ADC
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Posts: 46,084
OK- show me code to read a GP2D12 with rctime.
Larry
you wrote
>
> POT and RCTIME -- Some folks call it poor-man's ADC.
>
> **********
>
> > on board ADC with a BS2? When did that show up?
>
>
[noparse][[/noparse]Non-text portions of this message have been removed]
Larry
you wrote
>
> POT and RCTIME -- Some folks call it poor-man's ADC.
>
> **********
>
> > on board ADC with a BS2? When did that show up?
>
>
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
the output of the sensor as Vdd.
*******
> OK- show me code to read a GP2D12 with rctime.
> > POT and RCTIME -- Some folks call it poor-man's ADC.
> >
> > **********
> >
> > > on board ADC with a BS2? When did that show up?
keep up with the refresh rate of the sensor itself. The explanation of tau
and charge times after the example will show why. It takes too long. It's
simply not the same as real ADC
In a message dated 11/6/02 10:05:40 PM Pacific Standard Time,
basicstamps@yahoogroups.com writes:
> From: Rodent <daweasel@s...>
> Subject: Re: ADC
>
> Might try the RCTIME circuit example B in the latest Stamp manual except
> use
> the output of the sensor as Vdd.
>
> *******
>
> > OK- show me code to read a GP2D12 with rctime.
>
> > > POT and RCTIME -- Some folks call it poor-man's ADC.
> > >
> > > **********
> > >
> > > > on board ADC with a BS2? When did that show up?
>
>
>
>
>
>
[noparse][[/noparse]Non-text portions of this message have been removed]
thing, buy an ADC chip and let a Stamp talk to it.
**********
> Tha example won't give you anything like 10 bit resolution (or 12 bit )or
> keep up with the refresh rate of the sensor itself. The explanation of
tau
> and charge times after the example will show why. It takes too long. It's
> simply not the same as real ADC
> > Might try the RCTIME circuit example B in the latest Stamp manual except
> > use
> > the output of the sensor as Vdd.
> >
> > *******
> >
> > > OK- show me code to read a GP2D12 with rctime.
> >
> > > > POT and RCTIME -- Some folks call it poor-man's ADC.
> > > >
> > > > **********
> > > >
> > > > > on board ADC with a BS2? When did that show up?
have code
for a Basic Stamp to use the Sharp unit.
You can check their website for the manual there.
Original Message
From: Rodent [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=D2TdJ2pemicq1nLP11zYGMrcKICBUGO2aGwyGtvde5lbkDpsnMp08NErrrDOBjwcgheKKa9R511YUQ]daweasel@s...[/url
Sent: Thursday, November 07, 2002 5:01 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] ADC
No kidding? Like I said -- its a *POOR MAN'S* ADC. If you want the real
thing, buy an ADC chip and let a Stamp talk to it.
**********
> Tha example won't give you anything like 10 bit resolution (or 12 bit )or
> keep up with the refresh rate of the sensor itself. The explanation of
tau
> and charge times after the example will show why. It takes too long. It's
> simply not the same as real ADC
> > Might try the RCTIME circuit example B in the latest Stamp manual except
> > use
> > the output of the sensor as Vdd.
> >
> > *******
> >
> > > OK- show me code to read a GP2D12 with rctime.
> >
> > > > POT and RCTIME -- Some folks call it poor-man's ADC.
> > > >
> > > > **********
> > > >
> > > > > on board ADC with a BS2? When did that show up?
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resolution than on/off and is cheap. besides if you have an app that
has a narrow band, you can use an op-amp to get the part of the band
you want to measure very cheaply.
if you are looking for 12 bit, get a dedicated ADC.
Dave
--- In basicstamps@y..., Rodent <daweasel@s...> wrote:
> No kidding? Like I said -- its a *POOR MAN'S* ADC. If you want the
real
> thing, buy an ADC chip and let a Stamp talk to it.
>
> **********
>
> > Tha example won't give you anything like 10 bit resolution (or 12
bit )or
> > keep up with the refresh rate of the sensor itself. The
explanation of
> tau
> > and charge times after the example will show why. It takes too
long. It's
> > simply not the same as real ADC
>
> > > Might try the RCTIME circuit example B in the latest Stamp
manual except
> > > use
> > > the output of the sensor as Vdd.
> > >
> > > *******
> > >
> > > > OK- show me code to read a GP2D12 with rctime.
> > >
> > > > > POT and RCTIME -- Some folks call it poor-man's ADC.
> > > > >
> > > > > **********
> > > > >
> > > > > > on board ADC with a BS2? When did that show up?
[noparse][[/noparse]Non-text portions of this message have been removed]
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=zHNI_huV4TyUcmPZPqb3V6MNfSWYqfy5LvHAjTA6yn_rn0bAmu3TE3BbdhbPjxuLhoe32iC4O-TcVPk]smartdim@a...[/url
Sent: Tuesday, March 16, 2004 9:20 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] ADC
Any recomendations for a 12 bit serial ADC that interfaces nicely to a
BS2?
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smartdim@a... writes:
> Any recomendations for a 12 bit serial ADC that interfaces nicely to a BS2?
>
TLC2543 - 11 channels, 12-bit. If you need the code let me know.
Sid Weaver
W4EKQ
Port Richey, FL
[noparse][[/noparse]Non-text portions of this message have been removed]
Ken
LTC1298.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
[noparse][[/noparse]Non-text portions of this message have been removed]
Up to you.
Thank you.
Ken
TLC2543 - 11 channels, 12-bit. If you need the code let me know.
[noparse][[/noparse]Non-text portions of this message have been removed]
MAX186 (4 wire SPI).
Mike
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> Any recomendations for a 12 bit serial ADC that interfaces nicely
to a BS2?
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
upand_at_them <upand_at_them@y...> wrote:
Maxim has lots. I've used both the MAX127 (2 wire I2C) and the
MAX186 (4 wire SPI).
Mike
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> Any recomendations for a 12 bit serial ADC that interfaces nicely
to a BS2?
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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[noparse][[/noparse]Non-text portions of this message have been removed]
> Any recomendations for a 12 bit serial ADC that interfaces nicely
to a BS2?
>
>
My recomendations are to search the Parallax Application notes and
see if the units they cover in detail will work. IIRC, they offer an
8bit and 12 bit the LTC1298 is covered in good detail with programing.
If you need more channels, search the archives of the list to get
more data on the TLC2543 ADC that Sid mentioned.
You can get free samples of chips that you may not be able to
purchase or afford later on.
So if you are looking for recomendations, go with what is proven and
check your suppliers for availability and costs.
Dave
http://www.geocities.com/SiliconValley/Orchard/6633/max186.html
Mike
--- In basicstamps@yahoogroups.com, gooey <cantyant@y...> wrote:
> LTC 1298. There are a lot of post at parallax regarding this one.
>
>
> upand_at_them <upand_at_them@y...> wrote:
> Maxim has lots. I've used both the MAX127 (2 wire I2C) and the
> MAX186 (4 wire SPI).
>
> Mike
>
>
> --- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> > Any recomendations for a 12 bit serial ADC that interfaces nicely
> to a BS2?
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
>
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> basicstamps-unsubscribe@yahoogroups.com
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Subject and Body of the message will be ignored.
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> Yahoo! Groups Links
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> [noparse][[/noparse]Non-text portions of this message have been removed]
<upand_at_them@y...> wrote:
> And here's one for using the MAX186:
>
> http://www.geocities.com/SiliconValley/Orchard/6633/max186.html
>
> Mike
Not that the MAX186 is a bad chip, but I would never design for a
$22.00 chip when there are similar chips for lots less.
Dave
Nevermind the 186.
Mike
--- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
wrote:
> --- In basicstamps@yahoogroups.com, "upand_at_them"
> <upand_at_them@y...> wrote:
> > And here's one for using the MAX186:
> >
> > http://www.geocities.com/SiliconValley/Orchard/6633/max186.html
> >
> > Mike
>
>
>
> Not that the MAX186 is a bad chip, but I would never design for a
> $22.00 chip when there are similar chips for lots less.
>
> Dave