3 ms·

I half expected this to have a button/mode to show custom QR codes...

• mcdonje 1y ago
  That's a good idea!
• phirks 1y ago
  I tried, that's why it's 21x21. Still haven't managed to get it to read.
  • hturan 1y ago
    I might be wrong, but you might need need (at least) a 23x23 LED matrix to have a white border around the outside to give it the contrast needed (the "quiet zone", since QR data is black).
    • phirks 1y ago
      This is why my first prototype had a white border around it. The LEDs were red back then, so I don't know exactly what I was thinking, but I was aware of the problem. https://github.com/Nicholas-L-Johnson/flip-card/blob/main/media/IMG_20250809_134121077_AE.jpg https://github.com/Nicholas-L-Johnson/flip-card/blob/main/me...
• nine_k 1y ago
  Could as well display the name and/or email, if rotated just so.