Upon pressing the start button, I'm sending measurements via MQTT. When I press the stop button, I want to have the option to either append a CSV file with the data series or discard the data in case of faulty measurements. The start button initiates processes, while the stop button halts them and s…

That is the path i used in testing on my machine, you would edit it to the path of the folder where your files are, i presume /csv_files/. Maybe you could look at links provided to get some answers.

Of course there are lots of ways to do this. Personally I would shy away from storing the data within Node-red for fear of running out of memory. Instead I would write the data to file and later on choose to save or delete it: Use a context variable to hold a filename. Value set by the start button…

[image] jbudd: Of course there are lots of ways to do this. Personally I would shy away from storing the data within Node-red for fear of running out of memory. Instead I would write the data to file and later on choose to save or delete it: Use a context variable to hold a filename. Value set …

[image] Asiayqyyq: my question is as follows: How can I save files to an SD card in Node-RED with the filename being the current date? You can use JSONata and $moment() in the file write node path input to append/create a date to the file name. [image] New name for every pi…

[image] E1cid: You can use JSONata and $moment() in the file write node path input to append/create a date to the file name. Is it possible to create a window in the dashboard for working with these files, primarily for deletion?

Many ways to possible do this. You could use the exex node to read the directory and then create a drop down that lists the files. You could then select the file and show a notification to confirm delete. Then reread the directory to refresh the drop down. e.g. [{"id":"34616e52c802c16f","type":"u…

[image] E1cid: Będziesz musiał edytować ścieżkę w węźle exec i następnym węźle zmiany. The path where I have the files is in such a directory /csv_files/. How should I correctly enter it into the exec node?

is that absolute path or relative? Where is it in relation to .node-red folder?

[image] E1cid: Where is it in relation to .node-red folder? The files are located on the SD card of the Raspberry Pi.

[image] E1cid: is that absolute path or relative? This is the path I provided when saving in the 'write' node. It looks like an absolute path.

I am not a pi user. I think you would have to mount the sd card, if ls /csv_files/ is not absolute path. or this may work instead of exec node [edit] Try cd / | ls /csv_files/

Node-RED

Node-RED Forum

Append or Discard Data Series on Stop Button Press

General

E1cid 7 September 2023 11:50 4

You can use JSONata and $moment() in the file write node path input to append/create a date to the file name.

Topic		Replies	Views
Download a file using a button - connection lost Dashboard	17	7282	4 October 2018
Create/append file on dashboard General	8	3388	11 April 2020
Downloading csv file generated by MySQL database after pressing a form button General	30	3322	21 August 2020
Deleting and Creating New Data Files General	11	2627	21 July 2020
Store msg alone without needing to have excel ,SQLite table just by topic to payload it again to node red when needed General	39	1348	7 August 2021

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Append or Discard Data Series on Stop Button Press

Related topics