Hi! I want to install dark sensing nightlights into my house. They are not triggered by motion but rather when it gets dark. Would that be a problem on Shabbos? My husband thinks that by standing next time, we may make it darker in the room and cause them to turn on. Thanks for answering my question!
There is a lot of discussion among the poskim regarding how to act on shabbos when there are electronic sensors. In your case your husband’s concern is valid, but it should not be a problem, and you can get the sensors. The reason being that when someone stands in the room it is not going to surely activate the sensor, therefore standing in the room will be a davar sheino miskaven, and would be permitted. However to shut the shades of the room, when it will surely activate the sensor and turn on the nightlight would not be permitted. The same would be to stand close up againt the sensor, if it is so close that it is clear that it will turn it on.