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created 2023/05/30 modified 2023/05/31 category hardware views 14
the casio f91-w is the classic inexpensive digital watch from casio used for bomb-making, known for its
sensorwatch makes a board replacement for the watch that makes use of all the existing parts of the watch -- so you get an ARM processor with full control over display segments and gpio extensibility, retaining the battery life and good timekeeping of the classic
it retails 9 for the board itself and for the temp + gpio breakout pcbs (shipping for us/8 worldwide)
very inceteful resources on f91-w modding that summarizes a lot of common and some unique mods
i attempted to 3d print a larger back for the watch that could house an attiny85, a female usb c port, and gpio headers; the idea being it could act as a portable rubber ducky or extended with a module with a battery for the microcontroller to do stuff and thing
it failed after i could not successfully solder tiny wires free hand without a protoboard AND keep the connections from eventually short-circuiting or breaking completely :c
