christmas_lights.py

#!/usr/bin/env python
import serial
import random
from time import sleep

wait = 0.1

sp = serial.Serial(port='/dev/ttyACM0', baudrate=9600, timeout=2, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)

def clean_buffer(sp):
  if sp.inWaiting() > 0: sp.read(sp.inWaiting())

while True:
  r = random.random()
  if r > 0.9:
    continue
  else:
    b = random.randint(1, 3) - 1
    v = random.randint(1, 9)
  u = [0, 0, 0]
  u[b] = v

  r = random.random()
  if ( r > 0.8 ):
    b = random.randint(1, 3) - 1
    u[b] = v

  str = b"%d%d%d." % tuple(u)
  sp.write(str)
#  sleep(wait)
#  sp.write(b'.')
  sleep(wait)