arduino_datalog_plot.py

# plot voltages captured by arduino ADC (AnalogReadSerial example)
# capture data with RealTerm 3.0
# use custom timestamp format: yyyy-mm-dd hh:nn:ss.zzz

import pandas as pd

df = pd.read_csv('capture.txt', names=['t','v'], parse_dates=['t'])
df['v'] = df['v'] / 1023 * 5
df['ms'] = (df['t'] - df['t'][0]).astype('timedelta64[ms]')
df.plot('ms','v')