So I had a thought on this. And for all I know the same could apply to Zomet’s inventions and the Shabbos Mode ovens. But anyway here’s the thing:
The switch doesn’t operate like other cases of grama or hasoras hamone’a, like the jugs of water or opening the door involving the wind and the candle, because the light emitter and detector are both part of the same unit and connected to the same computer. It’s not like there are two different things that are occurring, like in the traditional examples, fire here, water there; wind here, candle there. It’s a single implement that has its own internal workings–it’s a glorified “what position is the switch in” detector. Now, if there were two separate devices or even two separate computers in one device, I could see, because then it would be two separate things and they would coincidentally happen to interact. But with it all being connected to a single computer it doesn’t seem to fit the mold of the cases of grama in the mekoros.