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Groups > comp.lang.python > #92858

Re: Keypress Input

Date 2015-06-18 16:42 -0600
From Michael Torrie <torriem@gmail.com>
Subject Re: Keypress Input
References (2 earlier) <mailman.519.1434474965.13271.python-list@python.org> <Cl%fx.2$WK.0@fx07.iad> <mlq25a$188$1@reader1.panix.com> <5580CBC6.3000402@gmail.com> <CAHVvXxSH5fd2vMLYe4JXD6+jfQDfNjEnVuT_zdKtOZuDx70HLQ@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.617.1434667341.13271.python-list@python.org> (permalink)

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On 06/18/2015 01:35 PM, Oscar Benjamin wrote:
> I use the following. I found in testing that when you push the button it
> prints 'Button pressed' 10 times a second (in actual use it calls poweroff
> so I guess bounce isn't an issue there). Is there some reason it needs to
> be cleverer in this case?

Yes, that would be expected, given your code has a while loop that never
exits.  Just curious what you expect the code to do that it's not doing.

You are probably right that debouncing isn't important in your
application.  So just add your poweroff command after the print()
statement, and break out of the loop:

...
while True:
    time.sleep(0.1)
    if not GPIO.input(PIN_NUM):
        print('Button pressed')
        # run shutdown command here
        os.system('/usr/sbin/shutdown')
        break

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Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-03 18:22 +0000
  Re: Keypress Input Laura Creighton <lac@openend.se> - 2015-06-03 20:59 +0200
  Re: Keypress Input Gary Herron <gherron@digipen.edu> - 2015-06-03 12:15 -0700
  Re: Keypress Input Gary Herron <gherron@digipen.edu> - 2015-06-03 11:47 -0700
  Re: Keypress Input Laura Creighton <lac@openend.se> - 2015-06-04 12:50 +0200
  Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-06 18:28 +0000
    Re: Keypress Input Laura Creighton <lac@openend.se> - 2015-06-06 22:52 +0200
    Re: Keypress Input Chris Angelico <rosuav@gmail.com> - 2015-06-07 07:20 +1000
    Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-06-06 22:31 -0600
  Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-15 05:15 +0000
    Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-16 15:09 +0000
    Re: Keypress Input Christian Gollwitzer <auriocus@gmx.de> - 2015-06-19 07:20 +0200
      Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-20 14:59 +0000
      Re: Keypress Input Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-15 18:03 -0700
        Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-07-15 22:30 -0600
          Re: Keypress Input Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-16 10:22 -0700
            Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-07-16 15:27 -0600
        Re: Keypress Input Terry Reedy <tjreedy@udel.edu> - 2015-07-16 02:08 -0400
          Re: Keypress Input Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-16 11:30 -0700
        Re: Keypress Input Terry Reedy <tjreedy@udel.edu> - 2015-07-16 03:10 -0400
        Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-07-16 15:29 -0600
  Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-15 05:23 +0000
    Re: Keypress Input Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2015-06-15 12:22 +0100
      Re: Keypress Input Grant Edwards <invalid@invalid.invalid> - 2015-06-15 15:22 +0000
    Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-06-16 11:15 -0600
      Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-16 20:06 +0000
        Re: Keypress Input Grant Edwards <invalid@invalid.invalid> - 2015-06-16 20:49 +0000
          Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-06-16 19:22 -0600
          Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-06-18 16:42 -0600
      Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-06-20 15:02 +0000
        Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-06-20 10:30 -0600
  Re: Keypress Input Paul Rubin <no.email@nospam.invalid> - 2015-06-16 14:22 -0700
  Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-07-15 19:05 +0000
    Re: Keypress Input Michael Torrie <torriem@gmail.com> - 2015-07-15 13:17 -0600
      Re: Keypress Input John McKenzie <davros@bellaliant.net> - 2015-08-16 19:45 +0000

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