# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=335

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

**Page:** 336

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## [I need to check if the PDF file has a specific text](https://discourse.nodered.org/t/i-need-to-check-if-the-pdf-file-has-a-specific-text/66486)

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**Author:** [@Eduardo1](https://discourse.nodered.org/u/Eduardo1)\
**Replies:** 6\
**Last updated:** [16 August 2022 12:18 UTC](https://discourse.nodered.org/t/i-need-to-check-if-the-pdf-file-has-a-specific-text/66486 "2022-08-16T12:18:00Z")

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Hi friends. I'm building an on-line market using telegram bots. I need to validate the proof of payment, all automatically. The idea is the following: the person will send the proof of payment in the form of a pdf in th…

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## [Src file custom template](https://discourse.nodered.org/t/src-file-custom-template/66481)

<div class="topic-metadata">

**Author:** [@joshuaC](https://discourse.nodered.org/u/joshuaC)\
**Replies:** 4\
**Last updated:** [16 August 2022 11:05 UTC](https://discourse.nodered.org/t/src-file-custom-template/66481 "2022-08-16T11:05:22Z")

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Hello, I have an http endpoint, with a template node that display some html/javascript/css. I would like to add a local css file and an image. Something like that : This seems like a simple thing to do but I cannot …

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## [Create a function with 2 outputs with condition](https://discourse.nodered.org/t/create-a-function-with-2-outputs-with-condition/66424)

<div class="topic-metadata">

**Author:** [@azertym](https://discourse.nodered.org/u/azertym)\
**Replies:** 22\
**Last updated:** [16 August 2022 10:50 UTC](https://discourse.nodered.org/t/create-a-function-with-2-outputs-with-condition/66424 "2022-08-16T10:50:26Z")

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Hi all, I want to make a function node with 2 conditions and so 2 output. This node need to check if 2 conditions are true. Conditions are : 70 values and SHORT are true go to msg 1 (output 1) else go to msg 2 (outpu…

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## [Global Object \> Influx DB](https://discourse.nodered.org/t/global-object-influx-db/66477)

<div class="topic-metadata">

**Author:** [@mynoderocks](https://discourse.nodered.org/u/mynoderocks)\
**Replies:** 3\
**Last updated:** [16 August 2022 10:41 UTC](https://discourse.nodered.org/t/global-object-influx-db/66477 "2022-08-16T10:41:33Z")

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Hi all, I was watching a youtube video where I saw parts of the code of a great idea I am trying to replicate. Idea: Values streaming from MQTT create a Global Object with the value(s) so something to this effect (fro…

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## [Reading data from database and sending to uibuilder](https://discourse.nodered.org/t/reading-data-from-database-and-sending-to-uibuilder/66432)

<div class="topic-metadata">

**Author:** [@miladmrm](https://discourse.nodered.org/u/miladmrm)\
**Replies:** 5\
**Last updated:** [16 August 2022 09:28 UTC](https://discourse.nodered.org/t/reading-data-from-database-and-sending-to-uibuilder/66432 "2022-08-16T09:28:25Z")

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I am developing a dashboard in uibuilder. Some of my data should be stored in the database and read from the database and displayed on the dashboard. I have no problem when storing data (I take the relevant output from u…

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## [Making it easier to work within a team with Nodered](https://discourse.nodered.org/t/making-it-easier-to-work-within-a-team-with-nodered/65860)

<div class="topic-metadata">

**Author:** [@miziagui](https://discourse.nodered.org/u/miziagui)\
**Replies:** 28\
**Last updated:** [16 August 2022 08:34 UTC](https://discourse.nodered.org/t/making-it-easier-to-work-within-a-team-with-nodered/65860 "2022-08-16T08:34:03Z")

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Hey everyone, We have been using NodeRed within a team of 4 people on financial systems for almost a year now and we recently greatly improved our ability to actually work without going crazy. So im here to share a few…

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## [Fan Speed Regulation PWM GPIO](https://discourse.nodered.org/t/fan-speed-regulation-pwm-gpio/66240)

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**Author:** [@Sleep](https://discourse.nodered.org/u/Sleep)\
**Replies:** 34\
**Last updated:** [16 August 2022 05:13 UTC](https://discourse.nodered.org/t/fan-speed-regulation-pwm-gpio/66240 "2022-08-16T05:13:12Z")

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Hi, I want to regulate the fan speed of my Noctua fans through PWM & GPIO. The fans are supplied by an external 12V power supply. I have tried to control the speed through a GPIO-out node and a slider sending a 0 - 10…

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## [Starlink Control](https://discourse.nodered.org/t/starlink-control/66464)

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**Author:** [@ceejm1](https://discourse.nodered.org/u/ceejm1)\
**Replies:** 0\
**Last updated:** [15 August 2022 20:48 UTC](https://discourse.nodered.org/t/starlink-control/66464 "2022-08-15T20:48:02Z")

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Hello, Looking to invoke the stow/unstow commands of a starlink dish without using the app. Come across this: which I think relates to this: Could anyone kindly suggest how these would work together to issue the …

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## [Blank Screen editor Chromium R\_Pi 3B](https://discourse.nodered.org/t/blank-screen-editor-chromium-r-pi-3b/66456)

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**Author:** [@Iqapps](https://discourse.nodered.org/u/Iqapps)\
**Replies:** 4\
**Last updated:** [15 August 2022 20:08 UTC](https://discourse.nodered.org/t/blank-screen-editor-chromium-r-pi-3b/66456 "2022-08-15T20:08:53Z")

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Hi! need advice about this issues....while upgraded to Node Red 3 (used script) and Pi system after that I getting blank page in browser. Node Red is running fine only problem is related to Chromium...Have read older to…

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## [Weird drop down question](https://discourse.nodered.org/t/weird-drop-down-question/66183)

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**Author:** [@9toejack](https://discourse.nodered.org/u/9toejack)\
**Replies:** 22\
**Last updated:** [15 August 2022 18:47 UTC](https://discourse.nodered.org/t/weird-drop-down-question/66183 "2022-08-15T18:47:51Z")

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Ok, so I have 3 sensor readings coming in, East Ferm, West Fermenter, Center Fermenter. I am using data to control the co2 supply for when i carbonating. however i have a 4thd valve that moves from one fermenter to ano…

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## [Fatal error on Docker after 3.0 upgrade](https://discourse.nodered.org/t/fatal-error-on-docker-after-3-0-upgrade/65543)

<div class="topic-metadata">

**Author:** [@TheLoudSteve](https://discourse.nodered.org/u/TheLoudSteve)\
**Replies:** 3\
**Last updated:** [15 August 2022 17:12 UTC](https://discourse.nodered.org/t/fatal-error-on-docker-after-3-0-upgrade/65543 "2022-08-15T17:12:14Z")

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After my docker image is updated to 3.0, I'm getting this error at container launch. I've been unable to determine where to start troubleshooting. # # Fatal error in , line 0 # unreachable code # # # #FailureMessage Obj…

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## [String to number convert](https://discourse.nodered.org/t/string-to-number-convert/66425)

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**Author:** [@Lorixx](https://discourse.nodered.org/u/Lorixx)\
**Replies:** 5\
**Last updated:** [15 August 2022 16:18 UTC](https://discourse.nodered.org/t/string-to-number-convert/66425 "2022-08-15T16:18:48Z")

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Hi I am currently trying to read the consumption of my washing machine. My problem I can not separate the string so far that I have only the numbers. I have already tried with split node but no solution found. can so…

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## [Usb camera- orange pi on - Node red](https://discourse.nodered.org/t/usb-camera-orange-pi-on-node-red/66414)

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**Author:** [@khucvietanh](https://discourse.nodered.org/u/khucvietanh)\
**Replies:** 2\
**Last updated:** [14 August 2022 22:08 UTC](https://discourse.nodered.org/t/usb-camera-orange-pi-on-node-red/66414 "2022-08-14T22:08:30Z")

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I have a project: And I don't know how to link orange pi one with a usb camera to node red Help me =((

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## [Telnet session with login](https://discourse.nodered.org/t/telnet-session-with-login/66442)

<div class="topic-metadata">

**Author:** [@novski](https://discourse.nodered.org/u/novski)\
**Replies:** 1\
**Last updated:** [15 August 2022 14:34 UTC](https://discourse.nodered.org/t/telnet-session-with-login/66442 "2022-08-15T14:34:58Z")

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I have a device that requires a Telnet Session with Login to communicate with it. The node-red-contrib-telnet-client does not provide session negotiation with Login. What opportunities do I have?

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## [Modbus tcp data type real](https://discourse.nodered.org/t/modbus-tcp-data-type-real/66400)

<div class="topic-metadata">

**Author:** [@Dalen98](https://discourse.nodered.org/u/Dalen98)\
**Replies:** 8\
**Last updated:** [15 August 2022 13:53 UTC](https://discourse.nodered.org/t/modbus-tcp-data-type-real/66400 "2022-08-15T13:53:34Z")

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Hello everyone, I was learning about the modbus nodes for node red and as you will see in the images if I can make a communication, I am working with a siemens s7 1200 plc up to there everything perfect, but that i…

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## [Gauge with pointer centred](https://discourse.nodered.org/t/gauge-with-pointer-centred/66375)

<div class="topic-metadata">

**Author:** [@JackHenry99](https://discourse.nodered.org/u/JackHenry99)\
**Replies:** 8\
**Last updated:** [14 August 2022 15:12 UTC](https://discourse.nodered.org/t/gauge-with-pointer-centred/66375 "2022-08-14T15:12:20Z")

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Hi I'm looking for a gauge that will display solar panel information as to whether I'm drawing from the grid or the panel. I want zero to be the centre. If drawing from the grid, the gauge should move anticlockwise and …

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## [Http request error](https://discourse.nodered.org/t/http-request-error/66438)

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**Author:** [@jdalama](https://discourse.nodered.org/u/jdalama)\
**Replies:** 1\
**Last updated:** [15 August 2022 11:39 UTC](https://discourse.nodered.org/t/http-request-error/66438 "2022-08-15T11:39:26Z")

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Hello. I have a problem with http requests, I am not able to make a request to my pc from a device (raspberry pi) to my PC where I have a Fiware platform running on docker. The error messages are the following: "no re…

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## [RAXDA zero, node-red-node-pi-gpio](https://discourse.nodered.org/t/raxda-zero-node-red-node-pi-gpio/66102)

<div class="topic-metadata">

**Author:** [@fabikm](https://discourse.nodered.org/u/fabikm)\
**Replies:** 2\
**Last updated:** [15 August 2022 08:44 UTC](https://discourse.nodered.org/t/raxda-zero-node-red-node-pi-gpio/66102 "2022-08-15T08:44:56Z")

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Does anyone have experience with GPIO use in PLC RADXDA zero hardware? The standard GPIO nodes for Raspberry pi understandably do not work. Raspberry pi is not available, Radxda can be bought, it even has higher comput…

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## [Store variables in files for use in flow?](https://discourse.nodered.org/t/store-variables-in-files-for-use-in-flow/66360)

<div class="topic-metadata">

**Author:** [@kitkat159](https://discourse.nodered.org/u/kitkat159)\
**Replies:** 5\
**Last updated:** [15 August 2022 08:41 UTC](https://discourse.nodered.org/t/store-variables-in-files-for-use-in-flow/66360 "2022-08-15T08:41:52Z")

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Hello everyone! I am currently working on a project where I want to store settings (e.g. "filter\_on = true") inside a textfile. I want to use these variables for later use in the flows, for example inside a switch-node. …

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## [How to store a msg.payload in a script variable inside a red ui\_template node?](https://discourse.nodered.org/t/how-to-store-a-msg-payload-in-a-script-variable-inside-a-red-ui-template-node/66429)

<div class="topic-metadata">

**Author:** [@fmino0312](https://discourse.nodered.org/u/fmino0312)\
**Replies:** 2\
**Last updated:** [15 August 2022 08:26 UTC](https://discourse.nodered.org/t/how-to-store-a-msg-payload-in-a-script-variable-inside-a-red-ui-template-node/66429 "2022-08-15T08:26:28Z")

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I wrote this code but it doesn't work \<script type = "text/javascript"\> var msg = {{msg.payload}} \</script\> this method considers the value {{msg.payload}} as an error due to the '{' in the syntax, I tr…

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## [Get bits from an integer](https://discourse.nodered.org/t/get-bits-from-an-integer/66277)

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**Author:** [@Ganesh](https://discourse.nodered.org/u/Ganesh)\
**Replies:** 11\
**Last updated:** [12 August 2022 10:11 UTC](https://discourse.nodered.org/t/get-bits-from-an-integer/66277 "2022-08-12T10:11:17Z")

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Hi I have an string of number Ex = 01001010 and I want to split it to 0,1,0,0,1,0 I am able to get that but it ignoring the zero in the at zero index I have attached flow below \[{"id":"60b50f5c.3a867","type":"debug","…

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## [Aquara Door Sensor](https://discourse.nodered.org/t/aquara-door-sensor/66381)

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**Author:** [@abreyen](https://discourse.nodered.org/u/abreyen)\
**Replies:** 8\
**Last updated:** [15 August 2022 00:51 UTC](https://discourse.nodered.org/t/aquara-door-sensor/66381 "2022-08-15T00:51:39Z")

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Hello! I recently purchased Aquara door sensors and their accompanying hub. Is there an easy way to get the sensors seen by Node Red to create a flow to notify if a door is left open? If this brand isn't particularly …

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## [How do I round a JavaScript number to 2 decimal places?](https://discourse.nodered.org/t/how-do-i-round-a-javascript-number-to-2-decimal-places/64571)

<div class="topic-metadata">

**Author:** [@ravi1987](https://discourse.nodered.org/u/ravi1987)\
**Replies:** 21\
**Last updated:** [14 August 2022 22:29 UTC](https://discourse.nodered.org/t/how-do-i-round-a-javascript-number-to-2-decimal-places/64571 "2022-08-14T22:29:30Z")

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36.99300003051758 I'm receiving this kind of value how can round of this

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## [Mongodb on RaspiOS64](https://discourse.nodered.org/t/mongodb-on-raspios64/66403)

<div class="topic-metadata">

**Author:** [@alexander77](https://discourse.nodered.org/u/alexander77)\
**Replies:** 11\
**Last updated:** [14 August 2022 22:00 UTC](https://discourse.nodered.org/t/mongodb-on-raspios64/66403 "2022-08-14T22:00:08Z")

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Hi, i tried to install mongodb on an raspi4 with 64bit Raspi-OS. The earlier used method does not work any longer, it comes up with: Fehlermeldung E: Für Paket »mongodb-server« existiert kein Installationskandidat. A…

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## [Dynamic loading of Flow/Tab from a remote location / repository like git](https://discourse.nodered.org/t/dynamic-loading-of-flow-tab-from-a-remote-location-repository-like-git/66194)

<div class="topic-metadata">

**Author:** [@mrSidX](https://discourse.nodered.org/u/mrSidX)\
**Replies:** 3\
**Last updated:** [14 August 2022 16:40 UTC](https://discourse.nodered.org/t/dynamic-loading-of-flow-tab-from-a-remote-location-repository-like-git/66194 "2022-08-14T16:40:24Z")

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I am curious if there is a practical way to have a node-red flow / tab of flows load up or refresh its contents based on a remote file location, like say a flow in a git repository, or url on the net? When Node-red star…

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## [Get data from a homepage](https://discourse.nodered.org/t/get-data-from-a-homepage/66421)

<div class="topic-metadata">

**Author:** [@vikozo](https://discourse.nodered.org/u/vikozo)\
**Replies:** 4\
**Last updated:** [14 August 2022 16:10 UTC](https://discourse.nodered.org/t/get-data-from-a-homepage/66421 "2022-08-14T16:10:34Z")

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Hello from i would like to collect the 3 altitude "Nullgradgrenze" so from the i have a html node and the Selektor is table.table\_simple heights-table i would expect some output but got just nothing - so what do …

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## [IoT systems testing\[Quick survey\]](https://discourse.nodered.org/t/iot-systems-testing-quick-survey/65199)

<div class="topic-metadata">

**Author:** [@baptiste2k8](https://discourse.nodered.org/u/baptiste2k8)\
**Replies:** 15\
**Last updated:** [14 August 2022 15:45 UTC](https://discourse.nodered.org/t/iot-systems-testing-quick-survey/65199 "2022-08-14T15:45:14Z")

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Dear Sir/Madam, We would like to hear your thoughts or feedback on how you test IoT systems! It will take you only 10 minutes maximum. This survey is conducted by a research team in software engineering from Concordia…

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## [Errors related to sqlite when migrating from docker image 2.2.2-16 to 3.0.2-16](https://discourse.nodered.org/t/errors-related-to-sqlite-when-migrating-from-docker-image-2-2-2-16-to-3-0-2-16/66367)

<div class="topic-metadata">

**Author:** [@janvda](https://discourse.nodered.org/u/janvda)\
**Replies:** 3\
**Last updated:** [14 August 2022 09:58 UTC](https://discourse.nodered.org/t/errors-related-to-sqlite-when-migrating-from-docker-image-2-2-2-16-to-3-0-2-16/66367 "2022-08-14T09:58:51Z")

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My dockerfile works fine when using image nodered/node-red:2.2.2-16 but when changing to nodered/node-red:3.0.2-16 the build failed. FYI successful build output when using image nodered/node-red:2.2.2-16: Step 3/16 : R…

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## [How do I access a string array and then convert to 2 separate numbers?](https://discourse.nodered.org/t/how-do-i-access-a-string-array-and-then-convert-to-2-separate-numbers/66393)

<div class="topic-metadata">

**Author:** [@questuk](https://discourse.nodered.org/u/questuk)\
**Replies:** 8\
**Last updated:** [14 August 2022 09:32 UTC](https://discourse.nodered.org/t/how-do-i-access-a-string-array-and-then-convert-to-2-separate-numbers/66393 "2022-08-14T09:32:05Z")

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Hi, I have tried for many hours to try and do this myself but it has eluded me :pensive: I am accessing my Sqlite database that is configured to store data as JSON. I have managed to get the data from that for Humidi…

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## [Noble BLE node not working after updating](https://discourse.nodered.org/t/noble-ble-node-not-working-after-updating/66397)

<div class="topic-metadata">

**Author:** [@kkuula](https://discourse.nodered.org/u/kkuula)\
**Replies:** 4\
**Last updated:** [14 August 2022 09:24 UTC](https://discourse.nodered.org/t/noble-ble-node-not-working-after-updating/66397 "2022-08-14T09:24:20Z")

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Hi, I updated node-red to newest version and Node Js to version 14 (been doing it for 6 hours now..) And finally I think I got most of the things working, but critical application is not working. I have sensors that I a…

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