# Thresholds missing in Dynamic Hysterises

**URL:** <https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179>\
**Category:** General\
**Created:** [15 June 2021 13:34 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179 "2021-06-15T13:34:40Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![KrishnanRavichandran](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/krishnanravichandran/32/44858_2.png) [@KrishnanRavichandran](https://discourse.nodered.org/u/KrishnanRavichandran)\
**Post date:** [15 June 2021 13:34 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/1 "2021-06-15T13:34:41Z")

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Can someone explain the working or application of Dynamic Hysterises? I am new to Node red and find it difficult to make use without understanding.

Also, when I try to use it, I get the 'Thresholds missing' error.  
Thanks in advance.

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [15 June 2021 15:02 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/2 "2021-06-15T15:02:22Z")

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Are you using a contribution node for hysteresis? Unless you tell us what it is we don't know what you are using.

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**Author:** ![KrishnanRavichandran](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/krishnanravichandran/32/44858_2.png) [@KrishnanRavichandran](https://discourse.nodered.org/u/KrishnanRavichandran)\
**Post date:** [15 June 2021 15:40 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/3 "2021-06-15T15:40:41Z")

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I am using Hysteresis for an application where the relay must be switched on based on the lowest value from the 8 input sensors.

for eg: 8 input pressure sensors are connected and the minimum of them are found. I want the light to switch on if the pressure is above x value and switch off when the pressure is below y value.

I can use fixed hysterises here, but how can i use or what is the advantage of using dynamic?

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [15 June 2021 15:44 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/4 "2021-06-15T15:44:55Z")

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Are you asking about the concept of dynamic hysteresis (whatever that is) or its use in a particular node? If you are talking about the concept then I have never heard of it.

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**Author:** ![KrishnanRavichandran](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/krishnanravichandran/32/44858_2.png) [@KrishnanRavichandran](https://discourse.nodered.org/u/KrishnanRavichandran)\
**Post date:** [15 June 2021 16:08 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/5 "2021-06-15T16:08:40Z")

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If you select an Hysterises node, you have option to select fixed and dynamic

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [15 June 2021 16:35 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/6 "2021-06-15T16:35:58Z")

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> [@KrishnanRavichandran](#):
>
> an Hysterises node

Which node is it?

[https://flows.nodered.org/search?term=hysteresis](https://flows.nodered.org/search?term=hysteresis)

Please provide a link to it from the ↑ library

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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:** [14 August 2021 16:36 UTC](https://discourse.nodered.org/t/thresholds-missing-in-dynamic-hysterises/47179/7 "2021-08-14T16:36:41Z")

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