I once built an ultrasonic cat impeller to keep our cat off the bed and it worked like a charm, for a while. I used a PIR detector, which tripped off a short burst of random frequency ultrasonic sound for a few seconds. What I failed to take into account was that the fact learned that he could jump on the bed, be subjected to a brief annoyance, and then lay down and go to sleep. Within a week, it didn't bother him at all. He didn't go deaf because I would occasionally see him raise in head and look towards the bedroom, with what I am convinced was a grin, when someone would trip the alarm on the bed.Blackfin wrote:After a while the cameras didn't bother her as much. Either she either got used to the sound or she's deaf to those frequencies now.
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