Re: Numerical output from a single LED

Subject	Re: Numerical output from a single LED
Newsgroups	comp.arch.embedded
References	<qu330b$1366$1@gioia.aioe.org>
From	Clifford Heath <no.spam@please.net>
Message-ID	<anTNF.24134$1W2.9031@fx13.iad> (permalink)
Date	2019-12-29 12:32 +1100

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On 27/12/19 6:51 am, John Speth wrote:
> I'm working on a project in which the hardware is already designed. The 
> customer added a late stage requirement to output a numerical counter 
> value. The only output port is a single three-color (RGB) LED.
> 
> Does anybody have any ideas how one might drive the LED to output a 
> numerical value?

> In the past, I've experimented with single LED numerical output by 
> flashing the LED for each digit. The user must pay strict attention to 
> the LED without blinking to count flashes accurately.  It takes practice 
> to get right. I have not been able to find even a hint of possible 
> methods using Google.

That's exactly what Bosch did in the Motronic ML4.1 fuel injection 
system in the Alfa 75 Twin Spark (and probably other cars). It outputs 
fault codes if booted while a button is pressed. Useful if you don;t 
have a proper fault code reader.

It's tedious, but it does work. You can re-run the process multiple 
times if you miss a code.

Clifford Heath.

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Numerical output from a single LED John Speth <johnspeth@yahoo.com> - 2019-12-26 11:51 -0800
  Re: Numerical output from a single LED Paul Rubin <no.email@nospam.invalid> - 2019-12-26 12:21 -0800
  Re: Numerical output from a single LED Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2019-12-26 16:44 -0500
  Re: Numerical output from a single LED Theo <theom+news@chiark.greenend.org.uk> - 2019-12-26 22:59 +0000
    Re: Numerical output from a single LED upsidedown@downunder.com - 2019-12-27 06:53 +0200
  Re: Numerical output from a single LED Paul Rubin <no.email@nospam.invalid> - 2019-12-26 15:33 -0800
  Re: Numerical output from a single LED Rick C <gnuarm.deletethisbit@gmail.com> - 2019-12-26 23:29 -0800
    Re: Numerical output from a single LED Richard Damon <Richard@Damon-Family.org> - 2019-12-27 10:42 -0500
  Re: Numerical output from a single LED Robert Roland <fake@ddress.no> - 2019-12-27 18:10 +0100
    Re: Numerical output from a single LED Paul Rubin <no.email@nospam.invalid> - 2019-12-27 11:13 -0800
  Re: Numerical output from a single LED Mike Perkins <spam@spam.com> - 2019-12-27 20:20 +0000
  Re: Numerical output from a single LED Paul Rubin <no.email@nospam.invalid> - 2019-12-27 13:55 -0800
    Re: Numerical output from a single LED Rick C <gnuarm.deletethisbit@gmail.com> - 2019-12-27 17:54 -0800
      Re: Numerical output from a single LED Paul Rubin <no.email@nospam.invalid> - 2019-12-28 01:07 -0800
        Re: Numerical output from a single LED Rick C <gnuarm.deletethisbit@gmail.com> - 2019-12-28 08:24 -0800
          Re: Numerical output from a single LED Phil Martel <pomartel@comcast.net> - 2019-12-30 10:16 -0500
  Re: Numerical output from a single LED Clifford Heath <no.spam@please.net> - 2019-12-29 12:32 +1100

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