On 26/10/14 22:42, Bill Bright wrote:
Thanks to all for the help. The code below seems to work. My question is
why does oldstates need to be multiplied by 32?
Its creating 32 instances of True. So you can cater for up to 32
different switch positions.
will only read 32 switch changes? That would be a problem.
No it can manage up to 32 different switches. Each switch can toggle
between True/False as often as it likes but oldstates will store the
previous state for each switch.
oldstates=[True]*32
def changed(channel):
newstate = GPIO.input(channel)
change = oldstates[channel] and not newstate
oldstates[channel] = newstate
Here is where it compares the old and new state of the given switch/channel
while True:
if changed(23):
os.system('mpg321 -g 95 a.mp3')
if changed(24):
os.system('mpg321 -g 95 b.mp3')
if changed(25):
os.system('mpg321 -g 95 c.mp3')
sleep(1.1);
HTH
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos
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