# Sonoff with input for external signals

**URL:** <https://forum.ewelink.cc/t/sonoff-with-input-for-external-signals/21475>\
**Category:** Ideas & Suggestion\
**Created:** [September 6, 2023, 11:53am UTC](https://forum.ewelink.cc/t/sonoff-with-input-for-external-signals/21475 "2023-09-06T11:53:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![cjxxcj](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@cjxxcj](https://forum.ewelink.cc/u/cjxxcj)\
**Post date:** [September 6, 2023, 11:53am UTC](https://forum.ewelink.cc/t/sonoff-with-input-for-external-signals/21475/1 "2023-09-06T11:53:37Z")

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Would really like to have a sensor (WiFi) with an input for external signals, e.g. alarm from a heat pump, signal from the home alarm if it is alarmed or an already built-in magnetic contact. I really miss being able to control sonoff stuff with an external signal.

Is that something that SonOff are working on?

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**Author:** ![mt1](https://avatars.discourse-cdn.com/v4/letter/m/53a042/32.png) [@mt1](https://forum.ewelink.cc/u/mt1)\
**Post date:** [September 7, 2023, 3:22pm UTC](https://forum.ewelink.cc/t/sonoff-with-input-for-external-signals/21475/2 "2023-09-07T15:22:04Z")

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It is possible to do this already with the MINIR2, the only downside is it is mains operated. It has inputs for a light switch which you can use to trigger the mini and use scenes to control other devices. You must watch however as these inputs do have a voltage on them, so be careful! I have them connected to my alarm system via a 12v 8 Channel Relay Module with OPTO-Isolated contacts, so they are isolated from each other. It has worked flawlessly for a good couple of years, switching on lights in the event of an alarm and turning devices on and off when we set and unset the alarm.

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**Author:** ![eerke](https://avatars.discourse-cdn.com/v4/letter/e/eb9ed0/32.png) [@eerke](https://forum.ewelink.cc/u/eerke)\
**Post date:** [September 8, 2023, 12:34am UTC](https://forum.ewelink.cc/t/sonoff-with-input-for-external-signals/21475/3 "2023-09-08T00:34:34Z")

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I had always assumed it was just connected to a pin and the low voltage with a low maximum current. What voltage is it?

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**Author:** ![dwdube](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@dwdube](https://forum.ewelink.cc/u/dwdube)\
**Post date:** [September 13, 2023, 1:16pm UTC](https://forum.ewelink.cc/t/sonoff-with-input-for-external-signals/21475/4 "2023-09-13T13:16:20Z")

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Hi @cjxxcj,  
Sonoff does have a door magnetic contact which is wifi operated, model DW2-WiFi. Better yet, they have a zigbee contact which is more reliable.