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@Jeltron I didn't know about that, I like the concept. A simplistic smoothing algorithm is do-able, maybe harder for advanced ones (kalman, etc). Making a note. 
Re etch-a-sketch:
- I should try adding MBC7 accelerometer support. Might be fun.
- I got a gb-303 music cart from IG and was thinking about adding support for drawing with it's knobs (here's video of a little test app I made to read the knobs). 
@cobb Thanks, that's helpful to know!
I'm not yet sure why some QR Apps won't scan the code. Might be some url validation in them which rejects mime encoded blobs.
@Jeltron That's a great idea. Easy to prototype too.
Any thoughts about the cursor motion/inertia? I wanted it to be a little easier to draw curves instead of just straight and diagonal, but it's tricky to balance that with against precision and not being too sluggish.
@trashheap Thanks! Forgot to make it public. Fixed
If you draw something I'd love to see it!
Also interested in hearing which QRCode scanners + web browser combos work for sharing the drawings.
Draw on the Game Boy and share direct to your phone with a #QRCode! No extra hardware and without the internet.
QR-Paint is a small paint program for the #GameBoy with a fun way to export drawings.
- 96x96, B&W due to QRCode size and no PNG compression yet
- Emulator .sav file can be opened in paint programs as a png (last drawing exported as QRCode)
https://bbbbbr.itch.io/game-boy-qr-paint
- Cursor movement could still use improving
- Open Source