Sensor chips
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Posts: 46,084
Have any of you worked with micro-machined silicon pressure sensors? They
would seem to be a natural device to input to a stamp....I see them
advertised here and there, but I can't find anyone who has used them...
Chris
would seem to be a natural device to input to a stamp....I see them
advertised here and there, but I can't find anyone who has used them...
Chris
Comments
They make an enormous range with various specs. Some are temperature
compensated, some are internally amplified. A typical non-amplified output
is 0-40mV for 0-4" water. They are not cheap but quite good. DigiKey sells
them. Omega also sells similar gauges - without any brand name. A google
search will suggest more.
Dov
Original Message
From: <chris01@t...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, October 08, 2001 6:47 PM
Subject: [noparse][[/noparse]basicstamps] Sensor chips
> Have any of you worked with micro-machined silicon pressure sensors? They
> would seem to be a natural device to input to a stamp....I see them
> advertised here and there, but I can't find anyone who has used them...
>
> Chris
>
>
> To UNSUBSCRIBE, just send mail to:
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Body of the message will be ignored.
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>
>
transparent 'bubble' with a small port that extends to the tire valve. I
have searched digi-key and many other vendors, but I only find these chips
at semi manufacturers sites. I have received no responses to my inquires or
sample requests, nor do I see the technology at this level available in any
catalogs.
I do also see the round can type devices at prices that would completely
consume the parts cost budget for my project.
While I am thrilled at hearing that someone has worked with differential
pressure sensing applications, mine is absolute, yet, I hope to learn from
your experience. Your reply is the most encouragement I have received to
date on this project. How did you mount the differential sensors, and have
you ever used them to measure H2O pressure?
In some areas (where I suspect a select few are reaping the rewards)it is
indeed frustrating when the low-level factors and components of a certain
technology are kept behind large, barred gates. In this case, I see
manufacturers using these less-expensive devices for simple process
monitoring applications by assembling them into fancy consumer oriented
enclosures, shipping them as products in 4-color printed cartons that cost
as much as the product, and getting many hundreds of dollars for each one
they sell.
It irks me because any stamper worth his/her salt could accomplish the same
for what is literally a fraction of the cost.
OK, OK, I'll stop now...
Chris
>
Original Message
> From: Dov Yassky [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=UJLC1ws6hPTEjKzxxX_592c-twvdTORIthxLXS-DHYdxNJvzVtvCod-7zNCKtAjFnB6xQjSPbNkq2Ms]dovy@b...[/url
> Sent: Tuesday, October 09, 2001 6:50 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Sensor chips
>
>
> I have used SenSym low pressure differential gauges (4 & 8"
> water head).
> They make an enormous range with various specs. Some are temperature
> compensated, some are internally amplified. A typical
> non-amplified output
> is 0-40mV for 0-4" water. They are not cheap but quite good.
> DigiKey sells
> them. Omega also sells similar gauges - without any brand
> name. A google
> search will suggest more.
>
> Dov
>
>
Original Message
> From: <chris01@t...>
> To: <basicstamps@yahoogroups.com>
> Sent: Monday, October 08, 2001 6:47 PM
> Subject: [noparse][[/noparse]basicstamps] Sensor chips
>
>
> > Have any of you worked with micro-machined silicon pressure
> sensors? They
> > would seem to be a natural device to input to a stamp....I see them
> > advertised here and there, but I can't find anyone who has
> used them...
> >
> > Chris
> >
> >
> > 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/
> >
> >
>
>
> 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/
>
>
>
Perhaps I'm missing the point here, but I see the "inflated" price
as a possible result of low demand from the customer.
What is more likely, is that the manufacturer of the IC, decided it
was more cost effective to slip this chip in under a "test die" rev,
and making it a proprietary chip, thus avoiding the costs of a full
"tape out" including specs and operation parameters for the customer.
The overall technology is not at all that difficult, A simple whetstone
bridge would do the trick. Putting that on silicon in a way that it is
properly exposed, and preventing other components on the IC from not
being exposed is the hard part.
>In my $5 digital tire pressure gauge I can see a small outline chip inside a
>transparent 'bubble' with a small port that extends to the tire valve. I
>have searched digi-key and many other vendors, but I only find these chips
>at semi manufacturers sites. I have received no responses to my inquires or
>sample requests, nor do I see the technology at this level available in any
>catalogs.
>I do also see the round can type devices at prices that would completely
>consume the parts cost budget for my project.
>
>While I am thrilled at hearing that someone has worked with differential
>pressure sensing applications, mine is absolute, yet, I hope to learn from
>your experience. Your reply is the most encouragement I have received to
>date on this project. How did you mount the differential sensors, and have
>you ever used them to measure H2O pressure?
>
>In some areas (where I suspect a select few are reaping the rewards)it is
>indeed frustrating when the low-level factors and components of a certain
>technology are kept behind large, barred gates. In this case, I see
>manufacturers using these less-expensive devices for simple process
>monitoring applications by assembling them into fancy consumer oriented
>enclosures, shipping them as products in 4-color printed cartons that cost
>as much as the product, and getting many hundreds of dollars for each one
>they sell.
>
>It irks me because any stamper worth his/her salt could accomplish the same
>for what is literally a fraction of the cost.
>OK, OK, I'll stop now...
>Chris
Beau Schwabe IC Mask Designer
National Semiconductor Wired Communications Division
500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
There is a twin-port pressure sensor we used where I used to work that
detected the difference in pressure between the two ports. We used it to
sense rising liquid via a dip tube in a tank.
Its quite a bit larger than what you described in the tire gauge, but it
works well. I believe its also used in the Twin-Max tool used to synchronize
motorcycle carburetors. Unfortunately I'm having a brain-fart right now and
can't remember the manufacturer. I know Tanner's Electronics in Dallas has a
box of them in their display case.
Original Message
> >In my $5 digital tire pressure gauge I can see a small outline chip
inside a
> >transparent 'bubble' with a small port that extends to the tire valve. I
> >have searched digi-key and many other vendors, but I only find these
chips
> >at semi manufacturers sites. I have received no responses to my inquires
or
> >sample requests, nor do I see the technology at this level available in
any
> >catalogs.
> >I do also see the round can type devices at prices that would completely
> >consume the parts cost budget for my project.
> >
> >While I am thrilled at hearing that someone has worked with differential
> >pressure sensing applications, mine is absolute, yet, I hope to learn
from
> >your experience. Your reply is the most encouragement I have received to
> >date on this project. How did you mount the differential sensors, and
have
> >you ever used them to measure H2O pressure?
inexpensive and low-power. I am willing to do all the signal conditioning
and processing outside of the sensor chip. Is the part at Tanner's small?
BTW, a nice cold beer helps with that kind of brain problem....or is it too
early in the day?
Chris
>
Original Message
> From: Rodent [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=GoEu493r-rra9iYo-PG6FkxORVHRdiqfAe-3ZgFFimAa3dgLtBN5XIf-UjzA4xTy4pixbuUH8I4jSjto]daweasel@s...[/url
> Sent: Tuesday, October 09, 2001 12:49 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Sensor chips
>
>
> Do you want small, or do you just want differential pressure?
>
> There is a twin-port pressure sensor we used where I used to work that
> detected the difference in pressure between the two ports. We
> used it to
> sense rising liquid via a dip tube in a tank.
>
> Its quite a bit larger than what you described in the tire
> gauge, but it
> works well. I believe its also used in the Twin-Max tool used
> to synchronize
> motorcycle carburetors. Unfortunately I'm having a brain-fart
> right now and
> can't remember the manufacturer. I know Tanner's Electronics
> in Dallas has a
> box of them in their display case.
>
>
Original Message
>
> > >In my $5 digital tire pressure gauge I can see a small outline chip
> inside a
> > >transparent 'bubble' with a small port that extends to the
> tire valve. I
> > >have searched digi-key and many other vendors, but I only
> find these
> chips
> > >at semi manufacturers sites. I have received no responses
> to my inquires
> or
> > >sample requests, nor do I see the technology at this level
> available in
> any
> > >catalogs.
> > >I do also see the round can type devices at prices that
> would completely
> > >consume the parts cost budget for my project.
> > >
> > >While I am thrilled at hearing that someone has worked
> with differential
> > >pressure sensing applications, mine is absolute, yet, I
> hope to learn
> from
> > >your experience. Your reply is the most encouragement I
> have received to
> > >date on this project. How did you mount the differential
> sensors, and
> have
> > >you ever used them to measure H2O pressure?
>
>
>
>
> 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/
>
>
remember right, the original use was in a home blood pressure measurement
device.
In our application, one port was at atmospheric pressure, the other was
connected to a long weighted tube that hung down in a fuel tank. As long as
the fluid level was below the end of the tube, the pressure reading was
zero. As the fluid level rose, it covered the end of the tube. This caused
the pressure in the tube to rise, which made it greater than atmospheric
pressure and triggered our circuit.
I'm still having a brainfart, but here is something I ran across while
searching:
http://content.honeywell.com/sensing/prodinfo/pressure/
I think I'll have a beer and see if that helps.
Original Message
> Thanks. I need to sense absolute pressure. My goal requires small,
> inexpensive and low-power. I am willing to do all the signal conditioning
> and processing outside of the sensor chip. Is the part at Tanner's small?
> BTW, a nice cold beer helps with that kind of brain problem....or is it
too
> early in the day?
> > Do you want small, or do you just want differential pressure?
> >
> > There is a twin-port pressure sensor we used where I used to work that
> > detected the difference in pressure between the two ports. We
> > used it to
> > sense rising liquid via a dip tube in a tank.
> >
> > Its quite a bit larger than what you described in the tire
> > gauge, but it
> > works well. I believe its also used in the Twin-Max tool used
> > to synchronize
> > motorcycle carburetors. Unfortunately I'm having a brain-fart
> > right now and
> > can't remember the manufacturer. I know Tanner's Electronics
> > in Dallas has a
> > box of them in their display case.
glass display case at the back of the store. They are kinda eye-shaped with
two small hose fittings on one side and 4 leads on the other.
Original Message
> Thanks again. It may be small enough.....now I'm off to search out the
> supplier.
> > They are about the diameter of a 50-cent piece and about 1/2"
> > thick. If I
> > remember right, the original use was in a home blood pressure
> > measurement
> > device.
supplier.
C
>
Original Message
> From: Rodent [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=QI4vHecqGWiZjc84Nh7iizVfMnMRF6mGaRlsOX5c_w7KwegqJikURmK5FkydVY1pTeLQA27L2d1Fhd3-]daweasel@s...[/url
> Sent: Tuesday, October 09, 2001 1:22 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Sensor chips
>
>
> They are about the diameter of a 50-cent piece and about 1/2"
> thick. If I
> remember right, the original use was in a home blood pressure
> measurement
> device.
Try to go to SenSym's pages and as far as I remember you'll be able to
download a lot of info. They make absolute gauges too. Their prices are in
the tens of dollars, not hundreds but they don't sell directly. What is the
pressure you want to measure? Is the gauge supposed to come in contact with
liquid or gas? The lower the pressure is the more problems you'll have.
Dov
Original Message
From: <chris01@t...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, October 09, 2001 6:24 PM
Subject: RE: [noparse][[/noparse]basicstamps] Sensor chips
> In my $5 digital tire pressure gauge I can see a small outline chip inside
a
> transparent 'bubble' with a small port that extends to the tire valve. I
> have searched digi-key and many other vendors, but I only find these chips
> at semi manufacturers sites. I have received no responses to my inquires
or
> sample requests, nor do I see the technology at this level available in
any
> catalogs.
> I do also see the round can type devices at prices that would completely
> consume the parts cost budget for my project.
>
> While I am thrilled at hearing that someone has worked with differential
> pressure sensing applications, mine is absolute, yet, I hope to learn from
> your experience. Your reply is the most encouragement I have received to
> date on this project. How did you mount the differential sensors, and have
> you ever used them to measure H2O pressure?
>
> In some areas (where I suspect a select few are reaping the rewards)it is
> indeed frustrating when the low-level factors and components of a certain
> technology are kept behind large, barred gates. In this case, I see
> manufacturers using these less-expensive devices for simple process
> monitoring applications by assembling them into fancy consumer oriented
> enclosures, shipping them as products in 4-color printed cartons that cost
> as much as the product, and getting many hundreds of dollars for each one
> they sell.
>
> It irks me because any stamper worth his/her salt could accomplish the
same
> for what is literally a fraction of the cost.
> OK, OK, I'll stop now...
> Chris
>
>
> >
Original Message
> > From: Dov Yassky [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RElzGCi1qceP0pIoKEQYbURdArNYHOihjK_EWG6jBwBQojQtk7JPEk9olFZ5p91jWvmQIOmhImQ]dovy@b...[/url
> > Sent: Tuesday, October 09, 2001 6:50 AM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] Sensor chips
> >
> >
> > I have used SenSym low pressure differential gauges (4 & 8"
> > water head).
> > They make an enormous range with various specs. Some are temperature
> > compensated, some are internally amplified. A typical
> > non-amplified output
> > is 0-40mV for 0-4" water. They are not cheap but quite good.
> > DigiKey sells
> > them. Omega also sells similar gauges - without any brand
> > name. A google
> > search will suggest more.
> >
> > Dov
> >
> >
Original Message
> > From: <chris01@t...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Monday, October 08, 2001 6:47 PM
> > Subject: [noparse][[/noparse]basicstamps] Sensor chips
> >
> >
> > > Have any of you worked with micro-machined silicon pressure
> > sensors? They
> > > would seem to be a natural device to input to a stamp....I see them
> > > advertised here and there, but I can't find anyone who has
> > used them...
> > >
> > > Chris
> > >
> > >
> > > 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/
> > >
> > >
> >
> >
> > 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/
> >
> >
> >
>
>
> 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/
>
>
My application is simple water depth, 1 ft. resolution to a minimum of 6
atm.
>
Original Message
> From: Dov Yassky [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8uDq8MPKR69VRP0rA894d7zg-lw94SYd-_56UOOU11psma6qiSPkmxxuJMJU-0ztewwn-Ne66ZLq]dovy@b...[/url
> Sent: Wednesday, October 10, 2001 11:51 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Sensor chips
>
>
> Chris,
>
> Try to go to SenSym's pages and as far as I remember you'll be able to
> download a lot of info. They make absolute gauges too.
> Their prices are in
> the tens of dollars, not hundreds but they don't sell
> directly. What is the
> pressure you want to measure? Is the gauge supposed to come
> in contact with
> liquid or gas? The lower the pressure is the more problems
> you'll have.
>
> Dov
>
>
Original Message
> From: <chris01@t...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, October 09, 2001 6:24 PM
> Subject: RE: [noparse][[/noparse]basicstamps] Sensor chips
>
>
> > In my $5 digital tire pressure gauge I can see a small
> outline chip inside
> a
> > transparent 'bubble' with a small port that extends to the
> tire valve. I
> > have searched digi-key and many other vendors, but I only
> find these chips
> > at semi manufacturers sites. I have received no responses
> to my inquires
> or
> > sample requests, nor do I see the technology at this level
> available in
> any
> > catalogs.
> > I do also see the round can type devices at prices that
> would completely
> > consume the parts cost budget for my project.
> >
> > While I am thrilled at hearing that someone has worked with
> differential
> > pressure sensing applications, mine is absolute, yet, I
> hope to learn from
> > your experience. Your reply is the most encouragement I
> have received to
> > date on this project. How did you mount the differential
> sensors, and have
> > you ever used them to measure H2O pressure?
> >
> > In some areas (where I suspect a select few are reaping the
> rewards)it is
> > indeed frustrating when the low-level factors and
> components of a certain
> > technology are kept behind large, barred gates. In this case, I see
> > manufacturers using these less-expensive devices for simple process
> > monitoring applications by assembling them into fancy
> consumer oriented
> > enclosures, shipping them as products in 4-color printed
> cartons that cost
> > as much as the product, and getting many hundreds of
> dollars for each one
> > they sell.
> >
> > It irks me because any stamper worth his/her salt could
> accomplish the
> same
> > for what is literally a fraction of the cost.
> > OK, OK, I'll stop now...
> > Chris
> >
> >
> > >
Original Message
> > > From: Dov Yassky [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8uDq8MPKR69VRP0rA894d7zg-lw94SYd-_56UOOU11psma6qiSPkmxxuJMJU-0ztewwn-Ne66ZLq]dovy@b...[/url
> > > Sent: Tuesday, October 09, 2001 6:50 AM
> > > To: basicstamps@yahoogroups.com
> > > Subject: Re: [noparse][[/noparse]basicstamps] Sensor chips
> > >
> > >
> > > I have used SenSym low pressure differential gauges (4 & 8"
> > > water head).
> > > They make an enormous range with various specs. Some are
> temperature
> > > compensated, some are internally amplified. A typical
> > > non-amplified output
> > > is 0-40mV for 0-4" water. They are not cheap but quite good.
> > > DigiKey sells
> > > them. Omega also sells similar gauges - without any brand
> > > name. A google
> > > search will suggest more.
> > >
> > > Dov
> > >
> > >
Original Message
> > > From: <chris01@t...>
> > > To: <basicstamps@yahoogroups.com>
> > > Sent: Monday, October 08, 2001 6:47 PM
> > > Subject: [noparse][[/noparse]basicstamps] Sensor chips
> > >
> > >
> > > > Have any of you worked with micro-machined silicon pressure
> > > sensors? They
> > > > would seem to be a natural device to input to a
> stamp....I see them
> > > > advertised here and there, but I can't find anyone who has
> > > used them...
> > > >
> > > > Chris
> > > >
> > > >
> > > > 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/
> > > >
> > > >
> > >
> > >
> > > 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/
> > >
> > >
> > >
> >
> >
> > 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/
> >
> >
>
>
> 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/
>
>