C5-Tyre(s) Deflated warning

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dieselnutjob
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Post by dieselnutjob »

so there are three or four similar products that I think I know about
the Protoctair Mini used by Citroen dealers according to you.
the Protoctair S.1244B mentioned by the Peugeot Planet
the Schrader tool 65144-V4 mentioned on the Schrader website, I suspect there might have been a V1-V3 that were simpler...
and the Symes Easy Force which looks very similar to the Protoctair products
which is mentioned here
http://www.symes.fr/systemesindustriels.html
Has anyone asked Symes if this thing exists and how much it costs?
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Post by Paul-R »

When I was trawling the Internet a year or so ago I seem to remember that the Symes tool is available in France for about €150 , which seemed rather high so I didn't follow it up.

I have also received this reply from AVE

AVE LF tool is 125 KHz. However, it is for AVE TPMS ONLY. The protocol of AVE LF tool is different from that of other brands. Plus, some TPMS may not have in-built LF antenna, so they do not respond to AVE LF remote controller.
Therefore, AVE LF tool does not work with other brands of TPMS.


Which is rather disappointing. I have to say that I think that 125KHz is 125KHz but I'm not going to risk £100 or so on a whim!
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dieselnutjob
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Post by dieselnutjob »

how about this antenna coil ?

£5.74

http://uk.farnell.com/rf-solutions/ant- ... dp/1304030
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Post by dieselnutjob »

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Post by dieselnutjob »

aha
I looked at the details of the ATAB5276 evaluation board (£300 if you want one :roll: ). It has a ferrite antenna on it.

The coil has an inductance of 345uH

A standard LW/MW ferrite from Maplin has a LW ferrite coil with an inductance of 4.1mH and a MW of 370uH.

£1.99 Maplin part LB12N.

I wonder if it will sink enough power to do the job
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Post by Paul-R »

DNJ

Is this to prototype an RF transmitter or for feeding the signal to an oscilloscope?
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Post by dieselnutjob »

A transmitter.

people have said that it can't be that hard to feed 125kHz into an antenna.

The only problem I can see is that according to the ATA5276 notes you have to be able to dump 1.5Ap (whatever that means) into a ferrite coil. I'm guessing that it's a fairly beefy coil because it has to generate enough magnetic field to penetrate through a wheel / tyre.

We may well have to wind our own coil to do this :roll:
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Post by Paul-R »

Ap is peak amperage. It's not the normal running current which seems to be 10mA.

I would have thought that for our own use either of the two links you gave would be OK. My preference would be the wound coil but that's more breakable in a workshop.

The ATA5276 is a surface mount device so good luck with making the soldered connections!
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

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Post by dieselnutjob »

this looks a better bet than that chip
http://www.discovercircuits.com/DJ-Circ ... erosc0.htm

but it would rely on a 680uH coil as that is what the circuit is tuned to
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Post by Paul-R »

That's a great simple circuit. There're still too many legs on the IC for me to feel comfortable with but does cut down on external components. It's a pity they don't also offer a circuit board mask as well. Still, it should be reasonably easy to knock up on Veroboard.
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dieselnutjob
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Post by dieselnutjob »

I reprogrammed my wheel sensors into the BSI on Saturday using a borrowed S.1244-B.
Inside the unit there is what I think is a 2.2nF cap in series with a coil on a Ferrite. The coil wire looks like about 32AWG.
I put a scope across the cap and coil combination.
What I see is a simple 125kHz square wave with amplitude a bit less than a volt.
I can't read part numbers off the coil but it appears to say A.C.M.E on it and a number that ends 5403. The beginning of the number is hidden under a tiewrap.
I'm sure that we can calculate the value of it easily anyway.
The tool is quite marginal to be honest. It has to be placed in a fairly specific place, I found near the edge of the rim seemed to work best.
I also notice that the amplitude of the wave seems to ramp down a little over the five seconds so maybe it really needs an alkaline battery instead of the cheapo zinc one nicked out of one of the kids toys...
I am thinking that a beefier coil run off the cigar lighter at 12V would be better.
Here is the trace
Image
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