add little bit industrial engineering view:
lets say your arduino with 10bit AD
gives 0 … 1023 ( that are also steps / resolution. )
if that would be your PLC Progammable Logic Controller
and not only collect data, also does something with it ( like PID control )
it internally would work with converting 1023 to 100.0 float %
a PLC would never know that that value means 200 … 1400 Gallons/squarefoot
( would be heavy raining HA? )
if a Visualization is required ( like your PC running Processing )
linked by USB … ethernet modbus fieldbus
to the PLC (Arduino)
the data transport also would be in 1023 or 100.0 range
( but actually connected with a measuring point code /
the 1023,1023,1023 CSV line is easy and fast, but easly gives mistakes
only the Visualization knows the real TAG name “temperature”
but even that is confusing ?inside?outside?.. industrial naming like
“TR 14-09” temperatur recorder area 14 measurement 9
added a description “Temp vessel V14-02 top”
and the required low and high range
( 0 … 1023 ) means 0 … 100 ? what ?
yes add you need a UNIT
“deg C”
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i hoped that helped little bit,
mostly to understand why you need to change that line in your Arduino code
int waarde1 = pressure;
int waarde2 = h;
int waarde3 = t;