NUM_OF_SAMPLES = 1000

import serial

s = serial.Serial(port="/dev/ttyACM0")
def read():
    data = []
    for i in range(NUM_OF_SAMPLES):
        line = s.readline().rstrip().decode("ascii")
        if line != "":
            #line format is e.g. "measured: 4111"
            data.append(int(line.split(":")[1]))
    return data

data_untouched = read()

data_touched = read()
s.close()

plot(data_untouched) #blue
plot(data_touched)   #green

min(data_untouched) - max(data_touched[300:-1])