I have 3 sensors to send data but I need that in case any stops sending data show a message in the dashboard for example when it is active show ON and when it is inactive show OFF, the ideia is create a alert message. If you compare the current value with the previous one and if it is the same it i…

I tried the Trigger and I have the sensor active but I get an OFF, the Inject configuration is as follows: [ { "id": "20020f02.5964a", "type": "inject", "z": "caaedfb9.ac4da", "name": "Inject Inductive Sensor", "topic": "ns=2;s=SensorIndutivo", "p…

maybe re-read the instructions... the key part is to tick the box extend delay if new message arrives .

I do that and the result is the same

The trigger node is not going to look at a value to see if it has changed, it just looks to see msg's are coming in. You say you need to monitor to see if a sensor is not sending data - but first some basic questions: What platform/os are you running on? what version of NR, node.js are you using?…

The platform i´m using is CompactRIO and Labview, the version of Node-Red is [v0.19.5], the sensors sending data every 10 seconds, i´m reading the data between topics of OPC UA (ex. ns=2;s=LM35), more or less the value of temperature is stable. I send the values to a database [image] and i need de…

I’m confused your last example where one sensor is undefined is a valid database entry. What would you want the database to record? Or is it just your dashboard you want to change?

[image] ukmoose: I’m confused your last example where one sensor is undefined is a valid database entry. What would you want the database to record? Or is it just your dashboard you want to change? For Dasboard i only need to show in dashboard a message (text) that says ON or OFF when the se…

so the Trigger node should be able to tell you when you don’t get a value when you expect it. A switch node should be able to separate that from a true value and a change node will be bale then to change msg.payload to On I would suggest you set up some triggers with different values and have a p…

[image] ukmoose: so the Trigger node should be able to tell you when you don’t get a value when you expect it. A switch node should be able to separate that from a true value and a change node will be bale then to change msg.payload to On I would suggest you set up some triggers with differen…

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Message ON/OFF in case one sensor Stop working

General

dceejay 13 February 2019 09:25 2

see - Trigger Email if Input not recevied since x minutes?

Topic		Replies	Views
Show if sensor is ative or inactive General	15	2402	14 February 2019
Checking status of sensor General	3	641	29 June 2021
Check availability of all sensors General	5	116	14 September 2024
Count number of sensors reporting data General function-node	6	539	28 March 2022
The best way to notice lack of message? General	20	3164	2 December 2018

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Message ON/OFF in case one sensor Stop working

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