Need some advice.

Archiver · 2001-08-27 16:57

I am building a unit that is going to be measuring pressure, temperature, ph,
conductivity and possibly one or two more things. I am using a BS2P and would
like to find a 12 bit A/D converter with several channels, and probes that I can
use the I2c or the one wire protocol, neither of which I have used. Basically
I want to consolidate all these things together, use similar communication, use
minimal stamp lines and still have room for expansion. Any suggestions?
Ricky Konvicka
Electronic Engineer
BioTech International Inc.
www.biotechintl.com

[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver · 2001-08-27 17:43

For Ricky

Take a look at Texas TLC 2543. It has several channels, all addressable.
Uing one here and it works great. For coding examples search the Internet
for TLC2543 and go to Al Williams Owl2 Interface site. Owl2 has all the
codes for the 2543.

Sid

Archiver · 2001-08-27 18:06

Sid I take it you need an instumentation amp for each channel right? Is
there a nice IC out there that takes care of several channels?

Original Message

From: <Newzed@a...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, August 27, 2001 11:43 AM
Subject: Re: [noparse][[/noparse]basicstamps] Need some advice.

> For Ricky
>
> Take a look at Texas TLC 2543. It has several channels, all addressable.
> Uing one here and it works great. For coding examples search the Internet
> for TLC2543 and go to Al Williams Owl2 Interface site. Owl2 has all the
> codes for the 2543.
>
> Sid
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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Body of the message will be ignored.
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>
>

Archiver · 2001-08-27 18:14

Look at www.analog.com and www.cirrus.com

>From: "Ricky Konvicka" <ricky@m...>
>Reply-To: basicstamps@yahoogroups.com
>To: <basicstamps@yahoogroups.com>
>Subject: [noparse][[/noparse]basicstamps] Need some advice.
>Date: Mon, 27 Aug 2001 10:57:21 -0500
>
>I am building a unit that is going to be measuring pressure, temperature,
>ph, conductivity and possibly one or two more things. I am using a BS2P
>and would like to find a 12 bit A/D converter with several channels, and
>probes that I can use the I2c or the one wire protocol, neither of which I
>have used. Basically I want to consolidate all these things together, use
>similar communication, use minimal stamp lines and still have room for
>expansion. Any suggestions?
>Ricky Konvicka
>Electronic Engineer
>BioTech International Inc.
>www.biotechintl.com
>
>
>[noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

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Archiver · 2001-08-27 18:38

Ricky, the TLC2543 is a 12-bit 6 channel ADC. Stamp will read the output
directly.

Sid

Archiver · 2001-08-27 18:48

I don't make the OWL2. Isn't that Tracy?

Al Williams
AWC
* 8 channels of PWM
http://www.al-williams.com/awce/pak5.htm

>

Original Message

> From: Newzed@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=3R6HW7bgQDbgq_cLb7EE46cJaRmuadmujlGNZcsdnFTMh6V1eSESgBmbk0HzJV61wWo4bSE]Newzed@a...[/url
> Sent: Monday, August 27, 2001 11:44 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Need some advice.
>
>
> For Ricky
>
> Take a look at Texas TLC 2543. It has several channels, all
> addressable.
> Uing one here and it works great. For coding examples search the
> Internet
> for TLC2543 and go to Al Williams Owl2 Interface site. Owl2 has all the
> codes for the 2543.
>
> Sid
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>

Archiver · 2001-08-27 19:56

For Al

As usual you are correct. Hope Tracy doesn't see that.

Sid

Archiver · 2001-08-27 20:56

Look for Maxim's MAX186 - 8ch 12 bit serial SPI interface, internal ref.
ACJacques

Ricky Konvicka wrote:
>
> I am building a unit that is going to be measuring pressure, temperature, ph,
conductivity and possibly one or two more things. I am using a BS2P and would
like to find a 12 bit A/D converter with several channels, and probes that I can
use the I2c or the one wire protocol, neither of which I have used. Basically
I want to consolidate all these things together, use similar communication, use
minimal stamp lines and still have room for expansion. Any suggestions?
> Ricky Konvicka
> Electronic Engineer
> BioTech International Inc.
> www.biotechintl.com
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Archiver · 2001-08-27 20:57

Try the MAX186 for an ADC. It's an SPI device, so it takes two
lines. It's 12 bits of resolution and has 8 channels.

Paul

Archiver · 2001-08-27 21:45

Paul, is the addressing of the channels also controlled by the 2 wire
interface?

Original Message

From: <verhap@o...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, August 27, 2001 4:28 PM
Subject: Re: [noparse][[/noparse]basicstamps] Need some advice.

> Try the MAX186 for an ADC. It's an SPI device, so it takes two
> lines. It's 12 bits of resolution and has 8 channels.
>
> Paul
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

Archiver · 2001-08-28 16:59

>>>Take a look at Texas TLC 2543. It has several channels, all addressable.
>>>Uing one here and it works great. For coding examples search the Internet
>>>for TLC2543 and go to Al Williams Owl2 Interface site. Owl2 has all the
>>>codes for the 2543.

>>I don't make the OWL2. Isn't that Tracy?

>As usual you are correct. Hope Tracy doesn't see that.
>Ricky, the TLC2543 is a 12-bit 6 channel ADC. Stamp will read the output
>directly.

Aha! Right, the information is at
http://www.emesystems.com/OWL2face.htm#TLC2543
The TLC2543 has 11 external channels, and those extra channels are
one reason I favor it.

>I am building a unit that is going to be measuring pressure,
>temperature, ph, conductivity and possibly one or two more things.
>I am using a BS2P and would like to find a 12 bit A/D converter with
>several channels, and probes that I can use the I2c or the one wire
>protocol, neither of which I have used. Basically I want to
>consolidate all these things together, use similar communication,
>use minimal stamp lines and still have room for expansion. Any
>suggestions?

The SPI interface takes 4 (or 3) lines with one additional line per
device you add to the system. The I2C and one-wire protocols that
are available built into the BS2p take only two lines to daisy chain
many devices.

The pressure, pH and conductivity sensors are probably going to be
analog sensors, so you will need analog signal conditioning circuitry
to interface them to input channels of the ADC. I have a few
interface circuits on my web site. The temperature sensor you could
get in analog or directly in any of the different digital protocols.

-- good luck
Tracy

Need some advice.

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