Vacuum sensor help

General project help for Adafruit customers

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
doctor1
 
Posts: 1
Joined: Tue Dec 07, 2010 12:45 pm

Vacuum sensor help

Post by doctor1 »

I have a project in mind that requires the use of four vacuum sensors. Basically, I want to balance a four carburettor setup on a four cylinder motorcycle by measuring the vacuum available at the intake ports. I envision using an arduino with an LCD output to graphically show me their relative levels. In addition I'd like to measure the throttle position and indicate that on the LCD as a zero to 100 percent visual. I think the range needing to be meaured on the vacuum would be up to 15 inch hg, possibly even more. I have purchased an arduino in the past and basically done the 'hello world' with it. This noob is looking for some help.
Thanks...

User avatar
adafruit_support_bill
 
Posts: 88096
Joined: Sat Feb 07, 2009 10:11 am

Re: Vacuum sensor help

Post by adafruit_support_bill »

Freescale makes a range of integrated pressure sensors that are very easy to interface to the Arduino. I used some of these in a recent project.
http://www.freescale.com/files/sensors/ ... pdf?fpsp=1
That particular model reads 0-1020mm H20, but they make other pressure ranges as well.

The output of these devices is 0-5v, which is a perfect match for the arduino analog inputs.

User avatar
stinkbutt
 
Posts: 593
Joined: Wed Feb 17, 2010 2:40 am

Re: Vacuum sensor help

Post by stinkbutt »

Freescale makes air pressure sensors that appear to do what you're looking for, and they're intended for this sort of stuff.

http://www.freescale.com/webapp/sps/sit ... de=MPX4250
http://www.freescale.com/files/sensors/ ... X4250A.pdf

They're $14 a pop on mouser.

Sparkfun's also got some stuff, though I'm not certain it'd give you the resolution, range, and response that you'd need for an automotive application.

http://www.sparkfun.com/products/8161
http://www.sparkfun.com/products/9694

I don't think they're appropriate, but you can make that call. If you're dickering with the boost on your cycle you know more about automotive stuff than I do.

Also keep in mind it might make sense to get 5, not 4, and use one as a baseline for atmospheric pressure.

Oh, I just found some guy named spiff who worked with those sensors on an arduino.

User avatar
zener
 
Posts: 4567
Joined: Sat Feb 21, 2009 2:38 am

Re: Vacuum sensor help

Post by zener »

Look at automotive MAP sensors.

User avatar
wibertpaul
 
Posts: 1
Joined: Thu Sep 13, 2018 11:08 pm

Re: Vacuum sensor help

Post by wibertpaul »

i know its very old thread! but please help me out sensor of my vacuum is not working!

User avatar
adafruit_support_mike
 
Posts: 67454
Joined: Thu Feb 11, 2010 2:51 pm

Re: Vacuum sensor help

Post by adafruit_support_mike »

We can only offer advice based on the information we have, and 'not working' has almost no diagnostic value.

What have you done so far, what results did you expect, and what's the last thing that worked correctly before the first thing that didn't?

Locked
Please be positive and constructive with your questions and comments.

Return to “General Project help”