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import thread # the usual suspects of imports |
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from time import sleep |
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import RPi.GPIO as GPIO |
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import pygame.mixer |
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import random |
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from sys import exit |
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pygame.mixer.init(44100, -16, 1, 1024) # set up the mixer |
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announceAudio = pygame.mixer.Sound("seats-1.wav") # initially give announceAudio a value |
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soundChannelA = pygame.mixer.Channel(1) # initialize a mixer channel |
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soundChannelB = pygame.mixer.Channel(2) # initialize another mixer channel – we'll need 2 |
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GPIO.setmode(GPIO.BCM) |
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GPIO.setwarnings(False) |
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GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # configure GPIO 23 for pushbutton in |
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GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # configure GPIO 24 for pushbutton in |
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GPIO.setup(25, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # configure GPIO 25 for pushbutton in |
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GPIO.setup(18, GPIO.OUT) # configure GPIO 18 for a simple LED output |
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def do_play_music(): # this will be the thread that will start music playback |
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pygame.mixer.music.play(1) # play music as background |
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pygame.mixer.music.set_volume(0.4) # set music sound to low volume |
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sleep(3) |
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def music_callback(channel): # this is the callback function for the music playback |
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if GPIO.input(23): |
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music = ["auditorium-break-1.wav","auditorium-break-2.wav","auditorium-break-3.wav"] |
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random.shuffle(music,random.random) # randomly shuffle up the three music files |
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pygame.mixer.music.load(music[0]) # uses the pygame music function which streams the music |
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thread.start_new_thread(do_play_music, ()) # calls the music start thread |
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GPIO.remove_event_detect(23) # resets the GPIO event detect |
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GPIO.add_event_detect(23, GPIO.RISING, callback=music_callback, bouncetime=300) |
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sleep(1) # the above line re-initializes the event detect |
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def do_announce(): # the announcement thread routine |
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soundChannelA.play(announceAudio) # play the announcement |
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def announce_callback(channel): # this is the announcement callback |
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if GPIO.input(24): |
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global announceAudio # had to make this variable global so that it could be passed |
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seatsAudio = ["seats-1.wav","seats-2.wav","seats-3.wav"] # to the thread routine |
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random.shuffle(seatsAudio,random.random) # randomize the announce files |
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announceAudio = pygame.mixer.Sound(seatsAudio[0]) # assign the variable to be passed to the thread |
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thread.start_new_thread(do_announce, ()) # start the playback thread |
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GPIO.remove_event_detect(24) # reset the GPIO detect and reinitialize on next line |
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GPIO.add_event_detect(24, GPIO.RISING, callback=announce_callback, bouncetime=200) |
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sleep(1) |
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def do_fadeout(): # the fadeout thread |
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pygame.mixer.fadeout(5000) # fade out any announcement going on |
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pygame.mixer.music.fadeout(5000) # fade out background music |
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def fade_callback(channel): # the fadeout callback routine |
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if GPIO.input(25): |
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thread.start_new_thread(do_fadeout, ()) # start the fadeout thread |
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GPIO.remove_event_detect(25) # reset the GPIO detect and reinitialize it on the next line |
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GPIO.add_event_detect(25, GPIO.RISING, callback=fade_callback, bouncetime=200) |
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sleep(1) |
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GPIO.add_event_detect(23, GPIO.RISING, callback=music_callback, bouncetime=300) # these three lines set up the |
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GPIO.add_event_detect(24, GPIO.RISING, callback=announce_callback, bouncetime=300) # event detects for the first time |
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GPIO.add_event_detect(25, GPIO.RISING, callback=fade_callback, bouncetime=200) # and assign which callback is |
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# associated with which button |
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while True: # this is the main program loop – which is just that |
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try: # an endless loop that keep things going. |
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GPIO.output(18, True) # turn on the LED to show that the program is running. |
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if pygame.mixer.get_busy(): # if at any time an announcement is going on the music channel is lowered |
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pygame.mixer.music.set_volume(0.15) # lower the music volume while the announcer is on |
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else: # when the announcement is no longer happening – the music vol goes back up |
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pygame.mixer.music.set_volume(0.4) # raise the music volume back up after announcement is done |
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except KeyboardInterrupt: |
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GPIO.cleanup() |
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exit() |
