprint)

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SLIDE 7

Components selection

Micro-controller (EFM32) Silicon Labs 32-bit Cortex-M3 1MB flash 128kB RAM 1.1uA deep sleep

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SLIDE 8

Components selection

GPS module Antenova 13 x 9.5 x 1.8mm Integrated antenna

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SLIDE 9

Components selection

Altimeter module (pressure sensor) Measurement Specialties 6.4 x 4 x 2.8mm Water-resistant Includes a thermometer

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SLIDE 10

Components selection

Memory LCD display Sharp 128 x 128 pixels 1.28 inches Ultra low current

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SLIDE 11

Components selection

Battery Adafruit Li-ion 500mAh Big capacity Lightweight Rechargeable

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Components selection

Other features 3-axis accelerometer + compass Ambient light sensor micro-SD card slot Battery charger + fuel gauge micro-USB connector Buzzer Vibrating motor Foreseen improvements Bluetooth LE Low noise amplifier for the GPS antenna Power management

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SLIDE 13

PCB design

CERN is contributing Developers in the team (help, bugfix, feedback) New features making routing easier (e.g push&shove) Script to generate placement pdf Interested in knowing more about KiCad developments? Visit the EDA dev room (AW1.124) tomorrow

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SLIDE 14

PCB design

Characteristics 4 x 4 cm 4 layers Components on both sides Licensed under CERN OHL v1.2

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SLIDE 15

PCB assembly & validation

Prototypes assembled by hand Fully working, except two minor bugs Error in a datasheet MCU interrupt scheme → Fixed with few cuts and wires!

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SLIDE 16

Backlight

A long story... To read display in the dark No backlight available

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SLIDE 17

Backlight

First try: LEDs + opaque Plexiglas

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Backlight

First try: LEDs + opaque Plexiglas Not good!

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SLIDE 19

Backlight

Second try: Recycled smartphone backlight

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SLIDE 20

Backlight

Second try: Recycled smartphone backlight Better, but...

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Backlight

Current try: Custom-made module → Low quantity, cheap (< 5$/pces)

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Backlight

Current try: Custom-made module → Low quantity, cheap (< 5$/pces) The solution

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Mechanical design

CAD tool selection No mechanical engineer No experience in 3D design/printing Evaluate existing free CAD tools FreeCAD, OpenSCAD, Open CASCADE, ...

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SLIDE 24

Mechanical design

CAD tool selection No mechanical engineer No experience in 3D design/printing Evaluate existing free CAD tools FreeCAD, OpenSCAD, Open CASCADE, ... Criteria Documentation, support User-friendliness, learning curve

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SLIDE 25

Mechanical design

CAD tool selection No mechanical engineer No experience in 3D design/printing Evaluate existing free CAD tools FreeCAD, OpenSCAD, Open CASCADE, ... Criteria Documentation, support User-friendliness, learning curve Decided to use FreeCAD

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SLIDE 26

Mechanical design

Full of new challenges Learn FreeCAD from scratch Design a watch case 3D print it

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SLIDE 27

Mechanical design

Full of new challenges Learn FreeCAD from scratch Design a watch case 3D print it

It’s time for a live demo!

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SLIDE 28

3D model

Making of movie (6 hours summarised in 5 minutes) http://www.ohwr.org/projects/f-watch/wiki/Movies

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First 3D print

Fused plastic material - Low-cost 3D printer Poor resolution, not good enough

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Second 3D print

Plastic material (powder) Good resolution, but not smooth, not water-proof

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SLIDE 31

Third 3D print

Resin material Smooth, water-proof, but bad fastening

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Forth 3D print

Resin material Improved case parts fastening

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Mechanical design

The buttons

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Building the watch

Buy electronics/mechanical components Download circuit Gerber files and order PCB Assemble the board Download case/button models and order 3D print Buy/build a programmer (bootloader) Optional: Milling machine (Plexiglas)

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Building the watch

Software Download sources from the GIT repo No binary releases (yet) Compile bootloader and flash it (using a programmer) Compile application sw and flash it (using the bootloader) Modify, re-flash, test, etc... git://ohwr.org/f-watch.git

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How much does it costs?

Estimated cost for small series (without shipping) Number of watches 1 10 50 Pcb + components 175 C 94 C 81 C Pcb assembly

  • 118 C

67 C Case + buttons + screws 68 C 67 C 61 C TOTAL per watch 243 C 278 C 209 C TOTAL 243 C 2’784 C 10’455 C 3D print : 60 C PCB : 77 C Pressure sensor : 19 C GPS module : 19 C Display : 17 C

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SLIDE 37

MCU SDK free and open source software A lot of integration examples Well documented

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SLIDE 38

Bootloader free bootloader provided by SiliconLab support for IAR, Keil uVision migrate to gcc toolchain (don’t use gcc optimization!)

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Operating System

FreeRTOS uC/OS-III RTX TNKernel License

  • Mod. GPL

restrictive BSD BSD EFM32 yes yes yes no USB no yes no yes FAT no yes no yes

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Operating System FreeRTOS nice documentation big community a lot of examples Keil RTX nice documentation community? few examples

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SLIDE 41

Graphic tiny 2D graphic library adapt the library to our screen Features write text draw simple geometry and icons event management

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Applications

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Interface

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Demo

Applications demonstration video

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Documentation www.ohwr.org/projects/f-watch/wiki how to configure your machine how to write applications details about the project

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Development Summary free PCB design free mechanic design free software free tools free time

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SLIDE 47

Development Summary free PCB design free mechanic design free software free tools free time free development for free products

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SLIDE 48

Free Development Needs Free Tools

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Free Development Needs Free Tools

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Easy to Make How difficult can it be? Competitive free tools Specialized company in 3D printing Specialized company in PCB manufacturing Easy to ship everywhere

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SLIDE 51

Next Generation Free-Open Source Free products are real cars, robots, watches, bikes, houses, phones, ... 3D Metal printers

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What can it be?

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Join Us Not a real product Make it a good example Join the project

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