I used something like this on a large sheet and cut it into pieces for a puzzle gift to a website where people left comments. Nowadays even easier to generate nice temporary websites for such things.
I found this page very helpful in understanding each step of the QR code creation process. I can't say I recall it all but it would be possible to turn this into a small booklet, I guess.
From the update: "Why are QR Codes with capital letters smaller than QR codes with lower-case letters?" https://shkspr.mobi/blog/2025/02/why-are-qr-codes-with-capit... (https://news.ycombinator.com/item?id=43149077)
If someone needs a gift idea:
I used something like this on a large sheet and cut it into pieces for a puzzle gift to a website where people left comments. Nowadays even easier to generate nice temporary websites for such things.
I hand drew this on a whiteboard. It was a lot more work than I anticipated.
http://lars.nocrew.org/tmp/qr.png
By the way, I also coded a QR symbol generator in PDP-10 assembly language.
https://github.com/PDP-10/its/blob/master/src/lars/qrcode.8
One time I tried to understand the QR algorithm and I didn't understand it at all despite trying multiple times.
Maybe I can try again with the help of LLMs. Hmm not a bad idea
I found this page very helpful in understanding each step of the QR code creation process. I can't say I recall it all but it would be possible to turn this into a small booklet, I guess.
https://typefully.com/DanHollick/qr-codes-T7tLlNi
Here's a HN discussion from 2022 about it.
https://news.ycombinator.com/item?id=32837565