+- OpenMarine (https://forum.openmarine.net)
+-- Forum: OpenPlotter (https://forum.openmarine.net/forumdisplay.php?fid=1)
+--- Forum: General discussion (https://forum.openmarine.net/forumdisplay.php?fid=2)
+--- Thread: sampling frequency (/showthread.php?tid=2112)
sampling frequency - sailwing - 2019-11-27
Hi,
I am using setting up Node-Red in openplotter to get feed from SignalK and from the 1W DS18B20 sensor, as well as a voltage sensor through MCP3008. I wanted to plot the reading history for the last 24 hours. However I found that there were too many data points. How do I set the sampling or poll frequency in this case? I searched around SignalK setting did not find anything.
Thank you in advance.
RE: sampling frequency - Sailoog - 2019-11-27
Have you considered using influxdb and chronograph/grafana for reading history? in SK-influxdb plugin you can set that frecuency you need.
Install openplotter-dashboards app in openplotter 2
RE: sampling frequency - jim321 - 2019-11-27
https://flows.nodered.org/node/node-red-contrib-ds18b20-sensor
https://flows.nodered.org/node/node-red-node-pi-mcp3008
RE: sampling frequency - sailwing - 2019-11-27
(2019-11-27, 12:20 PM)Sailoog Wrote: Have you considered using influxdb and chronograph/grafana for reading history? in SK-influxdb plugin you can set that frecuency you need.
Install openplotter-dashboards app in openplotter 2
I have not tried that, I will give it a try...thank you.
(2019-11-27, 12:20 PM)jim321 Wrote: https://flows.nodered.org/node/node-red-contrib-ds18b20-sensor
https://flows.nodered.org/node/node-red-node-pi-mcp3008
thank you. are you suggesting to use "timestamp" as a way to control the frequency?