I have a Dettol automatic soap dispenser (see fig. 1) which uses a little propellor-type pump to let out a small amount of soap when you put your hand in front of the passive IR sensor.It's been working fine until just before, when I turned the lights off in the kitchen (night time, so moderate brightness became pitch black). And out of the blue, the bloody thing wakes up and ejaculates soap all over my kitchen sink. I wasn't even remotely close to the device.I considered reflections off the stainless steel sink, but it's never done this before, and sure enough when I switch the light from elsewhere, the dispenser still triggers. So this rules out any IR interference getting to the device.Turns out the device is also triggered by by torch, and the nearby dining room lights. But it only triggers when any of these lights are turned off, not on - in other words, it is triggered by drop in brightness, not increase.My second thought was that there might be an IR-pass lens just before the sensor, which might be degrading, causing changes in visible light to be picked up by the sensor. But this seems like a bit of a stretch.Another idea is that there is some sensitivity-control logic which automatically adjusts tendency to release soap. Perhaps the microcontroller hit a bug. I'm yet to try resetting the device (battery powered), but I'm not sure how this would be explained since it's at least a year since the batteries were changed, and I've never experienced this before.Anyway, ideas would be appreciated so that I don't have nightmares about my house flooded with soap.
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