My fun little script that I built for an introduction to programming on the raspberry pi with a breadboard. Hook up a blue and red LED and connect them to the translating channels in the script and watch your breadboard turn into a cop car!

Cops.py

# Made by Kai Aldag on September 30, 2015

# Imports
import RPi.GPIO as GPIO
import sys
import time

# Setup

GPIO.setmode(GPIO.BOARD)

blue_chan = 11 # Channel specific to my project, change these values
red_chan = 13 # same as above

GPIO.setup([blue_chan, red_chan], GPIO.OUT)
GPIO.output([blue_chan, red_chan], 0)

# Application

should_run = True
current = "Blue"

try:
	interval = int(sys.argv[1])
except IndexError:
	interval = 0.5
except ValueError:
	interval = 0.5

while should_run:
  if current == "Blue":
    GPIO.output(blue_chan, 1)
    GPIO.output(red_chan, 0)
    current = "Red"
  else:
    GPIO.output(red_chan, 1)
    GPIO.output(blue_chan, 0)
    current = "Blue"
  time.sleep(interval)
  
GPIO.cleanup()