programming a servo thru a barometer

Question

i have a script which gets the air pressure from a website  and i wrote this function  which says if the pressure gets different value if it rains or sunny weather or else   now i have a servo which should change the angle depending on each value  Well i now that my servo goes from 0 to 360 degree  But how can I correspond my 360 Degree values to the air pressure value   def barometer wert     if wert  lt   1000       print  ES REGNET BALD     if wert  gt 1000 and wert  lt  1040      print  WETTER VERAENDERLICH     if wert  gt 1040 and wert  lt  1060      print barometer wert  or       Lets say   if air pressure value   1000  vector value   10  in Degrees  Should i go to a list    Or is there a easier solution   thanks for help   Chris

User · Accepted Answer

You could define a mapping of air pressure to servo angle, for example:

def calc_angle(pressure, min_p=1000, max_p=1200):     return 360 * ((pressure - min_p) / float(max_p - min_p))  angle = calc_angle(pressure)

This will linearly convert pressure values between min_p and max_p to angles between 0 and 360 (you could include min_a and max_a to constrain the angle, too).

To pick a data structure, I wouldn't use a list but you could look up values in a dictionary:

d = {1000:0, 1001: 1.8, ...}  angle = d[pressure]

but this would be rather time-consuming to type out!

[python] programming a servo thru a barometer

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