# General **URL:** https://discourse.nodered.org/c/general/7.md?page=294 [Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md) **Page:** 295 --- ## [Where to find which nodes were installed](https://discourse.nodered.org/t/where-to-find-which-nodes-were-installed/70459)
**Author:** [@warnert](https://discourse.nodered.org/u/warnert)\ **Replies:** 3\ **Last updated:** [13 November 2022 20:14 UTC](https://discourse.nodered.org/t/where-to-find-which-nodes-were-installed/70459 "2022-11-13T20:14:42Z")
My pi with node-red and the rest won't boot anymore after a powerfail. I have a backup of my config but that comes with a lot of errors. Missing nodes. Some are quite easy to find out what node it was (mysql) but other… --- ## [Arduino node installed but get error when deploy?](https://discourse.nodered.org/t/arduino-node-installed-but-get-error-when-deploy/70513)
**Author:** [@Eskolin](https://discourse.nodered.org/u/Eskolin)\ **Replies:** 7\ **Last updated:** [13 November 2022 19:33 UTC](https://discourse.nodered.org/t/arduino-node-installed-but-get-error-when-deploy/70513 "2022-11-13T19:33:36Z")
Hi alll I have a problem when I deploy my flow, I am using arduino running firmata firmware and it has running fine when I usede a RPI but I am now using a Unbunto PC, all other nodes there is no problem when I deploy. … --- ## [Help with filtering payload](https://discourse.nodered.org/t/help-with-filtering-payload/70518)
**Author:** [@hugovsky](https://discourse.nodered.org/u/hugovsky)\ **Replies:** 6\ **Last updated:** [13 November 2022 13:53 UTC](https://discourse.nodered.org/t/help-with-filtering-payload/70518 "2022-11-13T13:53:18Z")
I'm using node-red-contrib-sun-position to control my roller blinders. I need to pass blinder position to the node if I use the manual commands. To do this, I'm using this example flow to: 1- get current position but on… --- ## [Serialport node does not work](https://discourse.nodered.org/t/serialport-node-does-not-work/70535)
**Author:** [@Atari](https://discourse.nodered.org/u/Atari)\ **Replies:** 2\ **Last updated:** [13 November 2022 13:38 UTC](https://discourse.nodered.org/t/serialport-node-does-not-work/70535 "2022-11-13T13:38:55Z")
Hi Everyone, I am a beginner at raspberry Pi and Node Red. A year ago I was able to get a raspberry pi with Node red working to control my television over rs232 commands. I useds the serialport node for this and a usb … --- ## [Buttons and output state](https://discourse.nodered.org/t/buttons-and-output-state/70534)
**Author:** [@Erich](https://discourse.nodered.org/u/Erich)\ **Replies:** 3\ **Last updated:** [13 November 2022 12:53 UTC](https://discourse.nodered.org/t/buttons-and-output-state/70534 "2022-11-13T12:53:09Z")
Good evening I have 9 similar flows for lamps. Each has one UI button and one or more Sonoff buttons. This works fine. I have add a alarm button who sets all outputs on. I would memorize the Powerstatus for the 9 outp… --- ## [Can't Access Weather Underground](https://discourse.nodered.org/t/cant-access-weather-underground/69919)
**Author:** [@hengy77](https://discourse.nodered.org/u/hengy77)\ **Replies:** 4\ **Last updated:** [13 November 2022 11:11 UTC](https://discourse.nodered.org/t/cant-access-weather-underground/69919 "2022-11-13T11:11:13Z")
I think my API Key is good, however I keep getting this error when trying to access WU on my Magic mirror running Node Red You don't have permission to access "http://api.weather.com/v2/pws/observations/current?" on thi… --- ## [Removing nag screen on 1st launch](https://discourse.nodered.org/t/removing-nag-screen-on-1st-launch/70530)
**Author:** [@greengolfer](https://discourse.nodered.org/u/greengolfer)\ **Replies:** 1\ **Last updated:** [13 November 2022 10:36 UTC](https://discourse.nodered.org/t/removing-nag-screen-on-1st-launch/70530 "2022-11-13T10:36:32Z")
Hello, For my app, I am creating a specific docker container with a set of predefined flows. After each deployment or upgrade of the container, I get a nag screen "Welcome to nodered"... Is there a way to disable this? … --- ## [Sending UART command to barcode scanner](https://discourse.nodered.org/t/sending-uart-command-to-barcode-scanner/70441)
**Author:** [@fkristofb](https://discourse.nodered.org/u/fkristofb)\ **Replies:** 5\ **Last updated:** [13 November 2022 08:20 UTC](https://discourse.nodered.org/t/sending-uart-command-to-barcode-scanner/70441 "2022-11-13T08:20:43Z")
Hi all, I am working on a Raspberry PI and am trying to find a way so that when the end user presses a button a command is executed for the module and and it starts to scan. It is a Waveshare barcode scanner module. … --- ## [How do I unsecure the node red admin and dashboard?](https://discourse.nodered.org/t/how-do-i-unsecure-the-node-red-admin-and-dashboard/70520)
**Author:** [@emlarsen](https://discourse.nodered.org/u/emlarsen)\ **Replies:** 3\ **Last updated:** [13 November 2022 07:12 UTC](https://discourse.nodered.org/t/how-do-i-unsecure-the-node-red-admin-and-dashboard/70520 "2022-11-13T07:12:23Z")
I did an apt-get update/upgrade on my pi 3b OpenHABian system and now node red admin and dashboard ask for a sign in “http://OpenHABian:1880 requires a username and password. Your connection to this site is not secure.” … --- ## [Blank Window when i start up Node Red](https://discourse.nodered.org/t/blank-window-when-i-start-up-node-red/70517)
**Author:** [@marccasas](https://discourse.nodered.org/u/marccasas)\ **Replies:** 1\ **Last updated:** [13 November 2022 07:10 UTC](https://discourse.nodered.org/t/blank-window-when-i-start-up-node-red/70517 "2022-11-13T07:10:27Z")
When i start up Node Red, only appears just a blank windows, even though i've re installed Node.Js and Node Red, why could be tha cause??? --- ## [How to scrape a specific information from a web page that loads after X seconds?](https://discourse.nodered.org/t/how-to-scrape-a-specific-information-from-a-web-page-that-loads-after-x-seconds/70519)
**Author:** [@boo](https://discourse.nodered.org/u/boo)\ **Replies:** 0\ **Last updated:** [12 November 2022 23:56 UTC](https://discourse.nodered.org/t/how-to-scrape-a-specific-information-from-a-web-page-that-loads-after-x-seconds/70519 "2022-11-12T23:56:18Z")
Hi, I would like to scrape a piece of information from the below url https://pastedownload.com/mdisk-video-downloader/#url=https://mdisk.me/convertor/640x321/FEaMGW which gives the download link after few seconds...how… --- ## [Using a variable within an influxDB node](https://discourse.nodered.org/t/using-a-variable-within-an-influxdb-node/70474)
**Author:** [@itcouldbeL](https://discourse.nodered.org/u/itcouldbeL)\ **Replies:** 7\ **Last updated:** [12 November 2022 21:20 UTC](https://discourse.nodered.org/t/using-a-variable-within-an-influxdb-node/70474 "2022-11-12T21:20:57Z")
Hi again, I'm trying to build a simple flow which will ping a set of IP addresses and send an alert if there is a failed ping. Part of my flow will check influxdb but I need the 'measurement' to be variable. in the scre… --- ## [Node to use with Smart Card readers and apply APDU protocol](https://discourse.nodered.org/t/node-to-use-with-smart-card-readers-and-apply-apdu-protocol/70291)
**Author:** [@JorgeGomes](https://discourse.nodered.org/u/JorgeGomes)\ **Replies:** 11\ **Last updated:** [12 November 2022 21:11 UTC](https://discourse.nodered.org/t/node-to-use-with-smart-card-readers-and-apply-apdu-protocol/70291 "2022-11-12T21:11:14Z")
Hello all, I'm new with Node red, and I've realized that it is a powerful tool with a huge capability, I'm looking for some nodes to use with Smart cards and also with APDU communication protocol. Do you know some that… --- ## [How to I allow my variable to be used and have my Arduino execute automatically?](https://discourse.nodered.org/t/how-to-i-allow-my-variable-to-be-used-and-have-my-arduino-execute-automatically/70514)
**Author:** [@Ceowens](https://discourse.nodered.org/u/Ceowens)\ **Replies:** 1\ **Last updated:** [12 November 2022 20:53 UTC](https://discourse.nodered.org/t/how-to-i-allow-my-variable-to-be-used-and-have-my-arduino-execute-automatically/70514 "2022-11-12T20:53:06Z")
I calculated an updating theta value on my Raspberry Pi, I'm sending that over to another Raspberry Pi because of the distance my project requires via MQTT, and what I want to do is to be able to send that variable over … --- ## [Install script node\ fails](https://discourse.nodered.org/t/install-script-node-version-fails/70431)
**Author:** [@bakman2](https://discourse.nodered.org/u/bakman2)\ **Replies:** 17\ **Last updated:** [12 November 2022 20:27 UTC](https://discourse.nodered.org/t/install-script-node-version-fails/70431 "2022-11-12T20:27:52Z")
I had installed a new server with nodejs, happened to be node 19.x, so I figured if I install NR with the --node16 option, it would uninstall v19 and install v16, but the install script states: This can take 20-30 minut… --- ## [Odd Behavior with HTTP node since upgrade](https://discourse.nodered.org/t/odd-behavior-with-http-node-since-upgrade/70512)
**Author:** [@davidmarch](https://discourse.nodered.org/u/davidmarch)\ **Replies:** 0\ **Last updated:** [12 November 2022 20:12 UTC](https://discourse.nodered.org/t/odd-behavior-with-http-node-since-upgrade/70512 "2022-11-12T20:12:20Z")
I have been using the a flow that takes address information from our CRM and sends it to a weather site (weatherbit.io) and retrieves the weather information. It has always worked fine until I upgraded. I was passing the… --- ## [Weird Happenings with Gmail. Can't figure it out](https://discourse.nodered.org/t/weird-happenings-with-gmail-cant-figure-it-out/70509)
**Author:** [@davidmarch](https://discourse.nodered.org/u/davidmarch)\ **Replies:** 0\ **Last updated:** [12 November 2022 20:04 UTC](https://discourse.nodered.org/t/weird-happenings-with-gmail-cant-figure-it-out/70509 "2022-11-12T20:04:30Z")
Thanks for providing the information regarding how to configure google account now that google doesn't allow for less secure apps. I decided to use a google account that I have for business that holds our youtube account… --- ## [How do I separate and define two of my variables?](https://discourse.nodered.org/t/how-do-i-separate-and-define-two-of-my-variables/70503)
**Author:** [@Ceowens](https://discourse.nodered.org/u/Ceowens)\ **Replies:** 2\ **Last updated:** [12 November 2022 18:56 UTC](https://discourse.nodered.org/t/how-do-i-separate-and-define-two-of-my-variables/70503 "2022-11-12T18:56:35Z")
I have code that is outputting an x value, a y value, a max value, a radius value, and a theta value within my Raspberry Pi that updates every second. An example output looks like this below: Highest Number: 31.9029 x:… --- ## [Trap receiver to digital output](https://discourse.nodered.org/t/trap-receiver-to-digital-output/70506)
**Author:** [@Gabi](https://discourse.nodered.org/u/Gabi)\ **Replies:** 0\ **Last updated:** [12 November 2022 18:54 UTC](https://discourse.nodered.org/t/trap-receiver-to-digital-output/70506 "2022-11-12T18:54:10Z")
Hi everyone, I need to trigger 2 digital outputs by SNMP traps, so seems like node-red is the best solution The main issue is that I cannot handle what oid to send, so I need to use function or switch in order to selec… --- ## [Node-red merging multiple tasks](https://discourse.nodered.org/t/node-red-merging-multiple-tasks/70308)
**Author:** [@cano](https://discourse.nodered.org/u/cano)\ **Replies:** 29\ **Last updated:** [12 November 2022 09:51 UTC](https://discourse.nodered.org/t/node-red-merging-multiple-tasks/70308 "2022-11-12T09:51:23Z")
Hello, I will have 3 buttons on node-red and in a yaml file I will create from visual studio, which button I press will trigger the task in that button, how can I do it? --- ## [Status sensor minus of](https://discourse.nodered.org/t/status-sensor-minus-of/70455)
**Author:** [@manustars](https://discourse.nodered.org/u/manustars)\ **Replies:** 5\ **Last updated:** [12 November 2022 11:48 UTC](https://discourse.nodered.org/t/status-sensor-minus-of/70455 "2022-11-12T11:48:07Z")
I know it's trivial, but I can't. I would like to create a flow that sends me a message on telegram and a voice message on google home (for google invoking the tts service of HA) when an ha sensor drops below 20%. the no… --- ## [Using environment variable during another environment variable definiton in flow properties - issue](https://discourse.nodered.org/t/using-environment-variable-during-another-environment-variable-definiton-in-flow-properties-issue/70316)
**Author:** [@jopl](https://discourse.nodered.org/u/jopl)\ **Replies:** 11\ **Last updated:** [12 November 2022 11:25 UTC](https://discourse.nodered.org/t/using-environment-variable-during-another-environment-variable-definiton-in-flow-properties-issue/70316 "2022-11-12T11:25:04Z")
Dear all NodeRed enthusiastics, I notified I am not able to use environment variable in another environment variable definition in flow properties similar to example shown above. I don't know why, but the first variable… --- ## [Can node property dialog use data from config node property?](https://discourse.nodered.org/t/can-node-property-dialog-use-data-from-config-node-property/69588)
**Author:** [@Joe-AB1DO](https://discourse.nodered.org/u/Joe-AB1DO)\ **Replies:** 34\ **Last updated:** [12 November 2022 00:14 UTC](https://discourse.nodered.org/t/can-node-property-dialog-use-data-from-config-node-property/69588 "2022-11-12T00:14:41Z")
Hi All, Let me preface this by saying that I am not a programmer, but know enough to be dangerous. Also I am using a RPi4 running NR 3.0 and Node.js 16.17 OK here goes: I am trying to modify an i2c port expander node … --- ## [POST JSON Object via HTTP REQUEST](https://discourse.nodered.org/t/post-json-object-via-http-request/70425)
**Author:** [@interscope101](https://discourse.nodered.org/u/interscope101)\ **Replies:** 4\ **Last updated:** [12 November 2022 00:12 UTC](https://discourse.nodered.org/t/post-json-object-via-http-request/70425 "2022-11-12T00:12:45Z")
Hello, I've been running a node-red app that sent a string URL via an HTTP REQUEST (that also included a SHA 256 encoded signature in the headers). Now I needed to send a request that had some nested parameters (array),… --- ## [Refresh tab page on opening](https://discourse.nodered.org/t/refresh-tab-page-on-opening/70451)
**Author:** [@andro](https://discourse.nodered.org/u/andro)\ **Replies:** 7\ **Last updated:** [12 November 2022 00:03 UTC](https://discourse.nodered.org/t/refresh-tab-page-on-opening/70451 "2022-11-12T00:03:39Z")
Newbie here. I have a Javascript/CSS clock that I wrote that works great. It takes an injected message every one second to update the time. All is good but of course there is a delay of up to one second when you open tha… --- ## [Converting JSON input for use in the Filemaker Server API](https://discourse.nodered.org/t/converting-json-input-for-use-in-the-filemaker-server-api/70473)
**Author:** [@deninger](https://discourse.nodered.org/u/deninger)\ **Replies:** 1\ **Last updated:** [11 November 2022 23:41 UTC](https://discourse.nodered.org/t/converting-json-input-for-use-in-the-filemaker-server-api/70473 "2022-11-11T23:41:11Z")
I have set up a node to receive api data from a system. It comes in JSON format: { "ID": "1234567890", "Event":"Test Node-Red", "Context":"1234567-00" } When it appears in Node-Red, it shows up as a string wit… --- ## [Flow.get function adds data to the flow context instead of just reading it](https://discourse.nodered.org/t/flow-get-function-adds-data-to-the-flow-context-instead-of-just-reading-it/70460)
**Author:** [@Martin12](https://discourse.nodered.org/u/Martin12)\ **Replies:** 4\ **Last updated:** [11 November 2022 20:17 UTC](https://discourse.nodered.org/t/flow-get-function-adds-data-to-the-flow-context-instead-of-just-reading-it/70460 "2022-11-11T20:17:22Z")
Hello everyone, I have some strange behaviour with the flow.get function. This function changes the context data, although I actually only want to read it out. Is it intended to do so? Is there a way that the context da… --- ## [OwnTracks send request position](https://discourse.nodered.org/t/owntracks-send-request-position/70447)
**Author:** [@Giamma](https://discourse.nodered.org/u/Giamma)\ **Replies:** 1\ **Last updated:** [11 November 2022 14:48 UTC](https://discourse.nodered.org/t/owntracks-send-request-position/70447 "2022-11-11T14:48:07Z")
Hi, yesterday I installed Owntracks to send position from mobile to my pc with node red \> Worldmap. There are 4 mode on mobile how to send the position but I don't need this option, I'd like to have the opportunity to … --- ## [Compare time now against time as a varible](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435)
**Author:** [@gazzaman22](https://discourse.nodered.org/u/gazzaman22)\ **Replies:** 15\ **Last updated:** [11 November 2022 14:34 UTC](https://discourse.nodered.org/t/compare-time-now-against-time-as-a-varible/70435 "2022-11-11T14:34:34Z")
Hi all im trying to compare 2 times and calculate the difference, one is from a trigger and the other is a pre-set time , I found how to check the times and get the time difference but i can work how to have a set time … --- ## [Reliable reading multiple ds18b20’s with a raspberry pi without flow stalls](https://discourse.nodered.org/t/reliable-reading-multiple-ds18b20-s-with-a-raspberry-pi-without-flow-stalls/70433)
**Author:** [@torrdan](https://discourse.nodered.org/u/torrdan)\ **Replies:** 4\ **Last updated:** [11 November 2022 11:30 UTC](https://discourse.nodered.org/t/reliable-reading-multiple-ds18b20-s-with-a-raspberry-pi-without-flow-stalls/70433 "2022-11-11T11:30:20Z")
Hi all, I have the following setup: 4 digital temperature sensors DS18b20 which are physically wired in a parallel configuration (sensors are connected one after the other in a line) with CAT5 wires to the GPIO4 of the… [Previous page](https://discourse.nodered.org/c/general/7.md?page=293) [Next page](https://discourse.nodered.org/c/general/7.md?page=295)