For watch hackers, there is an alternate PCB with programmable microcontroller available for the F91W https://www.sensorwatch.net/
I got one for Christmas and it has been super fun to hack on. I programmed a new face for mine that displays the current tide level, and next high and low tides.
I got one for Christmas and it has been super fun to hack on. I programmed a new face for mine that displays the current tide level, and next high and low tides.