Event Listeners do not work (PiFace 2) with Python3

Have you tried Python 2 as well?

Clem

Hi Clem,

It appears to be exactly the same. No errors but listeners just don't trigger.

I tried my own program, the sample from the pifacedigitalio documentation and a variety of other interrupts programs that I found on Google.

Very frustrating

Mark

Can you post code to see if there may be any apparent problem?

Hi Clem,

One of the examples I tried.....I also typed in the example on the pifacedigitalio docs page.

Mark

from time import sleep

import pifacedigitalio

DELAY = 0.5  # seconds

pfd = pifacedigitalio.PiFaceDigital() # creates a PiFace Digtal object

def switch_pressed(event):

    print "Hello"

    pfd.leds[0].value = 1

def switch_unpressed(event):

    print "Bebop"

    pfd.leds.leds[1].value = 1

listener = pifacedigitalio.InputEventListener(chip=pfd)

for i in range(4):

    listener.register(i, pifacedigitalio.IODIR_ON, switch_pressed)

    listener.register(i, pifacedigitalio.IODIR_OFF, switch_unpressed)

listener.activate()

try:

    while True:     #check program is still running by flashing led 3

        pfd.leds[2].toggle()     # toggle third LED

        sleep(DELAY)

except KeyboardInterrupt:

    print "Closing Down....Ctrl+C"

    listener.deactivate()

from time import sleep
import pifacedigitalio
pifacedigital = pifacedigitalio.PiFaceDigital()
PushOver('Doorbell','Started','')
print 'Doorbell Server Started\r'

listener = pifacedigitalio.InputEventListener(chip=pifacedigital)
listener.register(1, pifacedigitalio.IODIR_OFF, door_open)
listener.register(1, pifacedigitalio.IODIR_ON, door_closed)
listener.register(4, pifacedigitalio.IODIR_ON, switch_pressed)
listener.register(4, pifacedigitalio.IODIR_OFF, switch_unpressed)
listener.activate()
while True:
    sleep(3600)    # or any very long time
def door_open(event):
    print "Hello"
    pfd.leds[0].value = 1
  
def door_closed(event):
    print "Bebop"
    pfd.leds[0].value = 0
def switch_pressed(event):
    print "Hello2"
    pfd.leds[1].value = 1
  
def switch_unpressed(event):
    print "Bebop2"
    pfd.leds[1].value = 0

Try this please,

Clem

Hi Clem,

Cut and pasted your example and tried it. Same as before in that the events did not trigger.

One odd thing though is that the code needed modified to work. I assume it was for python2 given the statements but I had to move the function definitions above the listener statements to get it to compile. Is that what you would have expected ?

I'm using the python 2 (or 3) that comes setup when you log in to the pi from the NOOB's SD card.

Mark

Sorry I misplaced them. I am left to conclude there is hardware issue underlying the problem(s).

clem

Hi Clem,

I noticed while trawling Google that others have experienced this too. I suspect that there is some software update that has disabled it.

I've ordered an Arduino for my project as at least there will be no ambiguity about what is currently running. Not a great solution but it might actually prove easier for my son to do as he was really struggling with all the ancillary stuff you need to know to use Raspbian.

Thanks for your help.

Regards

Mark

Please look through this: http://www.element14.com/community/message/133136/l/piface-digital-2--setup-and-use#133136

Maybe a setup step was missed...

Clem

Has anyone found a resolution to this problem yet?

I had some code working fine earlier in the year but now it no longer works.

The listener just does not seem to be activated.

The piface works well using a while loop but I really want to use the listener for my project.

I have been through and reinstalled everything as per the docs above but no luck.

I code snippet given above does not work for me either.

Really hope someone can help with this.

Cheers

Phil