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Re: How do you read digital inputs from microswitch, jumpers, dip-switches...?

From John Speth <johnspeth@yahoo.com>
Newsgroups comp.arch.embedded
Subject Re: How do you read digital inputs from microswitch, jumpers, dip-switches...?
Date 2018-09-20 05:35 -0700
Organization Aioe.org NNTP Server
Message-ID <po0460$10nr$1@gioia.aioe.org> (permalink)
References <pnvqld$pfh$1@dont-email.me>

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On 9/20/2018 2:52 AM, pozz wrote:
> Often I have digital inputs connected to switches managed by the user. 
> For example: microswitches, tactile switches, push-buttons, 
> dip-switches, simple jumpers and so on.
> 
> What is your preferred method to read the status of this inputs?

Typically dip-switches and jumpers are used for easy user system 
configuration so FW will read them at init time and never again.  Of 
course, requirements dictate it so it's not a rule.  If you really do 
need to read these kinds of switches periodically, your user 
requirements will tell you to debounce or not.  It comes down to the 
answer to this question: Will the consequences of ever misreading the 
switches have a negative effect on the function?

Push buttons and tactile switches are typically used in occasional user 
interactions.  They are typically debounced but, as always, you need to 
ask the same question as above about whether to debounce or not.

Advice from the trenches: A brand new switch will often not display 
characteristics requiring debouncing but it very well might as it ages 
and collects dirt, etc.  Plan for that possibility when you are deciding 
to debounce or not.

JJS

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Thread

How do you read digital inputs from microswitch, jumpers, dip-switches...? pozz <pozzugno@gmail.com> - 2018-09-20 11:52 +0200
  Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? John Speth <johnspeth@yahoo.com> - 2018-09-20 05:35 -0700
    Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? pozz <pozzugno@gmail.com> - 2018-09-21 09:42 +0200
      Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? David Brown <david.brown@hesbynett.no> - 2018-09-21 11:09 +0200
        Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Grant Edwards <invalid@invalid.invalid> - 2018-09-24 14:53 +0000
          Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? gnuarm.deletethisbit@gmail.com - 2018-09-29 12:34 -0700
      Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Andrew Smallshaw <andrews@sdf.org> - 2018-09-21 09:16 +0000
      Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? gnuarm.deletethisbit@gmail.com - 2018-09-21 06:22 -0700
        Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Robert Wessel <robertwessel2@yahoo.com> - 2018-09-21 10:04 -0500
          Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? lasselangwadtchristensen@gmail.com - 2018-09-21 14:47 -0700
            Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Robert Wessel <robertwessel2@yahoo.com> - 2018-09-22 21:57 -0500
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Andrew Smallshaw <andrews@sdf.org> - 2018-09-23 04:55 +0000
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? gnuarm.deletethisbit@gmail.com - 2018-09-22 22:55 -0700
          Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? gnuarm.deletethisbit@gmail.com - 2018-09-22 09:27 -0700
          Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Grant Edwards <invalid@invalid.invalid> - 2018-09-24 14:57 +0000
            Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Ed Prochak <edprochak@gmail.com> - 2018-10-05 09:52 -0700
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Richard Damon <Richard@Damon-Family.org> - 2018-10-05 14:40 -0400
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? gnuarm.deletethisbit@gmail.com - 2018-10-05 12:48 -0700
  Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Robert Wessel <robertwessel2@yahoo.com> - 2018-09-20 23:38 -0500
  Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-09-21 14:43 +0100
    Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Grant Edwards <invalid@invalid.invalid> - 2018-09-24 15:00 +0000
      Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Richard Damon <Richard@Damon-Family.org> - 2018-09-25 06:57 -0400
        Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-09-25 15:12 +0100
          Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Richard Damon <Richard@Damon-Family.org> - 2018-09-28 08:10 -0400
            Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-09-28 15:43 +0100
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Richard Damon <Richard@Damon-Family.org> - 2018-09-28 21:23 -0400
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Richard Damon <Richard@Damon-Family.org> - 2018-09-28 21:42 -0400
              Re: How do you read digital inputs from microswitch, jumpers, dip-switches...? Ed Prochak <edprochak@gmail.com> - 2018-10-05 10:04 -0700

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