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addictingclipsman asked Anyone know of a device that senses a smoke detector going off and activates like an outlet or something?
I need something to sense the smoke detectors beeping, and activate something that is plugged in. maybe a light or something
And got the following answer:
I don't know of ready made sources unless you buy the smoke alarm that goes with them. Usually these are not battery smoke alarms, and you are looking for an external relay. If you can obtain a smoke alarm with a relay output using passive contacts that would be what you need. These contacts could then operate a larger relay which is used to switch power to a wall type socket as you suggest. There are several possible methods... A microphone close by. If there is a suitable LED indicator, an opto sensor. Monitor the total current drawn from the battery. Make a connection across the alarm sounder. All these methods need additional electronics and processing to amplify the signals and operate a relay. You would have to make them yourself, though a Voice Operated switch may be available. It would just need desensitising. If you are electronically inclined, the circuit in the link below shows how to do it with certain mains powered alarms that put out a voltage signal. I have modified this circuit to suit a battery powered alarm, though I have not tried it. If you are interested send me an email with your email address or somewhere I can forward it to.