I am using Garadget in MQTT, non cloud setup with OpenHAB. Recently I’ve added a new rule that plays an alert sound as soon as the garage changed from “closed”. Funnily enough, every now and then (about 2-3 times a day), this alert sound would go off without anyone opening the garage door.
This was in my OpenHAB log:
22:18:01.597 [INFO ] [smarthome.event.ItemStateChangedEvent] - Garage_Status changed from closed to opening 22:18:01.608 [INFO ] [smarthome.event.ItemStateChangedEvent] - Garage_Reflection changed from 97 to 65 22:18:02.597 [INFO ] [smarthome.event.ItemStateChangedEvent] - Garage_Status changed from opening to closed 22:18:02.597 [INFO ] [smarthome.event.ItemStateChangedEvent] - Garage_Reflection changed from 65 to 97
So for about 1 second (which probably relates to the sensor scan interval), the reflection dropped from 97 to 65, and went back up to 97.
My threshold (srt) was set to 70.
Meanwhile I have reduced my threshold to 60 (pending further tests), and added a delay so my alert won’t go off unless the door is open for at least 3 seconds.
I don’t want to set my threshold too low, because I don’t want to end up in a situation where the garage door is open but registered as closed, and would rather err on the safe side.
I am curious though, as to what could’ve caused this brief drop in reflection. I wasn’t in the garage when it happened but at this point, we speculated that a gecko might have crossed the laser/reflector. However, I would think that a gecko would have produced a much lower reflection, which makes me wonder still.
Has anyone noticed this phenomenon?