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from __future__ import print_function
from math import pi

#Acme rod specs
pitch = 2 #millimeters
numStarts = 4
lead = numStarts*pitch/10.0 #cm

#Syringe specs
syringeDiameter = 26.7 #millimeters
syringeArea = pi*(syringeDiameter/10.0)**2/4.0 #cm^2

#Motor specs
microSteps = 16
stepsPerRev = 200
numSteps = stepsPerRev*microSteps#200 steps with 1/8 microstepping
resolution = lead*syringeArea/numSteps #mL\n"

print (u"{:0.3f} \u03bcL resolution".format(resolution*1000))


    

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def computeRewardTime(desiredVolume): #desired volume in mL
    volumePerStep = resolution #mL
    msPerStep = 2 #ms
    stepsNeeded = desiredVolume/volumePerStep #steps
    return round(stepsNeeded*msPerStep,2)