3 ms·

Im not sure I got it. It generates acoustic signals and a microphone server picks them up. If so, will it penetrate through walls?

fragmede 5mo ago
The microphone is on a smart watch the user is wearing.
- croes 5mo ago
  Do you need a signal that tells you the window is open if you are in the same room?
  - hilti 5mo ago
    If you are constantly looking at your smartphone and ignore the real world ... yes ;-)
  - SimplyUnknown 5mo ago
    Obviously not, but there is larger potential than that. A microphone in a watch or phone can pick up the signal and relay the trigger to another server via for example MQTT. Then, you can have homeassistant act upon this signal. The flow is then Open door --> Signal triggers --> Signal caught by microphone --> Microphone device relays to server --> Server turns on smart lighting in that room. There is a lot more that you can do, but this is just an example. The microphone to pick it up is a limitations, but the gain is: - reduced power usage as the signal generators are not power-operated - less waste as no empty batteries need to be discarded (if non-rechargeable batteries are used) - improved security because the signal generators are not connected to the internet, reducing the attack surface.
  - fragmede 5mo ago
    Now imagine you're living with 10 people at a facility/station/factory/depot, and there are 5 windows across a dozen externally facing rooms.
- alberto467 5mo ago
  Can i not trigger the automations from my smart watch then?
  - ga_to 5mo ago
    Sure could, but then you would need to do the thing AND think about doing the triggering and then find the trigger button on your watch. This way you wouldn't have to think about it, because it's automated. Triggering something manually also doesn't really count as 'automation' I would say.
croes 5mo ago
Unlikely because it’s ultrasonic sound, at least if you have brick walls. Could work for drywalls
- jacquesm 5mo ago
  Not a chance. Drywall will absorb this like a sponge. These frequencies are really high and will reflect off hard or thin surfaces, drywall is relatively soft, more often than not has insulation packed into the center and is usually covered in some kind of stucco or grout. Zero chance of penetration. Just stand on the other side of a drywall and see how well high pitched normally audible sounds get through vs the much lower frequency sounds. It sounds decidedly muffled because all the high has been absorbed.
lesuorac 5mo ago
Well, idk if these do but you can certainly make passive devices that penetrate walls. See http://en.wikipedia.org/wiki/The_Thing_(listening_device) http://en.wikipedia.org/wiki/The_Thing_(listening_device)
- jacquesm 5mo ago
  Radio waves != sound waves.

fragmede 5mo ago

The microphone is on a smart watch the user is wearing.

croes 5mo ago
Do you need a signal that tells you the window is open if you are in the same room?
- hilti 5mo ago
  If you are constantly looking at your smartphone and ignore the real world ... yes ;-)
- SimplyUnknown 5mo ago
  Obviously not, but there is larger potential than that. A microphone in a watch or phone can pick up the signal and relay the trigger to another server via for example MQTT. Then, you can have homeassistant act upon this signal. The flow is then Open door --> Signal triggers --> Signal caught by microphone --> Microphone device relays to server --> Server turns on smart lighting in that room. There is a lot more that you can do, but this is just an example. The microphone to pick it up is a limitations, but the gain is: - reduced power usage as the signal generators are not power-operated - less waste as no empty batteries need to be discarded (if non-rechargeable batteries are used) - improved security because the signal generators are not connected to the internet, reducing the attack surface.
- fragmede 5mo ago
  Now imagine you're living with 10 people at a facility/station/factory/depot, and there are 5 windows across a dozen externally facing rooms.
alberto467 5mo ago
Can i not trigger the automations from my smart watch then?
- ga_to 5mo ago
  Sure could, but then you would need to do the thing AND think about doing the triggering and then find the trigger button on your watch. This way you wouldn't have to think about it, because it's automated. Triggering something manually also doesn't really count as 'automation' I would say.

croes 5mo ago

Unlikely because it’s ultrasonic sound, at least if you have brick walls. Could work for drywalls

jacquesm 5mo ago
Not a chance. Drywall will absorb this like a sponge. These frequencies are really high and will reflect off hard or thin surfaces, drywall is relatively soft, more often than not has insulation packed into the center and is usually covered in some kind of stucco or grout. Zero chance of penetration. Just stand on the other side of a drywall and see how well high pitched normally audible sounds get through vs the much lower frequency sounds. It sounds decidedly muffled because all the high has been absorbed.

lesuorac 5mo ago

Well, idk if these do but you can certainly make passive devices that penetrate walls. See http://en.wikipedia.org/wiki/The_Thing_(listening_device) http://en.wikipedia.org/wiki/The_Thing_(listening_device)

jacquesm 5mo ago
Radio waves != sound waves.