# Latest

**URL:** https://discourse.nodered.org/latest.md?page=998

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

**Page:** 999

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## [Sending buffers to Serial Port Node - Error](https://discourse.nodered.org/t/sending-buffers-to-serial-port-node-error/32967)

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**Author:** [@DaveDave](https://discourse.nodered.org/u/DaveDave)\
**Replies:** 6\
**Last updated:** [16 September 2020 21:15 UTC](https://discourse.nodered.org/t/sending-buffers-to-serial-port-node-error/32967 "2020-09-16T21:15:16Z")

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Hi, I've been working on this for a while now with no success, so it's time to ask for some help. I'm using Node-Red on a RPI with node-red-node-serialport to communicate with a serial device that accepts ASCII command…

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## [Light control button and slider](https://discourse.nodered.org/t/light-control-button-and-slider/32313)

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**Author:** [@JeroenKokhuis](https://discourse.nodered.org/u/JeroenKokhuis)\
**Replies:** 12\
**Last updated:** [16 September 2020 21:00 UTC](https://discourse.nodered.org/t/light-control-button-and-slider/32313 "2020-09-16T21:00:03Z")

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Hello, I have a button to control the light. The button is a template. Now I want to add a slider to the same template but I've tried many sliders, wiich I found in the forum, but none of them works. This is the flo…

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## [Different volume when casting](https://discourse.nodered.org/t/different-volume-when-casting/32971)

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**Author:** [@cvandingelen](https://discourse.nodered.org/u/cvandingelen)\
**Replies:** 4\
**Last updated:** [16 September 2020 19:33 UTC](https://discourse.nodered.org/t/different-volume-when-casting/32971 "2020-09-16T19:33:36Z")

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Hi everyone As a morning routine, I have some text I cast (with the cast node) to my speakers. Now I would like the cast volume to be different at different times. To be specific, when it's before 9am or after 10pm, th…

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## [Git commit author in Project mode with external authentication](https://discourse.nodered.org/t/git-commit-author-in-project-mode-with-external-authentication/32972)

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**Author:** [@BorisDaich](https://discourse.nodered.org/u/BorisDaich)\
**Replies:** 1\
**Last updated:** [16 September 2020 18:24 UTC](https://discourse.nodered.org/t/git-commit-author-in-project-mode-with-external-authentication/32972 "2020-09-16T18:24:20Z")

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Hi This is my first post so I would like to use this opportunity to express gratitude to the developers and to the community! Current Setup: We run node-red on a server with multiple users that create and edit flows f…

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## [During delay drop all intermediate messages?](https://discourse.nodered.org/t/during-delay-drop-all-intermediate-messages/32965)

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**Author:** [@Zerg](https://discourse.nodered.org/u/Zerg)\
**Replies:** 1\
**Last updated:** [16 September 2020 18:16 UTC](https://discourse.nodered.org/t/during-delay-drop-all-intermediate-messages/32965 "2020-09-16T18:16:22Z")

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Could you advise me? I need that if an message is "ON" comes, then within 11 seconds all other messages will be ignored! I tried to implement delay using the node "delay" but, this node is randomly counting the seconds,…

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## [Possible Bug Related to Groups](https://discourse.nodered.org/t/possible-bug-related-to-groups/32966)

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**Author:** [@dudleyjosh](https://discourse.nodered.org/u/dudleyjosh)\
**Replies:** 1\
**Last updated:** [16 September 2020 18:06 UTC](https://discourse.nodered.org/t/possible-bug-related-to-groups/32966 "2020-09-16T18:06:53Z")

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I've found that if I copy & paste a node within a group, it locks up the Node-RED UI. I'm using the latest version of Chrome on macOS... has any one else experienced this? I get the following in the console if I copy a…

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## [Alarm siren latch and switch off after a predetermined time](https://discourse.nodered.org/t/alarm-siren-latch-and-switch-off-after-a-predetermined-time/32933)

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**Author:** [@Stevef](https://discourse.nodered.org/u/Stevef)\
**Replies:** 8\
**Last updated:** [16 September 2020 17:55 UTC](https://discourse.nodered.org/t/alarm-siren-latch-and-switch-off-after-a-predetermined-time/32933 "2020-09-16T17:55:48Z")

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I am a total newby..I have built a Raspberry pi with sensors that ,when they are triggered, even momentary, I want to sound an alarm siren for a set time, say 5min, and then reset and read the sensor state again. The ala…

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## [Smooth Node - Getting Mean/Avg from sensors](https://discourse.nodered.org/t/smooth-node-getting-mean-avg-from-sensors/32963)

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**Author:** [@phreaq](https://discourse.nodered.org/u/phreaq)\
**Replies:** 2\
**Last updated:** [16 September 2020 17:54 UTC](https://discourse.nodered.org/t/smooth-node-getting-mean-avg-from-sensors/32963 "2020-09-16T17:54:31Z")

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I have several temperature/humidity sensors, and I'm currently using the 'smooth' node to determine the mean/avg values for all the sensors. However, I am unsure about the 'over the most recent x values' option, and i…

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## [Sunrise/sunset casting](https://discourse.nodered.org/t/sunrise-sunset-casting/32890)

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**Author:** [@cvandingelen](https://discourse.nodered.org/u/cvandingelen)\
**Replies:** 8\
**Last updated:** [16 September 2020 17:35 UTC](https://discourse.nodered.org/t/sunrise-sunset-casting/32890 "2020-09-16T17:35:24Z")

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Hi I'm new at Node Red, and now (in Home Assistant Node Red), I want to cast when the sun will rise and set. I found this api https://api.sunrise-sunset.org. When I put the output in a debug node I get the correct outp…

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## [Emotiv with Emotiv Toolbox and node-red](https://discourse.nodered.org/t/emotiv-with-emotiv-toolbox-and-node-red/17839)

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**Author:** [@rafaelonos](https://discourse.nodered.org/u/rafaelonos)\
**Replies:** 11\
**Last updated:** [16 September 2020 17:32 UTC](https://discourse.nodered.org/t/emotiv-with-emotiv-toolbox-and-node-red/17839 "2020-09-16T17:32:08Z")

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Hello everyone! I'm developing this project who consists in control an robotic arm using the Emotiv EPOC+. I found a toolbox here (https://flows.nodered.org/node/node-red-contrib-emotiv-bci) but it doesn't connect to the…

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## [Reconnect TCP Request Node](https://discourse.nodered.org/t/reconnect-tcp-request-node/32919)

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**Author:** [@dudleyjosh](https://discourse.nodered.org/u/dudleyjosh)\
**Replies:** 4\
**Last updated:** [16 September 2020 17:02 UTC](https://discourse.nodered.org/t/reconnect-tcp-request-node/32919 "2020-09-16T17:02:26Z")

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Is there a way to force reconnect a TCP Request node from a flow? I can use a Status node to monitor if the TCP Request node is connected... but I can't seem to find a way to force reconnect if needed?

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## [Function Node for Beginner](https://discourse.nodered.org/t/function-node-for-beginner/32948)

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**Author:** [@Philip](https://discourse.nodered.org/u/Philip)\
**Replies:** 17\
**Last updated:** [16 September 2020 15:59 UTC](https://discourse.nodered.org/t/function-node-for-beginner/32948 "2020-09-16T15:59:17Z")

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Hi Guys I'm a total beginner to Node-Red with no programming experience.....I am looking to connect a DHT11 Temp Humidity Sensor with an Uno (Done) and represent on Two Graphs Node Red /ui. I am stuck with the Java code…

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## [Saving variable inside a nodes property](https://discourse.nodered.org/t/saving-variable-inside-a-nodes-property/32955)

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**Author:** [@entrisity](https://discourse.nodered.org/u/entrisity)\
**Replies:** 3\
**Last updated:** [16 September 2020 14:30 UTC](https://discourse.nodered.org/t/saving-variable-inside-a-nodes-property/32955 "2020-09-16T14:30:23Z")

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Hey, Lets say i want to be able to change a property inside a node like the gauge. How would i do it and how could i modify that variable inside a function?

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## [Receive from Andoid/iOS push alerts/notifications](https://discourse.nodered.org/t/receive-from-andoid-ios-push-alerts-notifications/14834)

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**Author:** [@Romprod](https://discourse.nodered.org/u/Romprod)\
**Replies:** 4\
**Last updated:** [16 September 2020 13:18 UTC](https://discourse.nodered.org/t/receive-from-andoid-ios-push-alerts-notifications/14834 "2020-09-16T13:18:41Z")

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Hi, Is it possible to receive alerts from either Android or iOS somehow? I can't see any nodes that will do that (tbh I don't even know where to start with this one! :smile: )

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## [Lookup closest matching value of array and return array index number](https://discourse.nodered.org/t/lookup-closest-matching-value-of-array-and-return-array-index-number/32927)

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**Author:** [@Zodiac-69](https://discourse.nodered.org/u/Zodiac-69)\
**Replies:** 3\
**Last updated:** [16 September 2020 12:19 UTC](https://discourse.nodered.org/t/lookup-closest-matching-value-of-array-and-return-array-index-number/32927 "2020-09-16T12:19:13Z")

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Hi All I have a payload 0 to 5 in non-linear fractions. i have a "look up" array\[16\] How do i do the following? Find the value in the array that closest match the payload. Return the index position of this value.

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## [Dashboard crashing on different browsers](https://discourse.nodered.org/t/dashboard-crashing-on-different-browsers/32666)

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**Author:** [@TheRiddler](https://discourse.nodered.org/u/TheRiddler)\
**Replies:** 22\
**Last updated:** [16 September 2020 11:11 UTC](https://discourse.nodered.org/t/dashboard-crashing-on-different-browsers/32666 "2020-09-16T11:11:33Z")

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I am running a dashboard that periodically examines my aircon system with its different sensors and my solar inverter to measure generation and consumption. It also pings my network on a regular basis to measure internal…

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## [Displaying data from csv to dashboard table](https://discourse.nodered.org/t/displaying-data-from-csv-to-dashboard-table/32951)

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**Author:** [@Gromilicious](https://discourse.nodered.org/u/Gromilicious)\
**Replies:** 0\
**Last updated:** [16 September 2020 09:49 UTC](https://discourse.nodered.org/t/displaying-data-from-csv-to-dashboard-table/32951 "2020-09-16T09:49:56Z")

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Hey all, I'm new to node red and wanted to display data from 3 columns in a csv file to a dashboard ui table and am having alot of trouble actually filling the table with the data. \[{"id":"1378ba83.90c825","type":"tab"…

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## [Behavior of websocket handleServerUpgrade](https://discourse.nodered.org/t/behavior-of-websocket-handleserverupgrade/32934)

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**Author:** [@nileio](https://discourse.nodered.org/u/nileio)\
**Replies:** 5\
**Last updated:** [16 September 2020 10:08 UTC](https://discourse.nodered.org/t/behavior-of-websocket-handleserverupgrade/32934 "2020-09-16T10:08:19Z")

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Hi all, I am building a new node and was learning about the way the core websocket nodes are built. I created a websocket listener for some test paths, examples /test1 and /test2 I used them for testing and then I de…

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## [How to queue / hold the sensor values ,when there is a internet failure occurs](https://discourse.nodered.org/t/how-to-queue-hold-the-sensor-values-when-there-is-a-internet-failure-occurs/32608)

<div class="topic-metadata">

**Author:** [@Energycharges](https://discourse.nodered.org/u/Energycharges)\
**Replies:** 16\
**Last updated:** [14 September 2020 06:15 UTC](https://discourse.nodered.org/t/how-to-queue-hold-the-sensor-values-when-there-is-a-internet-failure-occurs/32608 "2020-09-14T06:15:02Z")

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Hi All, Am trying to send my sensor data from raspberry node red to mongo atlas cloud db , am losing the datas when internet failure occurs . am using the 4g data for the internet . can anyone give a solution to h…

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## [Node-RED SQLITE stores Data Base on windows](https://discourse.nodered.org/t/node-red-sqlite-stores-data-base-on-windows/1438)

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**Author:** [@kharlos04](https://discourse.nodered.org/u/kharlos04)\
**Replies:** 13\
**Last updated:** [16 September 2020 07:04 UTC](https://discourse.nodered.org/t/node-red-sqlite-stores-data-base-on-windows/1438 "2020-09-16T07:04:03Z")

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Hi there ! I wanna store the temperature measurement and the time when the measurement was done; actually works fine on my flow (I've a UI to display the table, I made it using dashboard), the problem is I don't know wh…

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## [Help with function, checking a value](https://discourse.nodered.org/t/help-with-function-checking-a-value/32938)

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**Author:** [@BassTeQ](https://discourse.nodered.org/u/BassTeQ)\
**Replies:** 3\
**Last updated:** [16 September 2020 08:01 UTC](https://discourse.nodered.org/t/help-with-function-checking-a-value/32938 "2020-09-16T08:01:44Z")

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Hello, I'm having trouble trying to work out why this logic isn't going into the last condition if (status == "true") { appreciate any help var status = msg.payload.on; // // used to skip the startup event var transitio…

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## [Web Page Authentication](https://discourse.nodered.org/t/web-page-authentication/32945)

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**Author:** [@Devbrat](https://discourse.nodered.org/u/Devbrat)\
**Replies:** 1\
**Last updated:** [16 September 2020 07:46 UTC](https://discourse.nodered.org/t/web-page-authentication/32945 "2020-09-16T07:46:50Z")

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Hi All, I am trying to implement authentication in my web page created in my node. Created below get API based in node to work only if user has logged-in in node-red or opening from the link which is availatble on conf…

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## [Pendrive/SD card file copy](https://discourse.nodered.org/t/pendrive-sd-card-file-copy/32829)

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**Author:** [@nygma2004](https://discourse.nodered.org/u/nygma2004)\
**Replies:** 21\
**Last updated:** [16 September 2020 07:25 UTC](https://discourse.nodered.org/t/pendrive-sd-card-file-copy/32829 "2020-09-16T07:25:35Z")

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Hi All, I would like my node-red flow to copy some files to a pendrive or an SD card as soon as I plug it into the raspberry pi. I understand that this is more of a linux question how to detect a new device and mount th…

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## [Bacnet read problem](https://discourse.nodered.org/t/bacnet-read-problem/32941)

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**Author:** [@pm.integrator](https://discourse.nodered.org/u/pm.integrator)\
**Replies:** 0\
**Last updated:** [16 September 2020 05:32 UTC](https://discourse.nodered.org/t/bacnet-read-problem/32941 "2020-09-16T05:32:12Z")

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\<Hello everyone, in my project I am using the bacnet read node, I did some tests and it works perfectly, the problem is that to get the data I am forced to use an inject node with the "repeat" function, considering tha…

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## [Help Function for multi line chart](https://discourse.nodered.org/t/help-function-for-multi-line-chart/32298)

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**Author:** [@Cristiano](https://discourse.nodered.org/u/Cristiano)\
**Replies:** 2\
**Last updated:** [16 September 2020 00:31 UTC](https://discourse.nodered.org/t/help-function-for-multi-line-chart/32298 "2020-09-16T00:31:58Z")

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Hello, Im trying to get data from influx and put in multi line chart, the problem is if i get a huge array i got error or if i inject the message using the node i get error. Error: function : (error) TypeError: Canno…

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## [Time to start on dashboard](https://discourse.nodered.org/t/time-to-start-on-dashboard/32721)

<div class="topic-metadata">

**Author:** [@lalo](https://discourse.nodered.org/u/lalo)\
**Replies:** 13\
**Last updated:** [15 September 2020 21:13 UTC](https://discourse.nodered.org/t/time-to-start-on-dashboard/32721 "2020-09-15T21:13:11Z")

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Hi, I'm trying to create like a timer from the dashabord so the user select the hout to start, and I'm having troubles to create the object. I will paste my flow here. \[{"id":"78b0667e.628df8","type":"tab","label":"Irr…

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## [\[solved\] Cannot install/use npm in Ubuntu 16.04 LTS](https://discourse.nodered.org/t/solved-cannot-install-use-npm-in-ubuntu-16-04-lts/32925)

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**Author:** [@loeten](https://discourse.nodered.org/u/loeten)\
**Replies:** 6\
**Last updated:** [15 September 2020 20:28 UTC](https://discourse.nodered.org/t/solved-cannot-install-use-npm-in-ubuntu-16-04-lts/32925 "2020-09-15T20:28:48Z")

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Dear all, on an older laptop, used for a lot of things, I would like to use node-red. I tried so many things and at least I see: $ node -v v14.10.1 npm -v 6.14.8 but I had some warnings also,and I cannot install no…

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## [Read Telegram Group](https://discourse.nodered.org/t/read-telegram-group/32816)

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**Author:** [@Fiveat](https://discourse.nodered.org/u/Fiveat)\
**Replies:** 6\
**Last updated:** [15 September 2020 20:13 UTC](https://discourse.nodered.org/t/read-telegram-group/32816 "2020-09-15T20:13:34Z")

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Hello team, I'd like to know if could be possible read a telegram group (I'm not the owner, just a viewer) and resend this text to another group where I'm the Owner. Thanks in advance and kind regards,

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## [Parse CSV and Skip lines starting with #](https://discourse.nodered.org/t/parse-csv-and-skip-lines-starting-with/32923)

<div class="topic-metadata">

**Author:** [@Meistro](https://discourse.nodered.org/u/Meistro)\
**Replies:** 4\
**Last updated:** [15 September 2020 20:10 UTC](https://discourse.nodered.org/t/parse-csv-and-skip-lines-starting-with/32923 "2020-09-15T20:10:14Z")

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Hello all, I want to use this data without editing the source file. The quantity of lines at the start of the file with # varies so I can't easily just skip the first so many lines. # RaceRender Data: TrackAddict 4.4.2…

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## [Does sqlite node build a queue?](https://discourse.nodered.org/t/does-sqlite-node-build-a-queue/32910)

<div class="topic-metadata">

**Author:** [@r0ller](https://discourse.nodered.org/u/r0ller)\
**Replies:** 5\
**Last updated:** [15 September 2020 20:04 UTC](https://discourse.nodered.org/t/does-sqlite-node-build-a-queue/32910 "2020-09-15T20:04:03Z")

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Hi All, Just a simple question to which I could not find the answer in the help of the node: does the sqlite node build a queue of the incoming requests? As there may be multiple concurrent listeners of the same sqlite …

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