Tire Pressure Sensor

L

Luhan Monat

Guest
Hi,

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.

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
 
Luhan Monat wrote:
Hi,

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.

Motorola made these -- I don't know if they went to On or FreeFall, but
Click to expand...
IIRC Digi-Key sells them.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
Tim Wescott wrote:
Luhan Monat wrote:

Hi,

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.

Motorola made these -- I don't know if they went to On or FreeFall, but
IIRC Digi-Key sells them.

Thanks, I found one for under $20 that goes to 36 psi. As long as it
Click to expand...
can take about 100% overload without dammage, that may do the trick.

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
 
On Thu, 07 Apr 2005 15:13:34 -0700, the renowned Luhan Monat <x@y.z>
wrote:

Hi,

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.
Click to expand...
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.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
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.
Click to expand...
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
 
Luhan Monat <x@y.z> wrote:

Hi,

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.
Click to expand...
Some car systems use an indirect method, where they measure RPM of all
the wheels via the ABS sensors and, if one wheel begins to roll faster
because it's diameter decreases with a pressure drop, it signals an
alert.

I suppose the same could be done on a bicycle, using two magnetic
pickups and a a form of deluxe speedometer that also does the speed
comparision and alerting..
It won't give you the absolute pressure, and it only works if ONE tire
loses pressure.

To reply, please remove one letter from each side of "@"
Spammers are VERMIN. Please kill them all.
 
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
Click to expand...
Trouble is, slow leaks are hard to spot while riding until its way too
late. This is a real issue, worth doing an RF/Micro system on the rear
wheel (which tends to get all the leaks). Test for both pressure level,
and change in pressure to warn as much ahead as possible.

I already have a micro based alarm system activated by RF remote. So, I
only need to do the hard work on the transmitting end. Something
sending out a code every 10 turns of the wheel or so to save on battery.

Yes, these systems already exist; but all I'm lacking is the sensor
itself to make a working device for myself. Also, the commercial ones
dont allow for 'leak rate' detection, they only trip a tranmitter on a
specific pressure.


--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
 
"Doug Warner" <dwarner22@ccharter.net> wrote in message
news:cnnb51dmorq97umculao0d35shdim2udk0@4ax.com...
Luhan Monat <x@y.z> wrote:

Hi,

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.
Click to expand...


What about a small adjustable pressure switch mounted on the valve
(counterweight opposite if needed). Thin wire back to a battery mounted near
the hub/axle. Then via LED or whatever to a frame mounted sensor which is
read every wheel rotation. Sorry no micro or Zigbee.
 
In article <4255E76A.D8BE3123@Hovnanian.com>,
"Paul Hovnanian P.E." <Paul@Hovnanian.com> wrote:

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.

That's correct, for now. But a mandate is coming soon.
Click to expand...
Yeah, in the US it's been mandated for most vehicles in 2008.

Another gadget to keep up safe! Jeesh, what ever happened to checking
your tire pressure weekly? The idiots seem to be driving our technology.
More junk to break down and have fixed for yearly inspection.

Al
 
On Thu, 07 Apr 2005 17:56:01 -0700, Luhan Monat <x@y.z> wrote:

Tim Wescott wrote:
Luhan Monat wrote:

Hi,

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.

Motorola made these -- I don't know if they went to On or FreeFall, but
IIRC Digi-Key sells them.

Thanks, I found one for under $20 that goes to 36 psi. As long as it
can take about 100% overload without dammage, that may do the trick.
Click to expand...
You can get a digital tire pressure gage with LCD readout at
walmart for ~$10. From there you would need to do some hacking to
get something useful for your application.
 
Hello Al,

Another gadget to keep up safe! Jeesh, what ever happened to checking
your tire pressure weekly? The idiots seem to be driving our technology.
More junk to break down and have fixed for yearly inspection.
Click to expand...
Common sense seems on the way out. I mean, if people even need a
reminder on coffee cups "caution - HOT - can cause serious injury".

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

Regards, Joerg

http://www.analogconsultants.com
 
On Fri, 08 Apr 2005 17:03:25 GMT, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hello Al,

Another gadget to keep up safe! Jeesh, what ever happened to checking
your tire pressure weekly? The idiots seem to be driving our technology.
More junk to break down and have fixed for yearly inspection.

Common sense seems on the way out. I mean, if people even need a
reminder on coffee cups "caution - HOT - can cause serious injury".

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

Regards, Joerg

http://www.analogconsultants.com
Click to expand...
In Boston, no ultrasonics need, they park by ear... clang, clang ;-)

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Hello Luhan,

Trouble is, slow leaks are hard to spot while riding until its way too
late. This is a real issue, worth doing an RF/Micro system on the rear
wheel (which tends to get all the leaks). Test for both pressure level,
and change in pressure to warn as much ahead as possible.
Click to expand...
True. But when I was in driving school they still taught us how to watch
for weird behavior of the vehicle. Low pressure, ice, slush etc. They
also taught us how to react.

Most cars are pretty good though. I was at a customer, had half their
R&D Department in a rented Saturn L300 when the right rear decided to
deflate on a county road. None of us even felt much until we were
parked, except that the car became somewhat sluggish. It remained
remarkably stable.

Regards, Joerg

http://www.analogconsultants.com
 
Hello Rob,

What about a small adjustable pressure switch mounted on the valve
(counterweight opposite if needed). Thin wire back to a battery mounted near
the hub/axle. Then via LED or whatever to a frame mounted sensor which is
read every wheel rotation. Sorry no micro or Zigbee.
Click to expand...
We did something similar for a large diesel drive shaft, to measure
torque flutter etc. which could indicate upcoming engine problems.
Balanced strain gauge on the shaft, inductive coupling to a stationary
coil. No micro, no Zigbee, no battery. Well, neither Zigbee nor
Bluetooth were around at that time anyway.

Regards, Joerg

http://www.analogconsultants.com
 
In article <m5fd511pvnq6ubmm5jrk3b8l800l3b580a@4ax.com>,
Jim Thompson <thegreatone@example.com> wrote:

On Fri, 08 Apr 2005 17:03:25 GMT, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Hello Al,

Another gadget to keep up safe! Jeesh, what ever happened to checking
your tire pressure weekly? The idiots seem to be driving our technology.
More junk to break down and have fixed for yearly inspection.

Common sense seems on the way out. I mean, if people even need a
reminder on coffee cups "caution - HOT - can cause serious injury".

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

Regards, Joerg

http://www.analogconsultants.com

In Boston, no ultrasonics need, they park by ear... clang, clang ;-)

...Jim Thompson
Click to expand...
In the 60's, while a student, the massive bumpers on my '47 Pontiac
could really dish it out.

Al
 
On Fri, 08 Apr 2005 17:33:07 GMT, Al <no.spam@wanted.com> wrote:

In article <m5fd511pvnq6ubmm5jrk3b8l800l3b580a@4ax.com>,
Jim Thompson <thegreatone@example.com> wrote:

On Fri, 08 Apr 2005 17:03:25 GMT, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Hello Al,

Another gadget to keep up safe! Jeesh, what ever happened to checking
your tire pressure weekly? The idiots seem to be driving our technology.
More junk to break down and have fixed for yearly inspection.

Common sense seems on the way out. I mean, if people even need a
reminder on coffee cups "caution - HOT - can cause serious injury".

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

Regards, Joerg

http://www.analogconsultants.com

In Boston, no ultrasonics need, they park by ear... clang, clang ;-)

...Jim Thompson

In the 60's, while a student, the massive bumpers on my '47 Pontiac
could really dish it out.

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

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
"Luhan Monat" <x@y.z> wrote in message news:Wgi5e.19$EX4.11@fed1read01...
Hi,

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.
Click to expand...
Instead of pressure, how about measuring how flat the tyre is ? Insert into
the valve stem a sort of plunger that is spring loaded against the inner
tube and tyre. Every time the wheel goes round the plunger will be
compressed and released. You could make the motion generate a voltage to
turn the electronics on, and then measure the change in inductance to get
the actual distance moved. You might even be able to extract enough power to
power a short transmit burst, and hence need no batteries ...

You would need a filter for an alarm so that the odd bump didn't register,
but a gradual change would ...

Dave




Posted Via Nuthinbutnews.Com Premium Usenet Newsgroup Services
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Si Ballenger wrote:

You can get a digital tire pressure gage with LCD readout at
walmart for ~$10. From there you would need to do some hacking to
get something useful for your application.
Click to expand...
Thanks, that's definitely worth checking out.

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
 
On Fri, 8 Apr 2005 19:57:07 +0100, "Dave Garnett"
<dave.garnett@metapurple.co.uk> wrote:

"Luhan Monat" <x@y.z> wrote in message news:Wgi5e.19$EX4.11@fed1read01...
Hi,

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.

Instead of pressure, how about measuring how flat the tyre is ? Insert into
the valve stem a sort of plunger that is spring loaded against the inner
tube and tyre. Every time the wheel goes round the plunger will be
compressed and released. You could make the motion generate a voltage to
turn the electronics on, and then measure the change in inductance to get
the actual distance moved. You might even be able to extract enough power to
power a short transmit burst, and hence need no batteries ...

You would need a filter for an alarm so that the odd bump didn't register,
but a gradual change would ...

Dave
Click to expand...
Not bad! But why not a fixed, but compressible, rod as part of the
wheel structure? If it touches repetitively, set off an alarm.

...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:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
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