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PICList Thread
'Vaccum sensors/switches'
1997\12\04@012620 by Steven J Tucker

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How might I interface a vaccum system to a pic?   Does anyone make
sensors that can be used to detect various levels of vaccum, like
some automotive sensors do?

My goal is to replace some extinct vaccum switches and sensors in my
old chevy to make the system more configurable, and controllable, like some
of the really expensive performance carb systems do.

Steve

1997\12\04@031405 by Dmitry A.Liakin

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Look for  example to ftp://193.124.226.41/vac_.pdf

Dmitry A.Liakin
Institute of Theoretical and Experimental Physics
Moscow. Russia.
spam_OUTliakinTakeThisOuTspamvitep5.itep.ru

1997\12\04@035749 by Dave Celsnak

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On Thu, 4 Dec 1997, Steven J Tucker wrote:

> How might I interface a vaccum system to a pic?   Does anyone make
>  sensors that can be used to detect various levels of vaccum, like
>  some automotive sensors do?
Check out Motorola.  I am using their 2.5 Bar MAP sensor.  This sensor
goes up to 22 psi for Turbocharged applications.
>
> My goal is to replace some extinct vaccum switches and sensors in my
>  old chevy to make the system more configurable, and controllable, like some
>  of the really expensive performance carb systems do.
Motorola has a wide range of sensors.

-Dave Celsnak

1997\12\04@111626 by Tom Handley

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  Steve, how old a Chevy? Do you want switches or analog sensors? Are
you talking about "vacuum" advance? You will need a pressure sensor/switch.
Sensym and Motorola have a variety of sensors. If by "old", do you mean
1955/56? If so, I might want to buy it ;-)

  - Tom

At 01:24 AM 12/4/97 -0500, you wrote:
{Quote hidden}

1997\12\04@201509 by patrick_roberts
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Steven J Tucker wrote:
>
> How might I interface a vaccum system to a pic?   Does anyone make
>  sensors that can be used to detect various levels of vaccum, like
>  some automotive sensors do?
>
> My goal is to replace some extinct vaccum switches and sensors in my
>  old chevy to make the system more configurable, and controllable, like some
>  of the really expensive performance carb systems do.
>
> Steve
A standard chevy MAP sensor outputs 0 - 5v over 0"hg to 30"hg. They are
$30.

PR

1997\12\06@033242 by Randy Jones

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Steve,

As another message indicated, you can use a common automotive MAP sensor,
which has the advantage that it is designed for the harsh environment in
the engine compartment.  My favorite is the Mitsubishi Mirage sensor,
MD178243, which sells at the dealers for approx ten bucks!  It has three
pins: +5.0v, GND, and signal out.  The output voltage is 4v at 1
atmosphere, decreasing to approx 0v at complete vacuum.  I was playing with
one earlier tonight, in fact!  This particular MAP sensor (unlike some
others) also has sufficiently quick response to allow observation of the
individual vacuum pulses from each cylinder as the engine is running.  This
can be a great diagnostic tool for bad valves, cam lobes, etc.  I have more
info on that subject if anyone is interested.

Oh... you can also get the Mitsu sensor at Dodge dealers (probably any
Chrysler outlet, actually) since they sold the Mirage under a different
name (Summit??).  Same part number works.

Randy

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{Quote hidden}

some
>  of the really expensive performance carb systems do.
>
> Steve

1997\12\06@211342 by patrick_roberts

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Randy Jones wrote:
{Quote hidden}

I am very interested in all the info you have. The price is awesome.
e-mail direct is you feel it is appropriate

PR

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