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With the screwdriver that came with my eye glasses repair kit, I disassembled the watch, revealing the original #casio circuit board, one of the seven wonders of 1980's consumer electronics.
#sensorwatchpro
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My Sensor Watch Pro just arrived!
Time to take apart my Casio wristwatch to install it! ...as soon as I can find my tiny philips screwdriver.
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It runs on an open source custom firmware called Second Movement and has a custom 92 segment LCD that improves the watch's display/readability. I availed of the accelerometer sensor/add-on board that opens a lot of possibilities.
Oh, and it also has a full RGB LED.
Learn more at: https://www.crowdsupply.com/oddly-specific-objects/sensor-watch-pro
Crowd SupplySensor Watch ProA more hackable ARM Cortex M0+ brain upgrade for Casio's iconic F-91W
It's here! Made it to the #Philippines in one piece.
The #SensorWatchPro is a drop-in PCB for the iconic F-91W or A158W created by @joeycastillo (Oddly Specific Objects) with lots of cool features!
It's hackable, programmable, and built to be modular. Just my kind of tech.
Now I just need to decide which of my F-91Ws is going to get the upgrade. 
Oh look what arrived here in Spain today:
@joeycastillo's Sensor Watch Pro via @crowdsupply 
I was a little bit worried doing the watch surgery, as I am rather clumsy, but it took me less than 30 minutes until the watch was back together, and I didn't even need to watch the instruction video!
Well done for such a neat and well-documented package, Joey!