i thought it worked like that too, an ordinary webcam sensor, but if you put it too close to the sensor, it would just block all the light and register as black
You can make it work. Girl at Burning Man came up to me once and said, “I’m going to steal your colour!” then tapped her magic wand on my shirt. Her LED dress changed to my shirt’s colour. It was rad. I think the sensor was from Sparkfun?
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But seriously; thst’s brilliant.
https://hackaday.io/project/170377-wurlitzer-key-note-visualizer-replica
https://shop.m5stack.com/products/rfid-unit-2-ws1850s
That makes sense.