i know, read again my post, i talk about
lines between old points and new points
or more easy rectangles for the new points!
but add you must get the background cleaned up too.
add not forget some more jobs i mentioned already,
make header text , realtime value and unit
like you see in my greenish graph picture above
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how about change the 2000 and 500 msec delay in arduino?
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and think about a complete new design:
store the records to array, min long for ONE DAY
and do not a running graph instead a real user (time) scalable
line graph