# How to read non-voltage-free switches via Shelly

**URL:** <https://discourse.nodered.org/t/how-to-read-non-voltage-free-switches-via-shelly/86264>\
**Category:** Hardware\
**Created:** [8 March 2024 07:23 UTC](https://discourse.nodered.org/t/how-to-read-non-voltage-free-switches-via-shelly/86264 "2024-03-08T07:23:11Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![BartButenaers](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bartbutenaers/32/10476_2.png) [@BartButenaers](https://discourse.nodered.org/u/BartButenaers)\
**Post date:** [8 March 2024 23:23 UTC](https://discourse.nodered.org/t/how-to-read-non-voltage-free-switches-via-shelly/86264/8 "2024-03-08T23:23:49Z")

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Based on all the input, I am now tempted to go for one Shelly Uni for each garage door opener. With a din-rail holder, it looks like a decent solution: very simple wiring, similar web interface as my other Shellies, supports MQTT like my other Shellies.

When I look at the wiring diagram of Shelly Uni, it looks to me like my garage door opener sensors behave like in the part highlighted with the red arrow:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/1/5/1500c973b2293b89bd534b1efbcede9b3df6c315.jpeg)

That would mean that the wiring between my garage door opener and a Shelly Uno could be very simple:

| Description | Garage door opener | Shelly Uno |
| --- | --- | --- |
| GND | pin 1 | pin 2 |
| VCC (24 Volt DC) | pin 3 | pin 1 |
| Sensor door open | pin 5 | pin 7 |
| Sensor door closed | pin 6 | pin 8 |

Unless somebody sees a blocking error (through his electronic glasses...), I am going to order a couple of Uno's...

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