Hi, I am outputting accelerometer data at high freq. (119 Hz) to Node-RED dashboard via line chart node. I realized when we have lower freq. (1 Hz) there are no issues, but at higher frequencies, the dashboard can't catch up with the data as shown in below image. [dashboardNode-RED] I can see via…

I think you will need dedicated hardware to capture at that data rate, your graph example would contain over 14000 data points, if they could all be displayed. Also, node red is single threaded and there are lots of other processes and interrupts happening in the background.

How are you drawing the chart - which node are you using (or html?). Some charts are more efficient than others, because when a new point is added, some libraries reload and redraw the entire chart, which maybe is struggling to keep up.

Forgive my ignorance about the topic, but I would like mention something. Node-RED is running on Pi that runs minimal dietpi image, so it is CLI only. I access to Pi via SSH from my Intel i7 laptop. I realized Node-RED runs smoother than when I access it on Pi itself. So, I have assumed that it dep…

Hi @Paul-Reed , Here is the example setup: [exampleSetup] Here is the configuration of line chart node: [linechartConfig] I need to visualize these based on the time. I also changed X-axis setting to minutes as well, I have not observed any differences based on the performance. It works well, …

[image] hkayan: I realized Node-RED runs smoother than when I access it on Pi itself. It may well be the browser that is overloading the machine running it, or possibly the connection between the two systems is the limiting factor, rather than node-red itself.

Hi @Colin , Any advice regarding what might be the best setup to display such high freq. data?

Many things depend on the charting library. The chart node for dashboard uses the angular-chart.js which is based on Chart.js v2.xx Chart.js is common charting library so it is not optimized to be performance king. But there is some advises to get more out of it. Performance | Chart.js . I think mos…

Hi @hotNipi , Thanks for this informative post. Can you elaborate the below statement please? So may be you can get better results if using some library which does claim to be fast. For example the uPlot How can I use/integrate such a library to Node-RED dashboard?

Here is one example [image] u-Plot charts simple live data example Dashboard You'll need to download the needed files from here GitHub - leeoniya/uPlot: chart_with_upwards_trend A small, fast chart for time series, lines, areas, ohlc & bars and then serve them from your …

Oh, I understand now what you mean. We download from GitHub, than include via: <script src="/uplot/uPlot.iife.min.js"></script> using the template node. Just one more question, if my path is /home/pi/uplot/uPlot.iife.min.js is this how should include: <script src="/home/pi/uplot/uPlot.iife.min.j…

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Node-RED dashboard can't handle high freq. data

Dashboard

hotNipi 25 November 2021 17:17 12

Here is one example

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Node-RED dashboard can't handle high freq. data

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