inexpensive pressure sensor
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Posts: 46,084
FYI
Go to any auto parts store and get a GM MAP sensor, they are absolute,
and come in three versions, 1 bar 0-15 inches of HG(-30"hg vac to
ambient sea level pressure) 2 bar (+/- 15 psi of sea level) and 3 bar
(essentially -30"HG to +30 psi of boost/pressure). Any GM dealership
can supply the pigtail connector for the sensor, so you can connect to
it. The signal will be analog 0 to +5 volts and will need to be
digitized via an ADC. Some ADC count will correspond to the local air
pressure depending on your altitude. You will need to get the local
station pressure or use a mercury stick to calibrate the output signal
to the corresponding pressure input range.
Have fun!
Ron A.
DDS, Inc.
Message: 9
Date: Mon, 10 Dec 2001 23:37:46 -0000
From: "tomatlarge" <tomatlarge@y...>
Subject: Pressure Transducer Sought
Can anyone recommend an inexpensive and readily available pressure
transducer for use in an automotive application. Ideally, it would
measure vacuum to about 25hg and pressure to about 30psi, with +/- 2%
precision or so, and produce a linear 0-5 volt dc output. I want to
use it with a Basic Stamp to measure vacuum and boost on a turbo
charged car. The vacuum reading is not as important as the pressure
reading, if there is a handy pressure only sensor out there. Thanks
in advance.
I don't know how well the plastic barb pressure inlet will do with
high
temperatures though. If you want a $20 solution, it may be worth
working out
a way to keep it cool.
I'm not sure if these devices will handle vacuum, of if so how.
Chris
>
>
> Can anyone recommend an inexpensive and readily available pressure
> transducer for use in an automotive application. Ideally, it would
> measure vacuum to about 25hg and pressure to about 30psi, with +/-
2%
> precision or so, and produce a linear 0-5 volt dc output. I want to
> use it with a Basic Stamp to measure vacuum and boost on a turbo
> charged car. The vacuum reading is not as important as the pressure
> reading, if there is a handy pressure only sensor out there. Thanks
> in advance.
Go to any auto parts store and get a GM MAP sensor, they are absolute,
and come in three versions, 1 bar 0-15 inches of HG(-30"hg vac to
ambient sea level pressure) 2 bar (+/- 15 psi of sea level) and 3 bar
(essentially -30"HG to +30 psi of boost/pressure). Any GM dealership
can supply the pigtail connector for the sensor, so you can connect to
it. The signal will be analog 0 to +5 volts and will need to be
digitized via an ADC. Some ADC count will correspond to the local air
pressure depending on your altitude. You will need to get the local
station pressure or use a mercury stick to calibrate the output signal
to the corresponding pressure input range.
Have fun!
Ron A.
DDS, Inc.
Message: 9
Date: Mon, 10 Dec 2001 23:37:46 -0000
From: "tomatlarge" <tomatlarge@y...>
Subject: Pressure Transducer Sought
Can anyone recommend an inexpensive and readily available pressure
transducer for use in an automotive application. Ideally, it would
measure vacuum to about 25hg and pressure to about 30psi, with +/- 2%
precision or so, and produce a linear 0-5 volt dc output. I want to
use it with a Basic Stamp to measure vacuum and boost on a turbo
charged car. The vacuum reading is not as important as the pressure
reading, if there is a handy pressure only sensor out there. Thanks
in advance.
I don't know how well the plastic barb pressure inlet will do with
high
temperatures though. If you want a $20 solution, it may be worth
working out
a way to keep it cool.
I'm not sure if these devices will handle vacuum, of if so how.
Chris
>
>
> Can anyone recommend an inexpensive and readily available pressure
> transducer for use in an automotive application. Ideally, it would
> measure vacuum to about 25hg and pressure to about 30psi, with +/-
2%
> precision or so, and produce a linear 0-5 volt dc output. I want to
> use it with a Basic Stamp to measure vacuum and boost on a turbo
> charged car. The vacuum reading is not as important as the pressure
> reading, if there is a handy pressure only sensor out there. Thanks
> in advance.