July 12, 2018
I am collecting sensor data that I am plotting to Thingspeak.
A particular sensor gives me 0 or 1 depending on the status of an electrical relay.
I am recording the time when the relay turns ON (value 1). Then I want confirmation that the relay turned OFF (value 0). This is expected to happen twice a day, every day.
Although I am keen to record / display the data to ensure the relay goes ON and OFF when it needs to, I am trying to minimise the data plotted as I have more than one sensor, and the website where I display the plots struggles due to the number of points.
I am aware of the min / max function that allows to eliminate "bad" data, but I need to see both 0 and 1 in my case, so this isn't an option unfortunately. I also cannot use the average function since I wouldn't know if I could have missed a "relay=ON" event.
Is there an easy way to only plot points that are different from one time iteration (t) to the next (t+1)? This would minimise significantly the number of points I want to display.
I am already using all the fields possible in my channel, so I don't think I can do a calculation in Matlab to then write onto a new field.
If removing duplicates is not an option, do you have any other suggestions?
Many thanks in advance.
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