Howdy y'all,

This is a side project of mine to build a replacement circuit board for the Casio 3208 module, used in the Casio CA-53W and CA-506 calculator watches. It is not compatible with the 3228 module used in the Databank watches, which have four external buttons instead of two. As a side project, it has no warranty whatsoever and you shouldn't use it for anything.

In the rare case that you find this project to be useful, you owe me a pint of good, hoppy pale ale. All license to use this project is revoked if you try to pass off a pilsner instead.

This project is not yet public, but it will eventually be open source. Please give me time to verify it first.

73 from Pizza Rat City, --Travis

Software Status

Our firmware is freely available in this repository, compiling with the standard MSP430 compiler packages that ship with Debian. It consists of a Clock, a Stopwatch, an RPN Calculator, and a Hex Memory Viewer with Disassembler, all written in C. It compiles in Debian with all of the MSP430 packages installed.

Additionally, we've written out own client for the CC430's BootStrap Loader (BSL). You might find it handy for other projects involving that chip, or other MSP430F5 and MSP430F6 chips without USB. You will need to be a member of the dialout group to flash the firmware.

Firmware documentation can be built with Doxygen.

Hardware Status

Our replacement board is based around the CC430F6137, which combines an MSP430 microcontroller with an LCD controller and a sub-GHz radio.

The initial version, the GoodWatch10, lacks a filter chain for the radio and is only useful for verifying the correctness of the non-radio portion of the design. The design is confirmed to be functional, and Travis is wearing one for daily use. Assembly of the GoodWatch10 is a bit difficult, as components are 0201 wherever possible and the central chip is QFN.

The GoodWatch20 gerber files have been finalized, and boards have been ordered. It adds support for sound and a 433MHz radio.

See BOM.txt in the hardware directories for a parts list, and the wiki for an assembly guide.