Good evening.
I have a traditional door knocker on my house and its in keeping with the property but my father is never able to hear it. Instead of buying a doorbell i was going to use a sensor on the back of the door to register it.
You have to use some force so i think it would work. Does anyone have any hardware suggestions for something that would register the thump/ vibration?
Extra points for tips on avoiding it going off every time you open the door.
Thanks
Nick
This one maybe:
Depending on the force of the knock, an Aqara vibration sensor might do the job and it plays nice with Homey. But if itās a gentle knock Iām afraid it might not detect any vibration.
When tapping the link I immediately thought itās a must haveā¦
Then I saw the price 
. $156 for 1 device. No way
Also I wonder whether the Knocki device is more sensitive than the Aqara vibration sensor suggested by @Marty_Spargo. Does anyone have hands-on experience with the Knocki?
111,90 ā¬ / approx. 128 $ incl. shipping to Germany.
But of course, still far too expensive.
@FranklyEpic, there are some Homey compatible vibration sensor available. However, I donāt know if these sensors are really suitable for this use case, because I guess it depends also on the intensity of the door vibration..
All Apps are compatible with Homey Bridge and Homey Pro.
(I mentioned it on purpose because you didnāt mention which homey you useā¦ 
)
In combination with a door/window sensor and a timer app (only possible with Homey Pro), I guess it will be not that problem. Btw, I assume that the false alarm problem occurs when the door is closed, which causes stronger vibrations than when the door is opened.
Whenā¦
ā The vibration alarm turned on
Andā¦
ā The contact alarm is off
Orā¦
ā The timer is not running
Thenā¦
ā Turn light on / Let the light flash
ā Start timer for e.g. 2 minutes
If the door remains open for longer than the duration of the timer and is then closed, a false alarm could possibly be triggered.
You may also use a motion sensor to monitor the entrance area. Only if no movement is detected and the vibration sensor detects vibrations, thenā¦
So nobody will be able to offer you a solution that works one hundred percent, you will have to test things out yourself.
I just wrote them an email if there is a possibility to to make an integration with Homey. By Knocki, Homey or by a developer in the community.
See if they respond
It seems that this device works on WiFi and batteries. Typically that combination means a relatively short battery life. Though aan add-on module is available, at an extra cost, to connect it to USB power.
Acc. to their webpage, itās possible to communicate via HTTP requests (Link).
But because I have no programming / informatics skills, I canāt say if it would work without an extra Homey app. I guess with the HTTP request flow cards App it should work, but this app isnāt supported by HP23.
FYI Dirk, and other readers, the āKnockiā should send a webhook to Homey. No need for apps:
https://webhook.homey.app/your_homey_id/my_event?tag=my_tag
Local:
http://my_homey_ip/webhook?event=my_event&tag=my_tag
This webhook can be ācatchedā with this logic trigger card
Thanks Peter.
Next month Iām in the states. I will try to find one cheaper than @DirkG suggested. Otherwise I will try dirkās suggestion.
I need to convince the wife though. Normall I click my fingers I order to bring me my bear. For free
I assume you mean 
ā¦ 
.
Awesome feedback thank you all.
Will check those devices and maybe test the aqara.
Thanks again
The Knocki wasnāt my recommendation, and I hadnāt heard of it before either.
I know Dirk. I meant the ā¬111,90 suggestion you made in post 6
