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I built the Loyalty Card Emulator 🪄
(apfelkompott.codeberg.page)
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this post was submitted on 23 Sep 2023
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Privacy
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A place to discuss privacy and freedom in the digital world.
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The reason is that laser scanners use a rotating mirror or lens in front of the laser to create the scanline, and only have a single light cell, detecting rapid changes in red light intensity. They can’t tell where light is coming from so you could trick them into reading a barcode transmitted as a sequence of light pulses from a single source (like an optical mouse’s LED controlled by an Arduino) but not an array of light sources (aka pixels) unless they have different reflectivity as the laser scans across them (such as E-ink). Technically, reflective LCDs could work with laser scanners but transferring the code to a TI-83 calculator is not worth the effort.