# Use Homematic smoke detector as a siren under Nodered

**URL:** <https://discourse.nodered.org/t/use-homematic-smoke-detector-as-a-siren-under-nodered/64629>\
**Category:** General\
**Created:** [3 July 2022 08:53 UTC](https://discourse.nodered.org/t/use-homematic-smoke-detector-as-a-siren-under-nodered/64629 "2022-07-03T08:53:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![pinie\_pinie](https://avatars.discourse-cdn.com/v4/letter/p/ccd318/32.png) [@pinie\_pinie](https://discourse.nodered.org/u/pinie_pinie)\
**Post date:** [3 July 2022 08:53 UTC](https://discourse.nodered.org/t/use-homematic-smoke-detector-as-a-siren-under-nodered/64629/1 "2022-07-03T08:53:00Z")

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Hello,  
I would like to use a Homematic smoke detector under Nodered/Redmatic as a siren. The system runs on RaspberryMatic. I can trigger this function using a script on the Raspberrymatic interface:(datapoints.Get("HmIP-RF.000A5D89B4457C:1.SMOKE\_DETECTOR\_COMMAND")).State(3);  
The smoke detector will then beep three times. Now I want to include this function in Nodered/Redmatic. I use different Homematic nodes. Unfortunately I didn't get any results. Does anyone have a tip for me which node or which syntax is suitable?

Many Thanks

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<div class="post-metadata">

**Author:** ![pinie\_pinie](https://avatars.discourse-cdn.com/v4/letter/p/ccd318/32.png) [@pinie\_pinie](https://discourse.nodered.org/u/pinie_pinie)\
**Post date:** [3 July 2022 12:14 UTC](https://discourse.nodered.org/t/use-homematic-smoke-detector-as-a-siren-under-nodered/64629/2 "2022-07-03T12:14:35Z")

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Hello,

I have found a compromise. I can address my smoke detector via the "value node". The smoke detector beeps three times.  
I didn't find any command that he beeps longer. You could perhaps have the command "3" repeated several times. Then you would have a siren for an alarm system.

Many greetings  
 ![1](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/4/4/44f1a5a5e0f75f9b42b8eee207866f8a584a98a7.png)

 ![2](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/9/396824306b483ca7319aa8ac2cc69911cda0d371.png)  
 ![3](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/f/2f9c755e670d2b89d4b02434342e64b64e6a2a84.png)

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [1 September 2022 12:15 UTC](https://discourse.nodered.org/t/use-homematic-smoke-detector-as-a-siren-under-nodered/64629/3 "2022-09-01T12:15:12Z")

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