Let's talk creative uses for Lux (Luminence) sensors

[sburke781]

@Inge_Jones

Yes I remember that but can't find it now

Could this be it?

Sensor to detect LED on/off

Looking for a sensor that can be put over an LED and open/close depending on whether the LED is on or off. Example use cases would be detecting whether dryer is on or off, a cooking surface is hot or not, etc. These would be cases where wiring directly into the LED circuitry isn’t practical. In my case, I want to detect when a Robovac is docked or not (there is a rather bright LED on top that shines when the vac is not docked). There was mention in a thread about “LED identification sensor” but…