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The churches in my area recently held a camp meeting, and my brother was in charge of one of the kids’ groups. He asked me to design an attendance system that involved badges with the kids’ photos and a barcode on them. They would scan those badges to gain entry into the “top secret lab” and us staff would have an automatic, accurate attendance system. (From comments I heard after the event, this system also helped give our program an additional “quality polish” as the badges turned out well.)
The system that emerged is called BadgeEntry. After successfully using it for our event, I’ve decided to release it to the public.