Changing your screen's brightness from the data in a serial port

gistfile1.py

import serial, time, os
ser = serial.Serial('/dev/ttyACM0', 9600)
while 1:
    time.sleep(0.05)
    try:
        line = ser.readline().strip()
        value = int(line) * 10
        command = 'echo "{0}" > /sys/class/backlight/intel_backlight/brightness'.format(value)
        os.system(command)
        print(command)
    except serial.serialutil.SerialException:
        print "Error reading from serial"
    except OSError:
        print "Error reading from serial"
    except ValueError:
        value = 300