On Tuesday, March 1, 2022 11:21:16 AM EST Peter C. Wallace wrote:
> On Mon, 28 Feb 2022, gene heskett wrote:
> > Date: Mon, 28 Feb 2022 20:11:35 -0500
> > From: gene heskett <ghesk...@shentel.net>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > <emc-users@lists.sourceforge.net>
> >
> > To: "Enhanced Machine Controller (EMC)"
> > <emc-users@lists.sourceforge.net> Subject: [Emc-users] Q for Peter?
> >
> > Greetings Peter;
> >
> > The 7i76 has, I recall reading, the ability to do analog to digital
> > conversions on the first 4 of its inputs. But the full scale range is
> > 36 volts if I recall right. I don't recall the bit range, though,
> > whether its 8 bit, or 16.
> >
> > Would it be possible to lower the full scale range to 0-5 volts with
> > a
> > firmware change?
> >
> > I have acquired a couple pressure sensors rated at 0-10 psi with a 5
> > volt input, .5 to 4.5 volt outbut and want to use them to monitor,
> > and control the speed by pwm means as the mister(s) only need 3 or 4
> > psi to do their job if the nozzle is close enough to the cutting
> > face. Inch or so.
> >
> > Thanks Peter, take care and stay well.
> >
> > Cheers, Gene Heskett.
>
> Not with firmware but you could replace the low side resistor network
> on the first 4 inputs with say 22K (was 1.8K) to get about a 5V full
> scale range
And those are I assume, surface mount grain of sand?
I'll have to look, and my eyes are starting to fade.
Thanks Peter, stay well now.
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
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-Ed Howdershelt (Author, 1940)
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- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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