I am an absolute newbie to NR, and have received help with flows from my son. My goal is to try and create a flow that will compare the temperature difference between two sensors and have my ceiling fans come on. I have a tp link HS200 wall switch, and two sensors that are already recognized by HA. …

[image] connie: I am researching the Json functions. Why? You have the join bit working - yes? Copy and paste/share the message here and any problems can be ironed out. Though I am near the bottom in terms of skills, I don't think there is any benefit in doing what you want using JSON stuf…

[{"id":"19a820dcdccc45cf","type":"join","z":"26f1cb2b488b3697","name":"join both sensors","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"","count":"2","reduceRight":false,"reduceExp":"","reduceI…

You really need to practice how to paste things. That isn't usable as is.

You need to post the message. Not the nodes. So on the right of the screen (in the debug window) do as I explained in one of my posts to copy the message and paste it.

12/15/2021, 10:28:53 PMnode: join debug upstairstemp : msg : Object object _msgid: "4e881ba11c5356a6" payload: object topic: "upstairstemp" data: 0 Is this correct?

No. If it is/was correct, the payload would be expandable. It is shown as an object.

There’s a great page in the docs that will explain how to use the debug panel. Pay particular attention to the part about the buttons that appear under your mouse pointer when you over hover a debug message property in the sidebar. [BX00Cy7yHi] https://nodered.org/docs/user-guide/messages So whe…

Thank you for responding. You are absolutely correct. I am an absolute beginner. I will definitely watch mode red essential. That’s exactly what I am looking for. Btw. I was able to write the code to calculate the difference between sensors. Small accomplishment but I’m excited. Connie Connie.bie…

For future reference, the home assistant Events:state node that you'd be using as a trigger has the ability to change the msg.topic without needing a change node. Just scroll down to Output Properties and you'll see msg.topic. Change it to a string and type whatever topic you'd like. By default it …

Thank you for your ideas, and I will certainly incorporate them on my next project. Presently, I have been able to use the function node to calculate the difference, but haven't had any success to create an output that will trigger the ceiling fan. Do you know how I would write the code in the func…

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Automate ceiling fans using temperature difference between sensors

General

connie 28 December 2021 06:27 75

Thank you everyone for your help. I was able to get the automation of the ceiling fans using temperature difference to work successfully. I'll post the solution soon

1 Like

Topic		Replies	Views
Compare 2 sensors General	21	1368	30 August 2022
Compare inside temp to outside General	24	13111	30 January 2021
Multiple temperatures controlling one fan General	11	392	23 March 2023
IF Statement for two DS18B20 Sensors General	32	2330	6 July 2020
Empty values on template Dashboard node-red-dashboard	16	1078	12 October 2021

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Automate ceiling fans using temperature difference between sensors

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