# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=55

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

**Page:** 56

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## [Best practice for sequential operations on a robot?](https://discourse.nodered.org/t/best-practice-for-sequential-operations-on-a-robot/94926)

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**Author:** [@Palmhoej](https://discourse.nodered.org/u/Palmhoej)\
**Replies:** 8\
**Last updated:** [2 February 2025 14:59 UTC](https://discourse.nodered.org/t/best-practice-for-sequential-operations-on-a-robot/94926 "2025-02-02T14:59:26Z")

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So i am doing this little home project: Its a small Dobot MG400 robot arm that takes my families old pictures, put them into a scanner, takes them out and on and on it goes. It works using TCP, so I will inject a…

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## [How many cron-plus nodes in one application](https://discourse.nodered.org/t/how-many-cron-plus-nodes-in-one-application/94966)

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**Author:** [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Replies:** 3\
**Last updated:** [2 February 2025 13:33 UTC](https://discourse.nodered.org/t/how-many-cron-plus-nodes-in-one-application/94966 "2025-02-02T13:33:18Z")

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I need to manage 13 different day time schedules in 13 flows. Each schedule has about 5 schedules. Would it make sense to have one big Cron-plus node with 13\*5 schedules or 13 Cron-plus nodes (one per flow) with 5 sched…

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## [Modbus values goes zero after change and deploy](https://discourse.nodered.org/t/modbus-values-goes-zero-after-change-and-deploy/95055)

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**Author:** [@BambosD](https://discourse.nodered.org/u/BambosD)\
**Replies:** 5\
**Last updated:** [2 February 2025 11:32 UTC](https://discourse.nodered.org/t/modbus-values-goes-zero-after-change-and-deploy/95055 "2025-02-02T11:32:47Z")

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Hello everyone, I'm new to node-red and i want to use it for modbus values / store / preview / dashboard. there is a strange behavior and i don't know if i'm missing something or is some kind of bug. as you can see he…

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## [How to properly configure the two image comparison (diff) function in node/node-red-contrib-image-tools?](https://discourse.nodered.org/t/how-to-properly-configure-the-two-image-comparison-diff-function-in-node-node-red-contrib-image-tools/95063)

<div class="topic-metadata">

**Author:** [@satim2025](https://discourse.nodered.org/u/satim2025)\
**Replies:** 1\
**Last updated:** [2 February 2025 09:25 UTC](https://discourse.nodered.org/t/how-to-properly-configure-the-two-image-comparison-diff-function-in-node-node-red-contrib-image-tools/95063 "2025-02-02T09:25:47Z")

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How to properly configure the two image comparison (diff) function in node/node-red-contrib-image-tools? what you need to specify in the image2 input field when setting the path to the second image file. I did not find t…

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## [Help with RS-232 serial message from scale](https://discourse.nodered.org/t/help-with-rs-232-serial-message-from-scale/95040)

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**Author:** [@grant1](https://discourse.nodered.org/u/grant1)\
**Replies:** 6\
**Last updated:** [1 February 2025 13:36 UTC](https://discourse.nodered.org/t/help-with-rs-232-serial-message-from-scale/95040 "2025-02-01T13:36:34Z")

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I have changed brands of a weigh scale with RS-232 output that is used in a program. I notice that the string length alternates between 18 and 19 characters (there seems to be a leading . present in the 19-character mess…

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## [Node-red freezing on deployment](https://discourse.nodered.org/t/node-red-freezing-on-deployment/94954)

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**Author:** [@ruffieuxh](https://discourse.nodered.org/u/ruffieuxh)\
**Replies:** 17\
**Last updated:** [31 January 2025 17:27 UTC](https://discourse.nodered.org/t/node-red-freezing-on-deployment/94954 "2025-01-31T17:27:23Z")

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Hello, I am using node-red (currently on v3.1.9) for several years on a pi 3 for energy automation tasks like EV charging, Solar battery management etc. The installation has been working flawlessly so far. Since few da…

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## [Convert mqtt output to number](https://discourse.nodered.org/t/convert-mqtt-output-to-number/95038)

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**Author:** [@rojas489](https://discourse.nodered.org/u/rojas489)\
**Replies:** 2\
**Last updated:** [31 January 2025 17:12 UTC](https://discourse.nodered.org/t/convert-mqtt-output-to-number/95038 "2025-01-31T17:12:35Z")

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I have an mqtt output of this type {“ts”: “2025-01-31T16:24:29Z”, “humidity”:56} and I am unable to convert it to number to make it readable in influxdb or grafana which is my ultimate goal. Any help on this?

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## [Modbus communication with HEX codes](https://discourse.nodered.org/t/modbus-communication-with-hex-codes/95024)

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**Author:** [@jacekelgda](https://discourse.nodered.org/u/jacekelgda)\
**Replies:** 2\
**Last updated:** [31 January 2025 13:02 UTC](https://discourse.nodered.org/t/modbus-communication-with-hex-codes/95024 "2025-01-31T13:02:46Z")

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I am trying to setup a simple flow where I would like to send a HEX code to a device attached to a TCP modbus gate. I have a function that creates a message and payload which connects to a flex modbus getter using config…

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## [Looking for a countdown timer for long periods](https://discourse.nodered.org/t/looking-for-a-countdown-timer-for-long-periods/95019)

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**Author:** [@Technogeek](https://discourse.nodered.org/u/Technogeek)\
**Replies:** 2\
**Last updated:** [31 January 2025 09:45 UTC](https://discourse.nodered.org/t/looking-for-a-countdown-timer-for-long-periods/95019 "2025-01-31T09:45:04Z")

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I'm looking for a Countdown Timer that I can use in a Tumbler Automation System. Here's what I'm looking for, a countdown timer that displays Days, Hours, Minutes and Seconds similar to the node-red-contrib-ui-digital-cl…

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## [NO Broker Available error in node-red version 3.1.10 V](https://discourse.nodered.org/t/no-broker-available-error-in-node-red-version-3-1-10-v/95022)

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**Author:** [@gautamt572](https://discourse.nodered.org/u/gautamt572)\
**Replies:** 1\
**Last updated:** [31 January 2025 08:53 UTC](https://discourse.nodered.org/t/no-broker-available-error-in-node-red-version-3-1-10-v/95022 "2025-01-31T08:53:36Z")

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We are getting below error in sometime in node-red flows because of this data flow is impacting ,could you please help why this error occurs in node red frequecntly. \[error\] Kafka Broker { "label": "Metadata refresh …

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## [Node-Red on home assistant – does not want to write to sd disk with system](https://discourse.nodered.org/t/node-red-on-home-assistant-does-not-want-to-write-to-sd-disk-with-system/94994)

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**Author:** [@Le-Ze](https://discourse.nodered.org/u/Le-Ze)\
**Replies:** 8\
**Last updated:** [31 January 2025 07:53 UTC](https://discourse.nodered.org/t/node-red-on-home-assistant-does-not-want-to-write-to-sd-disk-with-system/94994 "2025-01-31T07:53:38Z")

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Hi. I have installed home assistant on raspberry pi and I am trying node-red. OS Version: Home Assistant OS 14.2 Home Assistant Core: 2025.1.4 Node write file does not have access to write to sd card where system is. …

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## [Toggle Node with Reset](https://discourse.nodered.org/t/toggle-node-with-reset/94953)

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**Author:** [@Technogeek](https://discourse.nodered.org/u/Technogeek)\
**Replies:** 16\
**Last updated:** [31 January 2025 05:31 UTC](https://discourse.nodered.org/t/toggle-node-with-reset/94953 "2025-01-31T05:31:04Z")

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I have a very simple flow with the Toggle Node and since I'm quite new to Node Red I'm confused as to where I should go to add a Reset input onto it. At this point I know almost nothing about Java Script and I haven't be…

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## [Writing text that contains single and double quotes to an Sqlite table](https://discourse.nodered.org/t/writing-text-that-contains-single-and-double-quotes-to-an-sqlite-table/95014)

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**Author:** [@tribbles3](https://discourse.nodered.org/u/tribbles3)\
**Replies:** 5\
**Last updated:** [31 January 2025 01:29 UTC](https://discourse.nodered.org/t/writing-text-that-contains-single-and-double-quotes-to-an-sqlite-table/95014 "2025-01-31T01:29:48Z")

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I need to write data to sqlite that contains single and double quotes. I was able to INSERT the data with the following code using a function node and the data is written to the table with all the quotes intact. let id …

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## [Do I want credentialSecret if I use environment variables in node properties?](https://discourse.nodered.org/t/do-i-want-credentialsecret-if-i-use-environment-variables-in-node-properties/94852)

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**Author:** [@glossyio](https://discourse.nodered.org/u/glossyio)\
**Replies:** 9\
**Last updated:** [30 January 2025 18:00 UTC](https://discourse.nodered.org/t/do-i-want-credentialsecret-if-i-use-environment-variables-in-node-properties/94852 "2025-01-30T18:00:02Z")

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Looking for best practice on this: If I use environment variables (set via the environment when Node-RED is run as a service) in my configuration node properties, do I need or even want a credentialSecret (in settings.js)…

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## [Puppeteer/ chromium help](https://discourse.nodered.org/t/puppeteer-chromium-help/94979)

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**Author:** [@aredhone](https://discourse.nodered.org/u/aredhone)\
**Replies:** 12\
**Last updated:** [30 January 2025 17:30 UTC](https://discourse.nodered.org/t/puppeteer-chromium-help/94979 "2025-01-30T17:30:05Z")

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hay guys im trying to connect my node red through whatsapp with whatsapp-link the lite version disconects every phew minutes so i want to use whatsapp web i have installed node-red-contrib-whatsapp-link node-red-contri…

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## [Help event state](https://discourse.nodered.org/t/help-event-state/95009)

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**Author:** [@aredhone](https://discourse.nodered.org/u/aredhone)\
**Replies:** 0\
**Last updated:** [30 January 2025 17:25 UTC](https://discourse.nodered.org/t/help-event-state/95009 "2025-01-30T17:25:26Z")

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im compleetly sure im overlooking somthing i just cant get this to work but another sensor that checks my phone battery works \[{"id":"2250ef66abdcfa10","type":"function","z":"e18d369e682983cf","name":"tokenvalue functio…

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## [Question about changing integral time on node-red-contrib-pid](https://discourse.nodered.org/t/question-about-changing-integral-time-on-node-red-contrib-pid/94987)

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**Author:** [@Buzzylogic](https://discourse.nodered.org/u/Buzzylogic)\
**Replies:** 4\
**Last updated:** [30 January 2025 13:58 UTC](https://discourse.nodered.org/t/question-about-changing-integral-time-on-node-red-contrib-pid/94987 "2025-01-30T13:58:23Z")

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I have an application I'd like to change the Integral time on the fly, so to speak, is doing so going to have adverse effects on the PID (like resetting it, so it's like restarting?)

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## [Version pinning for external packages](https://discourse.nodered.org/t/version-pinning-for-external-packages/94982)

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**Author:** [@Bergstein](https://discourse.nodered.org/u/Bergstein)\
**Replies:** 9\
**Last updated:** [30 January 2025 12:40 UTC](https://discourse.nodered.org/t/version-pinning-for-external-packages/94982 "2025-01-30T12:40:31Z")

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Hi, all. First post here, searched for similar questions, didn't find any. I am interested in version pinning for external packages (those in Setup tab of Function node). Tried to use "package@version" notation, in a l…

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## [Complexity of join, simplify flow?](https://discourse.nodered.org/t/complexity-of-join-simplify-flow/94992)

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**Author:** [@ThingsTinkerer](https://discourse.nodered.org/u/ThingsTinkerer)\
**Replies:** 4\
**Last updated:** [30 January 2025 11:34 UTC](https://discourse.nodered.org/t/complexity-of-join-simplify-flow/94992 "2025-01-30T11:34:02Z")

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This is a slightly different topic from me. I got something that works. But it feels a bit complex, so looking for possible simplifications. Been experimenting with joins lately to combine multiple msg to a single object…

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## [Pushover - play a custom notification sound](https://discourse.nodered.org/t/pushover-play-a-custom-notification-sound/95001)

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**Author:** [@Le-Ze](https://discourse.nodered.org/u/Le-Ze)\
**Replies:** 3\
**Last updated:** [30 January 2025 10:08 UTC](https://discourse.nodered.org/t/pushover-play-a-custom-notification-sound/95001 "2025-01-30T10:08:24Z")

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Hi. https://pushover.net/sounds/build I have uploaded custom notification sound. I don't see them in the pushover node – sound. Is there a way to fix this? Thank you.

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## [Energy Counter & Reset](https://discourse.nodered.org/t/energy-counter-reset/94961)

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**Author:** [@Egge](https://discourse.nodered.org/u/Egge)\
**Replies:** 6\
**Last updated:** [30 January 2025 07:26 UTC](https://discourse.nodered.org/t/energy-counter-reset/94961 "2025-01-30T07:26:55Z")

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Hi I'm trying to set-up a energy dashboard based on modbus-energy meters. My goal is to have the energy-consumption (kWh) displayed in the dashbaord and the possibility to reset this value to zero by pressing a button. …

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## [Unable to read serial data in Node red](https://discourse.nodered.org/t/unable-to-read-serial-data-in-node-red/94972)

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**Author:** [@Babu6727](https://discourse.nodered.org/u/Babu6727)\
**Replies:** 8\
**Last updated:** [30 January 2025 06:54 UTC](https://discourse.nodered.org/t/unable-to-read-serial-data-in-node-red/94972 "2025-01-30T06:54:40Z")

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I am getting data from the Modscan. but the same configuration is not working in Node-RED. need help on this situation Node-RED Version : V4.0.8 Device : CR800 wms data logger MOC: SerialR232 to USB

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## [Node-Red Error: spawn EINVAL](https://discourse.nodered.org/t/node-red-error-spawn-einval/94997)

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**Author:** [@Rupesh](https://discourse.nodered.org/u/Rupesh)\
**Replies:** 1\
**Last updated:** [30 January 2025 06:26 UTC](https://discourse.nodered.org/t/node-red-error-spawn-einval/94997 "2025-01-30T06:26:58Z")

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## [Help! USB serial port randomly disappeared for no apparent reason!](https://discourse.nodered.org/t/help-usb-serial-port-randomly-disappeared-for-no-apparent-reason/94975)

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**Author:** [@Roaders](https://discourse.nodered.org/u/Roaders)\
**Replies:** 4\
**Last updated:** [29 January 2025 19:02 UTC](https://discourse.nodered.org/t/help-usb-serial-port-randomly-disappeared-for-no-apparent-reason/94975 "2025-01-29T19:02:15Z")

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Hi All I have a raspberry pi running remotely that for over a year has been logging data received over a USB serial port. Node-red takes this data and passes it to a database. All of a sudden this has stopped working..…

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## [Allow CORS for UI Builder](https://discourse.nodered.org/t/allow-cors-for-ui-builder/94838)

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**Author:** [@cdacruz](https://discourse.nodered.org/u/cdacruz)\
**Replies:** 6\
**Last updated:** [29 January 2025 14:24 UTC](https://discourse.nodered.org/t/allow-cors-for-ui-builder/94838 "2025-01-29T14:24:51Z")

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Hi All, There is a way to allow CORS requests into UI Builder. I would like to share some json files through the UI Builder node... I don't find anything about that, only for the soket.io... I also try to activate CO…

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## [SNMP node new version outputs buffer, old version outputs string](https://discourse.nodered.org/t/snmp-node-new-version-outputs-buffer-old-version-outputs-string/94950)

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**Author:** [@Rgrove](https://discourse.nodered.org/u/Rgrove)\
**Replies:** 11\
**Last updated:** [29 January 2025 13:56 UTC](https://discourse.nodered.org/t/snmp-node-new-version-outputs-buffer-old-version-outputs-string/94950 "2025-01-29T13:56:36Z")

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I'm trying to offload some SNMP calls to a new install, and the SNMP flows on the new install are all completely broken. The flows are direct copy/paste from old machine to new one. New SNMP node version is 2.0.0 Old …

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## [Read multiple parameters w/ modbus flex getter](https://discourse.nodered.org/t/read-multiple-parameters-w-modbus-flex-getter/94976)

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**Author:** [@jakonnode](https://discourse.nodered.org/u/jakonnode)\
**Replies:** 2\
**Last updated:** [29 January 2025 12:53 UTC](https://discourse.nodered.org/t/read-multiple-parameters-w-modbus-flex-getter/94976 "2025-01-29T12:53:41Z")

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As per the below document, multiple parameters can be read using flex getter, but it reads only one/first address. Took cue from here. https://flows.nodered.org/flow/701452d1839b7e433e9eae171113ae35 Am I doing somethi…

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## [How to create a node to control neopixel leds one by one?](https://discourse.nodered.org/t/how-to-create-a-node-to-control-neopixel-leds-one-by-one/94978)

<div class="topic-metadata">

**Author:** [@doudou016](https://discourse.nodered.org/u/doudou016)\
**Replies:** 2\
**Last updated:** [29 January 2025 11:00 UTC](https://discourse.nodered.org/t/how-to-create-a-node-to-control-neopixel-leds-one-by-one/94978 "2025-01-29T11:00:08Z")

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Bonjour. je souhaiterais crée un nœud pour pouvoir allumer indépendamment une led ws2812b ( via gpio ou button ) sur une bande de 14 LED. J'utilise un nœud préconstruit ( https://raw.githubusercontent.com/RuiSantosdo…

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## [RPi2 "illegal instruction" even though nothing changed](https://discourse.nodered.org/t/rpi2-illegal-instruction-even-though-nothing-changed/94952)

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**Author:** [@derek](https://discourse.nodered.org/u/derek)\
**Replies:** 9\
**Last updated:** [29 January 2025 07:42 UTC](https://discourse.nodered.org/t/rpi2-illegal-instruction-even-though-nothing-changed/94952 "2025-01-29T07:42:21Z")

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Hello, first time posting here, can't believe "derek" wasn't taken. I set up node red on a Raspberry Pi 2 to act as an RFID reader, and everything worked perfectly fine for about a week. I had it set up so node red laun…

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## [Problem with SRF Node in Node-Red](https://discourse.nodered.org/t/problem-with-srf-node-in-node-red/94944)

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**Author:** [@ItalianSquirel](https://discourse.nodered.org/u/ItalianSquirel)\
**Replies:** 5\
**Last updated:** [28 January 2025 23:57 UTC](https://discourse.nodered.org/t/problem-with-srf-node-in-node-red/94944 "2025-01-28T23:57:51Z")

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I work as a researcher for the Alaska Center for Energy and Power (ACEP). I work very closely with a non-profit organization called Upward Bound and a big part of that non-profit work is getting students into Programm…

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