Nice work but a pity they will have to redo it once their payment card expires.
Hacking a Casio F-91W digital watch (2023)
21–30 of 58 posts
Re: Hacking a Casio F-91W digital watch (2023)
#22Cool 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.
This is hilarious!
Re: Hacking a Casio F-91W digital watch (2023)
#23Cool 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.
I would like to encourage everyone to set some time aside, get comfy, and watch Bobby Fingers. His videos are extraordinary, special, things.
I think making a giant Jeff Bezos boat would appeal most to this crowd, but I'd suggest watching them in order.
Re: Hacking a Casio F-91W digital watch (2023)
#24I want to put a better backlight in my A158W. Internally F-91W and A158W are same.
n-o-d-e (blogger) has published many mods for this watch, with videos included. They have great production quality, and the mods are easy enough to pull off. https://n-o-d-e.net/casio.html
When I did this mod, I soldered the LED on its side, so that it shone directly onto the LCD. This made the watch face much brighter.
On reflection, the similar variant of the watch with an EL display is vastly superior. The A168 is similar to the A158 you mentioned but with a better light.
Re: Hacking a Casio F-91W digital watch (2023)
#25that was very well documented! great job
Re: Hacking a Casio F-91W digital watch (2023)
#26I’ve been doing Apple Pay without issue with the phone since it started, and doing it without authentication since the Apple Watch came out. The (very) few issues wouldn’t be fixed by putting the system in a different case. Seems like a lot of work for nothing.
This is Hacker News is it not? I'm sure if this guy wanted to buy an Apple watch, he could have just done that.
Re: Hacking a Casio F-91W digital watch (2023)
#27Another good effort and well intentioned piece ruined by soulless AI writing. If English is not your primary language, it’s ok. Rather write with mistakes and quirks: it would still feel more human and readable than a draft flattened and weakened by using chatGPT
I think going by the timestamp of the article and checking the article on a couple of AI detectors, that this article has a low probability of being written by GPT.
More than likely just translation anomalies from Italian to English.
Re: Hacking a Casio F-91W digital watch (2023)
#28hacking f-91w been very popular https://en.wikipedia.org/wiki/Casio_F-91W#Usage_in_terrorism
That's because the F91W was like Game Boy of watches. Or the Tetris under a 'Brick Game' branded cheap console. Every dad owned one. Reliable, cheap and damn long lasting.
Re: Hacking a Casio F-91W digital watch (2023)
#29These F-91W projects inspired me to buy one, but I found it to be so small (and I don't have a particulary big wrist). So I gave it to my 12 year old and bought a W-217H, which is almost identical but larger.
Re: Hacking a Casio F-91W digital watch (2023)
#30The problem with this approach is, every once in a while - I think the bank sets the limit - the card will not accept any NFC transactions at all until a physical confirm-with-pin transaction is made. That frankenstein'd chip... no way it can ever be assembled back into a "holder" card without risking everything breaking.
Yes, at least according to the information I have, the card issuer sets the limit. It's not clear to me if the chip actually has to be physically slotted in for reading it, though. Can the confirm-with-pin step be done without contact, using NFC feature?
For me, it'll randomly ask for the pin code as OP reported, but card insertion is never required.