i love this and its something i had always wanted to try. I am actually kind of ticket off at chatgpt as i asked it about 6 months ago how something like this work and it told me it physically wasnt possible. maybe i need to improve my prompting.
Hacking a Casio F-91W digital watch (2023)
41–50 of 58 posts
Re: Hacking a Casio F-91W digital watch (2023)
#42I was captivated by the introduction but I only made it halfway through before I gave up. The random bolding and emphasizing of almost every other word really put me off. Also, even though I can see that it's clearly had a ton of human effort put into it, I got a lot of AI vibes from the writing.
You can read it in the Medium frontend scribe.rip, to avoid some Medium shenanigans. I do think bolding stays the same though, it seems to have lots of bolding. Weird style.
https://scribe.rip/infosec-watchtower/how-i-hacked-casio-f-9...
Re: Hacking a Casio F-91W digital watch (2023)
#43I was captivated by the introduction but I only made it halfway through before I gave up. The random bolding and emphasizing of almost every other word really put me off. Also, even though I can see that it's clearly had a ton of human effort put into it, I got a lot of AI vibes from the writing.
You can read it in the Medium frontend scribe.rip, to avoid some Medium shenanigans. I do think bolding stays the same though, it seems to have lots of bolding. Weird style. https://scribe.rip/infosec-watchtower/how-i-hacked-casio-f-9...
No, it doesn’t. This isn’t a Medium gripe (which sucks but isn’t to blame for once).
Edit: this comment made sense before the post I replied to was edited to clarify that there is no material difference.
Re: Hacking a Casio F-91W digital watch (2023)
#44Is NanoVNA still the best entry-level tool in 2026?
Re: Hacking a Casio F-91W digital watch (2023)
#45Cool project. Tip: acetone will readily dissolve the plastic parts of the card leaving the antenna(s) and chip intact. I believe a few other people have made drop-in PCBs with NFC antennas. Here’s one: https://n-o-d-e.net/datarunner.html Also, no F-91W thread would be complete without a mention of the sensorwatch project: https://www.sensorwatch.net/
The dissolution in acetone is nicely demonstrated here https://youtu.be/NF4VJJKTjy8?t=835 The guy does it in order to be able to pay with a prosthetic eye.
For anybody wondering wth is with a guy sculpting dioramas about obscure celebrity misadventures - he was formerly half of the Hip-Hop Comedy Duo, Sketch Artists, and behemoth Irish podcasters 'The Rubberbandits'. Probably one of the greatest neo-dadaists and proponents of Aestheticism in Europe today.
https://www.unitedartsclubdublin.com/post/bobby-fingers-the-...
Some might even know them without realising it - their incredibly provocative Richard D. James-esque 'Dad's Best Friend', a sonic assault about isolation and toxic masculinity, was featured prominently in the Trainspotting Sequel, "T2"
Re: Hacking a Casio F-91W digital watch (2023)
#46Well documented!. I hope you don't lose your watch hehe
Re: Hacking a Casio F-91W digital watch (2023)
#47Interesting --- but it looks like a lot of unnecessary work to me.
Forget modifying the watch itself. Instead, build a strap add-on to hold the NFC payment chip and antenna.
Here is a project where I did something similar to carry a microSD memory card.
Re: Hacking a Casio F-91W digital watch (2023)
#48Interesting --- but it looks like a lot of unnecessary work to me. Forget modifying the watch itself. Instead, build a strap add-on to hold the NFC payment chip and antenna. Here is a project where I did something similar to carry a microSD memory card. https://www.thingiverse.com/thing:6784665
Nothing was unnecessary since the goal was having fun & learning.
Re: Hacking a Casio F-91W digital watch (2023)
#49I wish there were a way to put the chip & antenna inside (or behind?) the watch casing. While this is really impressive, putting something in front of the faceplate breaks the great F-91W look and feel for me.
Or just forget the watch and casing and build an add-on to the strap to hold the NFC chip. This should work with any watch strap that isn't metal.
Similar project I did to carry a microSD memory card.
Re: Hacking a Casio F-91W digital watch (2023)
#50I don’t know why Casio doesn’t just do something like this themselves, I’d buy it. Don’t need a super smart watch but do like contactless payment with a wrist.
Apparently, Casio fails to recognize that nowadays, most people don't really need a watch for timekeeping because they carry a smartphone that does time perfectly well.
I wear a cheap $5 Chinese made watch only because I use it to carry a backup of all my crucial data with me at all times, even in the shower. If something goes bump in the night, my data is always with me so all I need to worry about is my own personal safety.
https://www.thingiverse.com/thing:6784665
Casio could easily and cheaply add this to their watches and instantly make them much more desirable in my opinion.