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10-04-2007, 05:22 PM
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#1
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Newbie
Join Date: Jun 2005
Location: Toronto, Ontario, Canada
Posts: 23
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detecting tire pressure
Hi,
I rented a car last weekend, and it's onboard computer knew the pressure of each tire. I want to put that into my car. Has anyone done this? I figure all you would need is a pressure sensor for each tire, but not sure how you would go about connecting it, i.e. wireless or wired, and power becomes an issue if wireless. Anyway, if anyone has done this, I would love to hear about how you went about it.
Thanks!
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10-05-2007, 01:07 AM
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#2
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Maximum Bitrate
Join Date: May 2006
Location: Ohio
Posts: 551
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A buddy of mine put tire pressure sensors in his Saab. They make kits for it. Pretty slick looking too.
__________________
Failure is not an option....
It's installed by default on every version of Windows.
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10-05-2007, 02:10 AM
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#3
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Fusion Brain Creator
Join Date: Mar 2006
Location: Colorado, but Canadian!
Posts: 8,862
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The easiest way to do it is the first way it was done by Porsche. Monitoring individual tire speeds as they rotate.
An underinflated tire will have a smaller diameter. Smaller diameter covering the same distance, means it rotates faster. Now "faster" is compared to the other tires. You can have up to 3 rotating faster because if all 4 were faster, then they would be the same if that makes sense. So by monitoring each wheel's independant speed, you can detect up to 3 simultaneous low pressure. And since all ABS enabled cars have individual speed sensors already all you have to do tap into all 4 and monitor them.
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10-05-2007, 11:04 AM
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#4
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Newbie
Join Date: Jun 2005
Location: Toronto, Ontario, Canada
Posts: 23
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Do you have a link to the kit your friend used?
The speed monitoring idea is good, but I would like to be able to tell the exact pressure of each tire, not just if they differ from one another.
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10-05-2007, 11:23 AM
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#5
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Newbie
Join Date: Jan 2007
Location: High Wycombe
Posts: 42
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Tyre pressure sensors in Saab
Quote:
A buddy of mine put tire pressure sensors in his Saab. They make kits for it. Pretty slick looking too.
Barry I'd be interested in any info you have on this product!
Regards
Colin
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10-05-2007, 11:44 AM
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#6
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Maximum Bitrate
Join Date: May 2005
Location: Lawrenceville GA
Posts: 709
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10-05-2007, 01:54 PM
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#7
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Confusion Master
Join Date: Sep 2003
Location: If you go down to the woods today, You're sure of
Posts: 11,929
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Quote: Originally Posted by fixerofallthing 
Cool, now we need one that can interface with a PC.
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10-05-2007, 02:10 PM
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#8
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_
Join Date: Mar 2004
Location: Little Elm, Texas
Posts: 13,481
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I wonder how hard it would be to hack that and send the information over serial or the like?
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10-05-2007, 02:20 PM
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#9
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Maximum Bitrate
Join Date: May 2005
Location: Lawrenceville GA
Posts: 709
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Quote: Originally Posted by RedGTiVR6 I wonder how hard it would be to hack that and send the information over serial or the like?
That is what I was thinking, or even via the wireless signals, if you could receive them on the correct freq.
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10-05-2007, 04:43 PM
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#10
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FLAC
Join Date: Apr 2006
Location: Greece
Posts: 1,029
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that is interesting
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10-06-2007, 06:19 AM
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#11
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Maximum Bitrate
Join Date: Aug 2005
Location: Italy
Posts: 558
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I've made my own TPMS by hacking an aftermarket kit bought on eBay and writing a RoadRunner plugin, in order to obtain the tyres informations directly in the front end, by an USB connection to the receiver.
__________________
_______________________________________
Car installation 95% [ ■■■■■■■■■■■■■■■■■■■■]
Current project: Parking sensor USB interface
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10-06-2007, 09:52 AM
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#12
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FLAC
Join Date: Apr 2006
Location: Greece
Posts: 1,029
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robby...share share share 
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10-06-2007, 11:30 AM
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#13
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Maximum Bitrate
Join Date: Aug 2003
Location: Federal Way, WA
Posts: 691
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http://www.tire-pressure-monitors.com/#displays
"For the racing specialist, RS232 links are available to enable conditions to be sent via computer telemetry to the pit."
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10-06-2007, 11:41 AM
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#14
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Maximum Bitrate
Join Date: Aug 2005
Location: Italy
Posts: 558
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Give me the time to organize a bit of documentation, and I'll publish all in the forum.
By the moment, this is a photo of the custom device I've made:
and this is a screenshot of the software in action:
__________________
_______________________________________
Car installation 95% [ ■■■■■■■■■■■■■■■■■■■■]
Current project: Parking sensor USB interface
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10-06-2007, 11:44 AM
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#15
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FLAC
Join Date: Apr 2006
Location: Greece
Posts: 1,029
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robby.. i beg you..make it and sell it. this is fantastic
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