# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=203

[Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md)

**Page:** 204

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## [Remote I/O erro on reading data from I2C bus on Raspberry Pi](https://discourse.nodered.org/t/remote-i-o-erro-on-reading-data-from-i2c-bus-on-raspberry-pi/78817)

<div class="topic-metadata">

**Author:** [@Miliks](https://discourse.nodered.org/u/Miliks)\
**Replies:** 47\
**Last updated:** [8 June 2023 15:05 UTC](https://discourse.nodered.org/t/remote-i-o-erro-on-reading-data-from-i2c-bus-on-raspberry-pi/78817 "2023-06-08T15:05:13Z")

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i've been using the i2c nodes to read data from the SHT21 sensor connected to Raspberry Pi. I can read the data using the Python script on the same board, so i was trying to replicate it on node-red. But with no luck. I …

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## [How to send a csv file to google drive or to a server](https://discourse.nodered.org/t/how-to-send-a-csv-file-to-google-drive-or-to-a-server/79057)

<div class="topic-metadata">

**Author:** [@issambfs1](https://discourse.nodered.org/u/issambfs1)\
**Replies:** 0\
**Last updated:** [8 June 2023 14:42 UTC](https://discourse.nodered.org/t/how-to-send-a-csv-file-to-google-drive-or-to-a-server/79057 "2023-06-08T14:42:32Z")

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hi i try to send csv file from raspberry to a google drive or to server with ip fix and port 21 . one more thing the pi and server not in the same network any ideas how can i do that

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## [Decrypt LoRa packet](https://discourse.nodered.org/t/decrypt-lora-packet/79046)

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**Author:** [@NEX](https://discourse.nodered.org/u/NEX)\
**Replies:** 2\
**Last updated:** [8 June 2023 14:15 UTC](https://discourse.nodered.org/t/decrypt-lora-packet/79046 "2023-06-08T14:15:14Z")

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Hi for all I'm a newbie to node red , I'm trying to receive and send a LoRa packet to my server. I put a TCPin to listen on a port and I get a similar packet as string 01879004:ffffffcf0000005a10020100; or as buffer 4…

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## [Custom domains for dashboard endpoint](https://discourse.nodered.org/t/custom-domains-for-dashboard-endpoint/78988)

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**Author:** [@gregorius](https://discourse.nodered.org/u/gregorius)\
**Replies:** 9\
**Last updated:** [8 June 2023 13:34 UTC](https://discourse.nodered.org/t/custom-domains-for-dashboard-endpoint/78988 "2023-06-08T13:34:35Z")

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Hi There! A thought occurred to me and I was wondering whether its possible - can I configure Node-RED to server the dashboard on a custom domain? For example https://demo.openmindmap.org/ui becomes https://website.ope…

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## [Temperature Control Sequence](https://discourse.nodered.org/t/temperature-control-sequence/79010)

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**Author:** [@FHI](https://discourse.nodered.org/u/FHI)\
**Replies:** 2\
**Last updated:** [8 June 2023 13:19 UTC](https://discourse.nodered.org/t/temperature-control-sequence/79010 "2023-06-08T13:19:27Z")

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Hi can someone please assist me in designing a sequencing unit / node for temperature control. The aim of the unit is to have a dashboard icon where i can input the following parameters; Target temperature, Ramp rate, a…

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## [How to activate-deactivate nodes?](https://discourse.nodered.org/t/how-to-activate-deactivate-nodes/79052)

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**Author:** [@AleksKan](https://discourse.nodered.org/u/AleksKan)\
**Replies:** 2\
**Last updated:** [8 June 2023 12:41 UTC](https://discourse.nodered.org/t/how-to-activate-deactivate-nodes/79052 "2023-06-08T12:41:03Z")

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Hi everyone! I made a flow as shown, and I want to make two buttons. One button has to activate Function1 section and deactivate Function2 section. Another button has to do vice versa. Is it possible to do it? Looks lik…

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## [Multiple input output PID controller](https://discourse.nodered.org/t/multiple-input-output-pid-controller/78955)

<div class="topic-metadata">

**Author:** [@FHI](https://discourse.nodered.org/u/FHI)\
**Replies:** 30\
**Last updated:** [8 June 2023 12:32 UTC](https://discourse.nodered.org/t/multiple-input-output-pid-controller/78955 "2023-06-08T12:32:17Z")

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Hi I have a project where i need to control two analog inputs on a thyristor. I currently use two separate PID controllers. PID1 generates a output based on the process temperature and Set point. PID2 generates a output …

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## [Node function with node template](https://discourse.nodered.org/t/node-function-with-node-template/79050)

<div class="topic-metadata">

**Author:** [@Loveflowersx](https://discourse.nodered.org/u/Loveflowersx)\
**Replies:** 2\
**Last updated:** [8 June 2023 12:30 UTC](https://discourse.nodered.org/t/node-function-with-node-template/79050 "2023-06-08T12:30:18Z")

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Hi everyone, I want to join the function node with the template node, I have tried many ways and nothing, I pass the code I think it is ok. The variables come from a s7 node. It works the two codes together in a functi…

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## [Wanting to use a msg payload for blob name](https://discourse.nodered.org/t/wanting-to-use-a-msg-payload-for-blob-name/79040)

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**Author:** [@Felix\_Cheah](https://discourse.nodered.org/u/Felix_Cheah)\
**Replies:** 1\
**Last updated:** [8 June 2023 09:35 UTC](https://discourse.nodered.org/t/wanting-to-use-a-msg-payload-for-blob-name/79040 "2023-06-08T09:35:06Z")

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I'm trying to upload a file to azure blob and wanting to name the blob based on a msg payload. I tried the below but the blob name ends up being {{{title}}}. How do I use a msg payload to fill out a property in a node? …

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## [\[Meetup Request\] Berlin](https://discourse.nodered.org/t/meetup-request-berlin/78860)

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**Author:** [@gregorius](https://discourse.nodered.org/u/gregorius)\
**Replies:** 7\
**Last updated:** [8 June 2023 09:34 UTC](https://discourse.nodered.org/t/meetup-request-berlin/78860 "2023-06-08T09:34:27Z")

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Hi There! I am posting this in General since this isn't an Event but an request for an Event! Are there any DE-Berlin timezone people interested in getting together to have a chat about NR? I've checked the meetup gro…

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## [Addressing in nodes S7](https://discourse.nodered.org/t/addressing-in-nodes-s7/79042)

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**Author:** [@Loveflowersx](https://discourse.nodered.org/u/Loveflowersx)\
**Replies:** 4\
**Last updated:** [8 June 2023 08:19 UTC](https://discourse.nodered.org/t/addressing-in-nodes-s7/79042 "2023-06-08T08:19:19Z")

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Hi everyone, In the data block I have addresses with USInt (Unsigned Short Int) and I don't know how to put that addressing in the s7 node for the Node-RED board. Here is all the addressing I tried this one but noth…

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## [Need help choose env sensor hardware](https://discourse.nodered.org/t/need-help-choose-env-sensor-hardware/78937)

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**Author:** [@brendonhatcher](https://discourse.nodered.org/u/brendonhatcher)\
**Replies:** 4\
**Last updated:** [7 June 2023 19:20 UTC](https://discourse.nodered.org/t/need-help-choose-env-sensor-hardware/78937 "2023-06-07T19:20:13Z")

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I am developing an educational resource for teaching IoT to teens. I want to create an open build that other people can replicate. My core unit is a Raspberry Pi running Node-RED etc. I want to add a secondary unit wi…

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## [Cron-plus send current schedule on deploy/start-all](https://discourse.nodered.org/t/cron-plus-send-current-schedule-on-deploy-start-all/79027)

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**Author:** [@SeRiusRod](https://discourse.nodered.org/u/SeRiusRod)\
**Replies:** 0\
**Last updated:** [7 June 2023 14:55 UTC](https://discourse.nodered.org/t/cron-plus-send-current-schedule-on-deploy-start-all/79027 "2023-06-07T14:55:52Z")

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I have a question for users of the node node-red-contrib-cron-plus. Is there a way for making sending the current active schedule o deploy or when activating the node itself? I have an automation where I do different t…

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## [Keep contents of multiple change nodes synchronised](https://discourse.nodered.org/t/keep-contents-of-multiple-change-nodes-synchronised/79018)

<div class="topic-metadata">

**Author:** [@JohnnyPicnic](https://discourse.nodered.org/u/JohnnyPicnic)\
**Replies:** 8\
**Last updated:** [7 June 2023 14:15 UTC](https://discourse.nodered.org/t/keep-contents-of-multiple-change-nodes-synchronised/79018 "2023-06-07T14:15:36Z")

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Is it possible to synchronize the contents of a node across multiple flows? I'm using a change node to change one part of a message that can come in from multiple http endpoints and each endpoint has it's own separate w…

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## [Node information connected to your output](https://discourse.nodered.org/t/node-information-connected-to-your-output/79002)

<div class="topic-metadata">

**Author:** [@rlmariz](https://discourse.nodered.org/u/rlmariz)\
**Replies:** 8\
**Last updated:** [7 June 2023 13:02 UTC](https://discourse.nodered.org/t/node-information-connected-to-your-output/79002 "2023-06-07T13:02:21Z")

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I'm in a project where the current node depends on information from the node connected to its output, what better way to do this? Thanks

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## [Re: Identifying running port of Node Red](https://discourse.nodered.org/t/re-identifying-running-port-of-node-red/78979)

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**Author:** [@RobC](https://discourse.nodered.org/u/RobC)\
**Replies:** 2\
**Last updated:** [7 June 2023 07:37 UTC](https://discourse.nodered.org/t/re-identifying-running-port-of-node-red/78979 "2023-06-07T07:37:32Z")

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Continuing the discussion from Port number of running node-red instance: @knolleary you mentioned that the admin port was available using RED.settings.port Following on from the suggested solution in the linked post,…

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## [Node-red-contrib-bigtimer offset not working](https://discourse.nodered.org/t/node-red-contrib-bigtimer-offset-not-working/78997)

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**Author:** [@jowa](https://discourse.nodered.org/u/jowa)\
**Replies:** 3\
**Last updated:** [7 June 2023 05:55 UTC](https://discourse.nodered.org/t/node-red-contrib-bigtimer-offset-not-working/78997 "2023-06-07T05:55:34Z")

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Hi, with the node-red-contrib-bigtimer, if I set an "on offsset" = -7200, it does not work. How can I tell big timer to start 2 hours before the sunset ? The reason is that I have solar power to start the water pomp t…

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## [Initiate Download without New Window](https://discourse.nodered.org/t/initiate-download-without-new-window/78998)

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**Author:** [@jgreenmt](https://discourse.nodered.org/u/jgreenmt)\
**Replies:** 1\
**Last updated:** [6 June 2023 21:26 UTC](https://discourse.nodered.org/t/initiate-download-without-new-window/78998 "2023-06-06T21:26:49Z")

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Hello All, I have a flow that generates a ui-table of files available in a directory. When a user clicks on the file in the table, it is sent into a ui-template node that uses window.open to navigate to the page where a…

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## [To add and remove a user defined button,as?](https://discourse.nodered.org/t/to-add-and-remove-a-user-defined-button-as/78982)

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**Author:** [@jaime](https://discourse.nodered.org/u/jaime)\
**Replies:** 4\
**Last updated:** [6 June 2023 18:02 UTC](https://discourse.nodered.org/t/to-add-and-remove-a-user-defined-button-as/78982 "2023-06-06T18:02:04Z")

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In the help document for node-red-contrib-web-worldmap 2.37.4, in its section: "Controlling the map" and following all the options it offers, I see that some do not work, or I don't know how to apply them very well in my…

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## [\[Solved\] Having trouble creating a valid PDF from a buffer that is returning the contents of a PDF (API call)](https://discourse.nodered.org/t/solved-having-trouble-creating-a-valid-pdf-from-a-buffer-that-is-returning-the-contents-of-a-pdf-api-call/78989)

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**Author:** [@UmbraLimi](https://discourse.nodered.org/u/UmbraLimi)\
**Replies:** 11\
**Last updated:** [6 June 2023 15:27 UTC](https://discourse.nodered.org/t/solved-having-trouble-creating-a-valid-pdf-from-a-buffer-that-is-returning-the-contents-of-a-pdf-api-call/78989 "2023-06-06T15:27:22Z")

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Hi, I have an HTTP Request node successfully bringing in the data that is the contents of a PDF (according to that vendor's API). The data successfully arrives as a Buffer. What I need to do now is create a PDF from th…

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## [Deactive create .backup files in data folder](https://discourse.nodered.org/t/deactive-create-backup-files-in-data-folder/78992)

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**Author:** [@larslehman1](https://discourse.nodered.org/u/larslehman1)\
**Replies:** 0\
**Last updated:** [6 June 2023 15:08 UTC](https://discourse.nodered.org/t/deactive-create-backup-files-in-data-folder/78992 "2023-06-06T15:08:27Z")

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I'm running Nodered over Docker Rootless. Can I turn off the creation of .backup files? These only cause problems in docker rootless mode I use Node-RED Version 3.02 Thank you for your help

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## [Modbus Server with node-red Docker - Port forwarding required?](https://discourse.nodered.org/t/modbus-server-with-node-red-docker-port-forwarding-required/78096)

<div class="topic-metadata">

**Author:** [@Darren](https://discourse.nodered.org/u/Darren)\
**Replies:** 11\
**Last updated:** [6 June 2023 14:08 UTC](https://discourse.nodered.org/t/modbus-server-with-node-red-docker-port-forwarding-required/78096 "2023-06-06T14:08:44Z")

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I've got a Modbus TCP server running in node-red, which is running via Docker. Unfortunately, this server is unreachable, so I'm thinking it needs port forwarding to outside the Docker container - can anyone confirm this…

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## [Trigger on condition](https://discourse.nodered.org/t/trigger-on-condition/78985)

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**Author:** [@SoAu](https://discourse.nodered.org/u/SoAu)\
**Replies:** 2\
**Last updated:** [6 June 2023 10:27 UTC](https://discourse.nodered.org/t/trigger-on-condition/78985 "2023-06-06T10:27:25Z")

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Hi Guys, I have function node returning msg, either 2 or 5. I just need to trigger some function if msg=2 not on any other msg. Thanks !!

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## [Best input device for open close](https://discourse.nodered.org/t/best-input-device-for-open-close/78927)

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**Author:** [@btbr](https://discourse.nodered.org/u/btbr)\
**Replies:** 13\
**Last updated:** [6 June 2023 09:15 UTC](https://discourse.nodered.org/t/best-input-device-for-open-close/78927 "2023-06-06T09:15:38Z")

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Hello All, I need a device that I can input an open/close state of a relay. Could anyone please recommend one that is easy to use? Can be ethernet or wifi. Hope everyone is having a great day!

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## [Floorplan with svg](https://discourse.nodered.org/t/floorplan-with-svg/78942)

<div class="topic-metadata">

**Author:** [@Mateiuc](https://discourse.nodered.org/u/Mateiuc)\
**Replies:** 9\
**Last updated:** [6 June 2023 07:14 UTC](https://discourse.nodered.org/t/floorplan-with-svg/78942 "2023-06-06T07:14:13Z")

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firs.pdf (5.4 KB) Hi to all, i try to do an floorplan with svg editor, but after hours of deleting triangle... ...I get tired.... Someone know how to do an floorplan like in pdf file... at least, I will like it 3d.…

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## [When the timestamp period is 0.1s, the deployment becomes stuck](https://discourse.nodered.org/t/when-the-timestamp-period-is-0-1s-the-deployment-becomes-stuck/78949)

<div class="topic-metadata">

**Author:** [@baishu](https://discourse.nodered.org/u/baishu)\
**Replies:** 18\
**Last updated:** [6 June 2023 06:51 UTC](https://discourse.nodered.org/t/when-the-timestamp-period-is-0-1s-the-deployment-becomes-stuck/78949 "2023-06-06T06:51:39Z")

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When the timestamp period is 0.1s, the deployment becomes stuck. How can I optimize it

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## [HTML-parse extract value from javascript](https://discourse.nodered.org/t/html-parse-extract-value-from-javascript/78671)

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**Author:** [@DaZeller](https://discourse.nodered.org/u/DaZeller)\
**Replies:** 11\
**Last updated:** [6 June 2023 06:11 UTC](https://discourse.nodered.org/t/html-parse-extract-value-from-javascript/78671 "2023-06-06T06:11:13Z")

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Hello there, once again I have a flow to read values from my Heating-Systems Web-UI an puts the data into an SQL-DB. First part to the problem was solved by @E1cid (thank you again) here: html-parce-to-sql-flow-optimiza…

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## [How to find the size of mqtt data in python](https://discourse.nodered.org/t/how-to-find-the-size-of-mqtt-data-in-python/78862)

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**Author:** [@Johnson](https://discourse.nodered.org/u/Johnson)\
**Replies:** 6\
**Last updated:** [5 June 2023 19:00 UTC](https://discourse.nodered.org/t/how-to-find-the-size-of-mqtt-data-in-python/78862 "2023-06-05T19:00:36Z")

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Hi, I need to find the packet size of a mqtt data in python. My question is, how can i find the mqtt packet size which include the control header, packet length, variable length header and payload . At the moment i am…

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## [Change Watt Number in Normal number](https://discourse.nodered.org/t/change-watt-number-in-normal-number/78973)

<div class="topic-metadata">

**Author:** [@TheJoJo](https://discourse.nodered.org/u/TheJoJo)\
**Replies:** 1\
**Last updated:** [5 June 2023 19:13 UTC](https://discourse.nodered.org/t/change-watt-number-in-normal-number/78973 "2023-06-05T19:13:40Z")

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Hello, please excuse my bad english. In my IoBroker, I want a number in an adapter, e.g. Convert "197.20000000000002 W" to a 'normal' number like e.g. "197" how could I realize this in Node Red? TheJoJo

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## [Import of same flow - doesnt result in replace/copy message](https://discourse.nodered.org/t/import-of-same-flow-doesnt-result-in-replace-copy-message/78908)

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**Author:** [@SandeepA](https://discourse.nodered.org/u/SandeepA)\
**Replies:** 6\
**Last updated:** [5 June 2023 16:37 UTC](https://discourse.nodered.org/t/import-of-same-flow-doesnt-result-in-replace-copy-message/78908 "2023-06-05T16:37:17Z")

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Hi , Not sure why i did not notice this before - when i import a flow (tab) to an env (NR instance) which has that flow already - i dont get any popups on replace/copy. Every time a new copy gets created. (While for s…

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