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I have real time data from a weather station that I need to plot. I have made wavewcharts of the the data and it plots on 2 min interval (the sampling interval of the incoming port) then I would like to have plots with 7 days of data on them. past 7 days basically. I have manged to set the realtime date and time on the x-scale but I can not get it to display more than 2 hours at a time. If I set the x scale max and min, it seems not to update the graph correctly.
I have tried to set that to 604800 (number of seconds in a week) but it still seems to only do 2 hours, but I have not let it run for that long to really see what it does so I will try to set it like that and see what happens.
Unless you're useing the waveform data type, the reason why you're
probably running into some issues is because waveform charts are not
time based, they are sample based.
As in, unless you're explicitly including timing information (either
through an x-scale multiplier, and an equal time delay in your data
gathering loop, or via the waveform data type), it will simply plot the
number of datapoints it receives as the x-axis.
If you were already accounting for this, I apologize
You said you're plotting once every 2 minutes. I assume this means that you're wiring a value into the chart only once every 2 minutes. This is important because charts calculate the time based on the starting time (offset) and the difference between each 2 points (multiplier).
So:
Make sure you're only wiring a value into the chart once every 2 minutes (has to be constant).
Set the offset property to the current time when you start (use Get Date\Time in Seconds and then To DBL to convert to a numeric).
