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 related calculator watches. It is probably 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

Hardware Status

This 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. It is believed to be correct, but has not yet been manufactured or assembled for verification.

Assembly is a bit difficult, as components are 0201 wherever possible and the central chip is QFN.

Software Status

The firmware has not yet been written. We will aim for a GCC-compatible image, focusing first on battery life and watch functionality, only later on fancy radio features. Because of limited power availability, initial applications will be transmit-only.