cylon.py - Pulse an LED bar like a Cylon - Raspberry Pi

cylon.py

#
# Pulse an LED bar like a Cylon
#
# This is my Raspberry Pi "Hello World".
#

import RPi.GPIO as GPIO
import time


# blinking function
def blink(pin):
    GPIO.output(pin,GPIO.HIGH)
    time.sleep(0.05)
    GPIO.output(pin,GPIO.LOW)

try:
    # to use Raspberry Pi board pin numbers
    GPIO.setmode(GPIO.BOARD)  

    # set up GPIO pins
    pins = [35, 37, 7, 11, 13, 15, 19, 21, 23, 29]
    for pin in pins:
        GPIO.setup(pin, GPIO.OUT)
        GPIO.output(pin,GPIO.LOW)

    # build reversed list
    rev_pins = pins[::-1]
    del rev_pins[-1]
    del rev_pins[0]

    # Cylon time!
    while True:
        for pin in pins:
            blink(pin)
        for pin in rev_pins:
            blink(pin)

finally:
    GPIO.cleanup()