[Tutor] Python GPIO Code Help Needed
I have been working on a piece of code that I got from another tutorial. The
code polls the GPIO pins on a Raspberry Pi. When it detects a switch being
flipped, it plays a corresponding audio file. My problem is, if the switch
remains flipped, the audio repeats again and again. What I would like to do is
when a switch is flipped have the audio play, then have the code pause until
the switch is returned to normal (not repeating the audio), and then return to
the while loop to poll for the next switch flip. I am apparently not smart
enough to figure out the correct code. I really need some help with this and I
would appreciate any assistance.
Here is the code I'm working with.
#!/usr/bin/env python
from time import sleep
import os
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.IN)
GPIO.setup(24, GPIO.IN)
GPIO.setup(25, GPIO.IN)
while True:
if ( GPIO.input(23) == False ):
os.system('mpg321 -g 95 a.mp3')
if ( GPIO.input(24) == False ):
os.system('mpg321 -g 95 b.mp3')
if ( GPIO.input(25)== False ):
os.system('mpg321 -g 95 c.mp3')
sleep(1.1);
___
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Re: [Tutor] Python GPIO Code Help Needed
Thanks to everyone for the help. The code below seems to work. My question is
why does oldstates need to multiplied by 32? Does this mean that the code will
only work for 32 switches before I have to reset the Pi?
Code:
#!/usr/bin/env python
from time import sleep
import os
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.IN)
GPIO.setup(24, GPIO.IN)
GPIO.setup(25, GPIO.IN)
oldstates=[True]*32
def changed(channel):
newstate = GPIO.input(channel)
change = oldstates[channel] and not newstate
oldstates[channel] = newstate
return change
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);___
Tutor maillist - Tutor@python.org
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[Tutor] Python GPIO Code Help Needed
Thanks to all for the help. The code below seems to work. My question is why
does oldstates need to be multiplied by 32? Does this means the code will only
read 32 switch changes? That would be a problem.
Code:
#!/usr/bin/env python
from time import sleep
import os
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.IN)
GPIO.setup(24, GPIO.IN)
GPIO.setup(25, GPIO.IN)
oldstates=[True]*32
def changed(channel):
newstate = GPIO.input(channel)
change = oldstates[channel] and not newstate
oldstates[channel] = newstate
return change
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);___
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