The trimmer potentiometers are used to adjust the high and low thresholds for the pressure sensor circuit. The adjustment needs to read between 0 and 33 rather than the ADC result of 0 and 1023, so the slope intercept formula is a good formula to use in this case.
y = mx + b
f(x) = y or f(x) = mx + b
f(0) = 0
f(1023) = 33
m = rise / run = ?y/?x
= (0 - 33) / (0 - 1023)
= -33 / -1023
= 0.0323
To find b (plug in x and y values, the easiest values in this case would be 0,0):
y = mx + b
0 = 0.0323(0) + b
0 = 0 + b
b = 0
So the formula is:
y = 0.0323(x)
where
x = ADC value
and
y = the value to be displayed on the LCD
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