pyElectrometer

import serial
import platform
import glob
import time

filename = "Electrometer " + str(int(time.time())) + ".txt"

print "617 Programmable Electrometer Reader"
print "(C) 2016 Daniel Centore"
print ""
print "Instructions (Windows):"
print " * Find the Arduino COM port using device manager"
print " * Type the COM port in below (ex COM6)"
print ""
print "Instructions (Linux)"
print " * Find the Arduino port by using ls in /dev/"
print " * Type the full port name below (ex /dev/ttyACM4)"
print ""
print "Instructions (All)"
print " * File data will appear in the file \"" + filename + "\""
print " * Press Ctrl+C to quit data collection"
print ""

port = raw_input("Pick a port: ")
ser = serial.Serial(port, 9600)

# Discard the early data
millis = int(round(time.time() * 1000))
newMillis = int(round(time.time() * 1000))
while newMillis < millis + 200:
    ser.readline()
    newMillis = int(round(time.time() * 1000))

f = open(filename, "w");

while True:
    dataPoint = ser.readline()
    try:
        data = float(dataPoint)

        # Do whatever you want with the data point here
        f.write(str(data) + "\n")
        print data

    except ValueError:
        print "BAD_DATA"