Pet door mat alarm
作者： Joseph W. Aossey
DOI:
关键词:
摘要: A low voltage battery powered door mat alarm having an buzzer circuit with contact closure by the weight of pet such as a cat walking across to or from animal door. This activates indicate generally that is approaching go out has just returned through positioned inside so must pass over come in
lens.org 参考文章(2)
Eugene W. Fowler, Raymond W. Fowler, Weight or ambient pressure-responsive mechanical pressure switch ,(1981)
Granby Joshua, Levy David, Improvements in and relating to electrical circuit making and breaking devices ,(1964)