# Send message only when there is a change
**URL:** https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523
**Category:** General
**Created:** [31 May 2021 20:23 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523 "2021-05-31T20:23:39Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [31 May 2021 20:23 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/1 "2021-05-31T20:23:39Z")
Hi all,
I'm trying to send a telegram messsage only once when there is a change in the scale(peso)
This is the switch node:
I try to use a trigger node as trigger&block but only works once, I have no idea how to reset this node.
Thanks in advance
---
### Author:  [@hardillb](https://discourse.nodered.org/u/hardillb)
#### Post date: [31 May 2021 20:47 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/2 "2021-05-31T20:47:39Z")
Look at the rbe (report by exception) node
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [31 May 2021 21:16 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/3 "2021-05-31T21:16:50Z")
I try with this node but I need to put a low limit
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [31 May 2021 21:41 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/4 "2021-05-31T21:41:45Z")
Use an RBE to prevent duplicates then a switch node to test the value of \> low limit.
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [1 June 2021 05:05 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/5 "2021-06-01T05:05:15Z")
I try it, but it doesn't work
It send the same weight always, without changes
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [1 June 2021 12:46 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/6 "2021-06-01T12:46:12Z")
What is the data coming in?
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [1 June 2021 13:12 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/7 "2021-06-01T13:12:58Z")
Its a number
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [1 June 2021 15:12 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/8 "2021-06-01T15:12:01Z")
Sorry let me be more specific. Can you provide a series of data coming in that shows the issue you are experiencing
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [1 June 2021 15:27 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/9 "2021-06-01T15:27:14Z")
ok, I Take some pictures:
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [1 June 2021 15:27 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/10 "2021-06-01T15:27:48Z")
Two more
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [1 June 2021 16:04 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/11 "2021-06-01T16:04:55Z")
Are they enough?
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [1 June 2021 16:59 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/12 "2021-06-01T16:59:26Z")
Can you provide your flow and I’ll take a look at it
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [1 June 2021 17:42 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/13 "2021-06-01T17:42:27Z")
```auto
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```
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [1 June 2021 18:42 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/14 "2021-06-01T18:42:49Z")
Please put a debug node on the output of the HX711 node so I can see what the data is coming in.
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [2 June 2021 14:50 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/15 "2021-06-02T14:50:06Z")
Or you prefer the code
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [2 June 2021 16:13 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/16 "2021-06-02T16:13:25Z")
So the first value that comes thru is (trimming decimals for brevity) 898.8577 and the second is 898.9508
The RBE node says "don't pass anything thru that is not greater than 10% of the last valid value. So the first value is 898.8577 and 10% of that is 89.8857.
So for a value to pass thru it has to be
greater than 898.8577 + 89.8857 = 988.7434
or less than
898.8577 - 89.8857 = 808.9726
but the value is 898.9508 so it isn't passed thru.
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [2 June 2021 16:38 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/17 "2021-06-02T16:38:18Z")
I don't understand you. 😪
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [2 June 2021 16:57 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/18 "2021-06-02T16:57:47Z")
with what you have defined in the `rbe` node, a value would have to be greater than 998.7434 or less than 808.89726 to be passed thru the `rbe` node.
What is not to understand?
---
### Author:  [@arzur](https://discourse.nodered.org/u/arzur)
#### Post date: [2 June 2021 17:00 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/19 "2021-06-02T17:00:11Z")
ah ok. But my problem its that without a change of 10% the rbe allow the data
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### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [2 June 2021 17:20 UTC](https://discourse.nodered.org/t/send-message-only-when-there-is-a-change/46523/20 "2021-06-02T17:20:58Z")
So explain what you want to happen.
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