Vibration Sensor

[Daniel Feist]

Hi,

Has anyone successfully used a vibration sensor with Loxone?  I've seen various sensors, but they all seem to be piezoelectric and I'm unsure how I'd use this with Loxone.

The use case is to detect movement on a steel staircase and turn on stair tread lighting based on this.

I think there is a Shelly door contact I could use, but it's not particularly small, and I wouldn't be able to hide it under wooden treads as the battery would need replacing.

Thanks!

[David Wallis]

You might Want to look into using strain gauges

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[Daniel Feist]

It's this type of stair, so there will be a small amount of movement/vibration of the steelwork, but no bending: 

https://www.houzz.com/photos/display-home-riviera-65-contemporary-staircase-gold-coast-tweed-phvw-vp~129782271?share=clipboard

[Techdoctor]

Why not use a shelly motion sensor fitted underneath the  first, actual step of the steel staircase, then something similar at the top. Don't know how reliable this set up would be though. Also you would have easy access to re-charge the batteries.

Just found this after a quick google https://www.stellarlighting.co.uk/stair-lighting

[David Wallis]

You under estimate what a strain gauge can measure! That will definitely bend, just need to size it correctly, can be had cheap work had need an amp but worth an test :)

[Nick Everard]

I agree with David load cells/strain garages are very capable in my opinion most suited for this application, one mounted under the upper or lower mounting plate would work a 10kg to 2000kg cell should be sufficient. 

[Daniel Feist]

The stair is already installed which means putting strain gauges under the mounting plates isn't an option, which is why I was considering vibration sensors instead.   The thing is you clearly can't hook up a piezoelectric directly to Loxone, but maybe I could try an "Acceleration & Shock Switch".  I'd have to try different ones with different activation levels though.

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[Techdoctor]

Is there such a thing as a 0-10V vibration sensor, this with the right extension would work with Loxone

[DanF]

There isn't such thing as a 0-10v vibration sensor, no, not that I found anyway. If there was one, this would work well as I could configure a threshold in Loxone and wouldn't require extra hardware.

What I did found was:

- strain/load cell or gauge. (needs hx711)

- piezoelectric devices with a small weight that detect vibrations (needs additional hardware though, but not sure what yet)

- acceleration/shock switch.  These come with different thresholds, the smallest being 2 - 4.9g.

Load cell would have been the best option if stairs weren't already installed.,  But now they are, I might need to experiment with some of the other approaches. 

[Techdoctor]

Did some googling and found that you can get  vibration sensors and strain sensors that output a 4-20 mA signal, then saw this article on how to convert 4-20mA to 0-10Vdc. 

https://www.industrialshields.com/blog/arduino-industrial-1/post/how-to-convert-a-4-20ma-to-0-10v-signal-in-a-arduino-plc-80

[David Wallis]

https://www.ebay.co.uk/itm/Current-Voltage-Module-4-20mA-0-10V-Isolation-Transmitter-Signal-Converter-/393022834102?var=0&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338268676&toolid=10044&customid=EAIaIQobChMI1_i7n9_08gIVErrtCh258AR-EAQYASABEgLLKfD_BwE

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