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@anroots
Created January 24, 2013 20:42
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Python script to blink two LED-s on/off from a Raspberry Pi
#!/usr/bin/env python
# Script for blinking two LED-s connected to a Raspberry Pi
#
# Author Ando Roots <ando@sqroot.eu>
# Created 24 Jan 2013
# Usage: run from CRON every 10 minutes
# Link http://sqroot.eu/2013/01/pi-hacking-1-my-intro-to-the-world-of-electronics
import RPi.GPIO as GPIO, time, datetime
# Setup
GPIO.setmode(GPIO.BCM)
GREEN_LED = 18
RED_LED = 23
GPIO.setup(GREEN_LED, GPIO.OUT)
GPIO.setup(RED_LED, GPIO.OUT)
# Time in ms between blinks
BLINK_DELAY = 0.4
# Temp vars for loop state
counter = 1
green_state = True
# How many blinks? 1 for every ten minutes of the current time (1 - 5 blinks)
times_to_blink = datetime.datetime.now().minute / 10
# Blink LED-s!
while counter <= times_to_blink:
print "Blink %d of %d!" % (counter, times_to_blink)
# Switch LED states
GPIO.output(GREEN_LED, green_state)
GPIO.output(RED_LED, not green_state)
# Save new states
green_state = not green_state
counter += 1
# Wait...
time.sleep(BLINK_DELAY)
print "Done!"
# Switch the LED-s off when done
GPIO.output(GREEN_LED, False)
GPIO.output(RED_LED, False)
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