mirror of
https://github.com/travisgoodspeed/goodwatch
synced 2024-11-21 23:58:31 +00:00
100 lines
4.1 KiB
Markdown
100 lines
4.1 KiB
Markdown
Howdy y'all,
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This is a side project of mine to build a replacement circuit board
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for the Casio 3208 module, used in the Casio CA-53W and CA-506
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calculator watches. It is not compatible with the 3228 module used in
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the Databank watches, which have four external buttons instead of two.
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As a side project, it has no warranty whatsoever and you shouldn't use
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it for anything.
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In the rare case that you find this project to be useful, you owe me a
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pint of good, hoppy pale ale. All license to use this project is
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revoked if you try to pass off a pilsner instead.
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In addition to the source code, there is handy documentation in the
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[wiki](https://github.com/travisgoodspeed/goodwatch/wiki) and a
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general interest website at [goodwatch.org](https://goodwatch.org/).
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The wiki's
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[DeveloperGuide](https://github.com/travisgoodspeed/goodwatch/wiki/DeveloperGuide)
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page might be particularly handy.
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73 from Knoxville,
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--Travis
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## Software Status
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Our firmware is freely available in this repository, compiling with
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the standard MSP430 compiler packages that ship with Debian. It
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consists of a
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[Clock](https://github.com/travisgoodspeed/goodwatch/wiki/ClockApplet),
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a Stopwatch, an RPN Calculator, and a [Hex Memory
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Viewer](https://github.com/travisgoodspeed/goodwatch/wiki/HexApplet)
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with Disassembler, all written in C. It compiles in Debian with all
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of the MSP430 packages installed.
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On watches with a radio, we have
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[Morse](https://github.com/travisgoodspeed/goodwatch/wiki/MorseApplet)
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and GFSK transmitters, as well as an [OOK
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transmitter](https://github.com/travisgoodspeed/goodwatch/wiki/OOK_Example)
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that will command cheap remote-controlled relays. It has a [frequency
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counter](https://github.com/travisgoodspeed/goodwatch/wiki/CounterApplet).
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The radio is accessible from a host computer over the UART for
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building base stations and repeaters, or for rapidly prototyping radio
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applications in Python. P25 and DMR support might come soon.
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Additionally, we've written our own client for the CC430's BootStrap
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Loader (BSL). You might find it handy for other projects involving
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that chip, or other MSP430F5 and MSP430F6 chips without USB. You will
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need to be a member of the `dialout` group to flash the firmware.
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## Hardware Status
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Our replacement board is based around the CC430F6147, which combines
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an MSP430 microcontroller with an LCD controller and a sub-GHz radio.
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Thanks to pin compatibility, our fancy linker scripts produce a
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firmware image that works just as well on the older CC430F6137
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chip.
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The
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[GoodWatch30](https://github.com/travisgoodspeed/goodwatch/wiki/GoodWatch30)
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is our current hardware revision, with filters that run from 300 MHz
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to either 500MHz or 915MHz. The GoodWatch20 family had narrower
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filters at 433MHz, but is still supported.
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See `BOM.txt` in the hardware directories for a parts list, and the
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wiki for an assembly guide.
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## Related Projects
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[Pluto](https://github.com/carrotIndustries/pluto) is a replacement
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PCB for the Casio F-91W that is also based on an MSP430. We happily
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use that project's [energy
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monitor](https://github.com/carrotIndustries/energytrace-util)
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utility for measuring our power budget.
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[FaradayRF](https://faradayrf.com/) is a CC430 radio board intended
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for amateur use, with a 500mW amplifier and GPS receiver. Their radio
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chain is far more carefully designed than ours, but in time, we hope
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that the two projects will communicate with each other.
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[openchronos-ng-elf](https://github.com/BenjaminSoelberg/openchronos-ng-elf)
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seems to be the most recently maintained firmware for TI's OpenChronos
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devkit, which uses the CC430F6137. See Adam Laurie's
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[ChronIC](http://adamsblog.rfidiot.org/2013/03/you-can-ring-my-bell-adventures-in-sub.html)
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project for an early example of sniffing OOK traffic and replaying it
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from a watch.
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The [CharlieWatch](https://github.com/osresearch/charliewatch) from
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Trammell Hudson is a nice little fork of the GoodWatch that uses a
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charlieplexed array of LEDs instead of a Casio watchcase.
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[iceSIO](https://github.com/icelord75/icesio) matches the same Casio
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3208 casings as the GoodWatch, but uses a PIC16 platform with
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accelerometer, compass and environmental sensors.
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