Topic: Sound signal on door discovery
All greetings! Councils about the following problem are required. It is given: the old person, problems with a head, in a state of to supervise that would be desirable in a toilet, but not in a state to provide to itself hygiene after the made. For this reason it is required to know always, when it goes to a toilet to be in time "" and to help with this hygiene. It would be desirable: to deliver on a door of a toilet the sensor which would publish loud enough sound, audible in other parts of apartment, at discovery of a door of a toilet. Electronics I do not understand almost absolutely. Prompt where to look or advise specific variants. There is an alternative - simply to suspend on a door a hand bell, but there is a suspicion that it will be not so well audible. In advance thanks.