Electronic eye

Question

A rabbi (with a very long beard whom I thought was learned) told me that there is a problem walking into a certain area of a hotel lobby on Shabbat because there is an electric eye that flashes. I told him that this was crazy, and if there was ever a pesik resha de-lo nicha leih this is it. But I was wondering, does this also apply to your own house, when you installed the electric eye yourself