Tire Pressure Sensor

Joerg · Apr 12, 2005

Hello Frithiof,

In Europe some folks think they can't even live without ultrasound
parking aids in the bumpers. Oh man.

Infinately Preferable to VOLVO drivers who use the "rubber fenders" on the
bumpers to gauge the distance ... when parking *and* driving.

My first real driving after I got my license happened in Lyon, then
Madrid. Bumpers touched all the time and that was considered normal. If
something fell off in the course of action, oh well. The most important
part of a car seemed to be the horn, the least important the turn signal.

Regards, Joerg

http://www.analogconsultants.com

Joerg · Apr 12, 2005

Hello David,

Anyone who owned a Dauphine must be an experienced engineer; as we
gain experience from failure....

It takes a brave man to own a French car...

Sure, I wouldn't want to work on a DS21 where you can't even get a straw
between all the hoses and stuff. But I had a Citroen 2CV (the "ugly
duckling") for six years. It was good to me and got 50mpg on regular
gasoline. Even the new Prius can't do that and the 2CV engine was
basically a late 40's design.

Regards, Joerg

http://www.analogconsultants.com

Jim Thompson · Apr 12, 2005

On Tue, 12 Apr 2005 01:50:02 +0000 (UTC), David Lesher
<wb8foz@panix.com> wrote:

Jim Thompson <thegreatone@example.com> writes:

I had a '61 Dauphine with tubular wrap-arounds that offered
substantial protection.

Anyone who owned a Dauphine must be an experienced engineer; as we
gain experience from failure....

It takes a brave man to own a French car...

I finally sold it in '68... never really had a bit of trouble with
it... but: (1) I added an oil filter assembly to it from a Caravelle
and (2), I always fed it distilled water, so the aluminum block didn't
get munged.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice

480)460-2350 | |
| E-mail Address at Website Fax

Jim Thompson · Apr 12, 2005

On Mon, 11 Apr 2005 21:03:59 -0700, Jim Thompson
<thegreatone@example.com> wrote:

On Tue, 12 Apr 2005 01:50:02 +0000 (UTC), David Lesher
wb8foz@panix.com> wrote:

Jim Thompson <thegreatone@example.com> writes:

I had a '61 Dauphine with tubular wrap-arounds that offered
substantial protection.

Anyone who owned a Dauphine must be an experienced engineer; as we
gain experience from failure....

It takes a brave man to own a French car...

I finally sold it in '68... never really had a bit of trouble with
it... but: (1) I added an oil filter assembly to it from a Caravelle
and (2), I always fed it distilled water, so the aluminum block didn't
get munged.

...Jim Thompson

480)460-2350 | |
| E-mail Address at Website Fax

Fred Bloggs · Apr 8, 2005

Joerg wrote:

Hello Spehro,

I would like to make a remote tire pressure monitor (0-50 psi) for my
bicycle. Any ideas on where to get a sensor cheap? Accuracy is not
critical, as long as temperature drift is not excessive.

This is a killer app for cars 'n trucks. Sensor plus uP plus very low
power (eg. Zigbee) wireless interface = big bux for the semiconductor
companies. Especially if it gets government mandated.

It already exists. One of the guys on the German electronics forum
(Oliver Bartels) developed such a system. I believe he also used to race
Formula One rods so he should know what he's talking about.
Unfortunately the pubs are only in German:

http://www.tyretronic.com/index.php?m=200202___AANDE_200201&language=en

In that article it is mentioned that the US mandates it already but I
doubt that.

I can see this for car tires although I check mine every other week. But
for bicycles? On mine I just sit on it and then I know. Usually the
pressure is digital. It is either ok, or it went kapoof.

Regards, Joerg

http://www.analogconsultants.com

Well- the air volume is so small that it takes next to nothing to lose
pressure- they should be checked before every ride anyway- along with a
quick inspection of the frame for cracks. A gauge should be integral to
your pump- I have found that it is real easy to make that tire explode
with the hand pump- and then you will be hearing impaired for a few
hours or so.

David Lesher · Apr 13, 2005

Joerg <notthisjoergsch@removethispacbell.net> writes:

Hello David,

Anyone who owned a Dauphine must be an experienced engineer; as we
gain experience from failure....

It takes a brave man to own a French car...

Sure, I wouldn't want to work on a DS21 where you can't even get a straw
between all the hoses and stuff. But I had a Citroen 2CV (the "ugly
duckling") for six years. It was good to me and got 50mpg on regular
gasoline. Even the new Prius can't do that and the 2CV engine was
basically a late 40's design.

A friend owns a Deux Cheviot. You forgot to mention that engine is
17HP on a good day. His car was in the parking garage under the
building and could not make it up the ramp with us on board.
We got out and pushed...

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

Rich Grise · Apr 13, 2005

On Tue, 12 Apr 2005 08:21:21 -0700, Jim Thompson wrote:

On Mon, 11 Apr 2005 21:03:59 -0700, Jim Thompson <thegreatone@example.com
On Tue, 12 Apr 2005 01:50:02 +0000 (UTC), David Lesher <wb8foz@panix.com
Jim Thompson <thegreatone@example.com> writes:

I had a '61 Dauphine with tubular wrap-arounds that offered substantial
protection.

Anyone who owned a Dauphine must be an experienced engineer; as we gain
experience from failure....

It takes a brave man to own a French car...

I finally sold it in '68... never really had a bit of trouble with it...
but: (1) I added an oil filter assembly to it from a Caravelle and (2), I
always fed it distilled water, so the aluminum block didn't get munged.

And it was the only '61 Dauphine in the world with a 50Amp alternator ;-)

Oh, Heavens! Dauphine. Isn't that a Renault with two different horns, for
city and highway?

It isn't really my fault, but I looked up my Winnebago Le Sharo somewhere,
and discovered it has a Renault motor.

It does run, however, notwithstanding it needs new tires and various and
sundry to actually be roadworthy. ;-)

And I keep getting this nagging feeling that I should fill up the water
tank to prepare for Armageddon. Or at least for the next big quake. ;-)

Cheers!
Rich

Joerg · Apr 14, 2005

Hello David,

A friend owns a Deux Cheviot. You forgot to mention that engine is
17HP on a good day. His car was in the parking garage under the
building and could not make it up the ramp with us on board.
We got out and pushed...

They usually only came in 16HP, later they "upgraded" to 23HP and then
higher. Mine was 16HP. But it could climb all hills with a full load so
his must have had an engine or clutch problem. The 2CV had a really low
1st gear which helped on steep grades. The problem came when uphill on
the freeway and the truckers were about three feet behind you honking
their horns. That's where 16 horses just wasn't enough horses.

Regards, Joerg

http://www.analogconsultants.com

Jim Thompson · Apr 14, 2005

On Thu, 14 Apr 2005 21:19:35 GMT, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hello David,

A friend owns a Deux Cheviot. You forgot to mention that engine is
17HP on a good day. His car was in the parking garage under the
building and could not make it up the ramp with us on board.
We got out and pushed...

They usually only came in 16HP, later they "upgraded" to 23HP and then
higher. Mine was 16HP. But it could climb all hills with a full load so
his must have had an engine or clutch problem. The 2CV had a really low
1st gear which helped on steep grades. The problem came when uphill on
the freeway and the truckers were about three feet behind you honking
their horns. That's where 16 horses just wasn't enough horses.

Regards, Joerg

http://www.analogconsultants.com

IIRC my Dauphine was 36HP.

When I moved to Arizona in 1962, driving by myself (the wife and baby
daughter flew), I never got out of second gear while negotiating Salt
Creek Canyon ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice

480)460-2350 | |
| E-mail Address at Website Fax

David Lesher · Apr 14, 2005

Joerg <notthisjoergsch@removethispacbell.net> writes:

They usually only came in 16HP, later they "upgraded" to 23HP and then
higher. Mine was 16HP. But it could climb all hills with a full load so
his must have had an engine or clutch problem. The 2CV had a really low
1st gear which helped on steep grades. The problem came when uphill on
the freeway and the truckers were about three feet behind you honking
their horns. That's where 16 horses just wasn't enough horses.

I was being too generous, clearly....

The ramp up is just short of a 30 degree grade, I think.

He did OK once we got out; by then his engine was a bit warmer.
We still pushed a little to be sure he could not live it down...

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

douglas dwyer · Apr 15, 2005

In message <Gbl5e.12964$FN4.5993@newssvr21.news.prodigy.com>, Joerg
<notthisjoergsch@removethispacbell.net> writes

Hello Spehro,

I would like to make a remote tire pressure monitor (0-50 psi) for my
bicycle. Any ideas on where to get a sensor cheap? Accuracy is not
critical, as long as temperature drift is not excessive.
This is a killer app for cars 'n trucks. Sensor plus uP plus very
low
power (eg. Zigbee) wireless interface = big bux for the semiconductor
companies. Especially if it gets government mandated.

It already exists. One of the guys on the German electronics forum
(Oliver Bartels) developed such a system. I believe he also used to
race Formula One rods so he should know what he's talking about.
Unfortunately the pubs are only in German:

http://www.tyretronic.com/index.php?m=200202___AANDE_200201&language=en

In that article it is mentioned that the US mandates it already but I
doubt that.

I can see this for car tires although I check mine every other week.
But for bicycles? On mine I just sit on it and then I know. Usually the
pressure is digital. It is either ok, or it went kapoof.

Regards, Joerg

http://www.analogconsultants.com
Done with my assistance by Eveready (batt manufacturer) in the UK in the

70s coded Crystal controlled TX powering up every few seconds, inside
the tyre. Voltage controlled subcarrier prop to pressure
Sure its been done many times waiting for forcing function like
legislation .

--
dd

Tire Pressure Sensor

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