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Old 04-05-2018, 04:46 PM   #41
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Originally Posted by Chance View Post
If youíre asking where these two meet, you donít need much math. The name gives it away.
Yup!
Zero is still zero...
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Old 04-07-2018, 12:21 PM   #42
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side question..... something I've been wondering but have never taken time to research....

I have a TST 507 system, their older model. The one with user replaceable batteries
TST also has another system with batteries you can't change.
They say that they are not compatible with each other.... you can't interchange the sensors.

Why?
Are they set up on different bluetooth frequencies?

When buying replacements, could I buy any companies sensors with user replaceable batteries? How could I tell which ones would work?
These "Blu" sensors you bought 'look' the same....but are they?

I'd like to be able to buy replacement sensors on the road if I ever need to, without being forced to buy from tst and wait for them. (like the ones they sell on the shelf at camping world)
AND it would be good to price shop too. I just don't know what to look for!
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Old 04-07-2018, 01:25 PM   #43
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I can't definitively answer that without buying a bunch of different sensors.

My guess is that, for the bluetooth sensors, they all use the same hardware but each manufacturer uses their own identifier. This would mean that you would have to use that manufacturer's software to see their sensor.

Even the two versions from the same manufacturer (replaceable vs nonreplaceable batteries) probably have different identifiers.
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Old 04-14-2018, 04:01 PM   #44
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When trying to determine what level I should alarm at for the temperature sensors, I ran across this very informative thread:

Tire Temperature - Tires - FMCA Motorhome Forums

Just thought I'd include it here for those who are curious.
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Old 04-25-2018, 02:25 PM   #45
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Just curious, can any of the aftermarket TPMS systems read the sensors that are already installed on a GM toad. Seems that would be nice to not have redundant sensors on the toad.
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Old 04-25-2018, 02:26 PM   #46
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OK JamieGeek - the next step is to hack toad TPMS and combine.
I agree!
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Old 04-25-2018, 03:22 PM   #47
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I agree!
LOL Which toad? e.g. which manufacturer--I'm guessing they are similar between OEMs but not completely so.

Toad's built-in TPMS would probably be on one of the vehicle's CAN busses (I'm guessing a medium-speed one sending readings to the dashboard). Thus I'd first have to get one of the OBD-II modules working with my software (something I did consider at one point except that Forscan works so well). Then figure out the messages that report back the tire pressures (they report all the time--at least they do in my C-Max: If I put the dashboard in diagnostic mode I can see the pressure values for each tire).

Now multiply that effort by 3? 4? 5? (Ford, GM, Chrysler, Honda, Toyota, etc.)

Much easier to just get extra sensors and put them on the valve stems.
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Old 04-25-2018, 04:25 PM   #48
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...Much easier to just get extra sensors and put them on the valve stems.
Easier? Yes!

But which method will provide the most satisfaction???
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Old 04-25-2018, 04:58 PM   #49
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Easier? Yes!

But which method will provide the most satisfaction???
Getting extra sensors and putting them on the valve stems
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Old 04-25-2018, 05:09 PM   #50
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C'mon... you're not even the least bit curious about a new puzzle???
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Old 04-25-2018, 05:57 PM   #51
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C'mon... you're not even the least bit curious about a new puzzle???
Not curious: In a former life I wrote diagnostic software for an automaker (a four letter word LOL) so I know what I would be getting into . In addition, I think my SAE membership expired a while ago (at least I could get specs that way).
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Old 04-25-2018, 06:44 PM   #52
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So it sounds as if you know that mess that you might be getting into...
Smart!
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Old 04-25-2018, 09:31 PM   #53
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LOL Yep -40 it is.
Made me think of the trip I made to Calgary on business many years ago. It was in the winter so I figured I’d take my skis and and get a day or two in. I called Lake Louise ski area to find out what the temperature was and the lady said, “It’s not bad, only minus 10”. I was getting ready to not take the ski’s and pack an extra couple of coats when it occurred to me that Canada uses degrees C, so -10 wasn’t all that bad. Cold, but still above zero (F). Had a great day on a world class moutain - and caught a women’s World Cup downhill race by coincidence.
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Old 05-07-2018, 02:31 AM   #54
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Some example data: We had our first trip of the season this weekend and I had my app running recording data for each tire.

This file is the Right Front tire on our return trip home.
RFData.pdf

You can see in the data here that the PSI and temp gradually rises from the start of the trip (where it starts at 77PSI and 57F).
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Old 05-07-2018, 04:15 AM   #55
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That's interesting. Can you add MPH?
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Old 05-07-2018, 12:13 PM   #56
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That's interesting. Can you add MPH?
I'll have to check, I think I get a speed value from the GPS sensor library I'm using. That would be good info to store.

Edit: Found some excel formulas to calc approx mph from lat/lon points.
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Old 05-07-2018, 03:10 PM   #57
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With adding mph & outside temp. (Traveling in 40 degree compare to 95 degree) I think you just invented a Must Have App. $$$
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Old 05-07-2018, 03:30 PM   #58
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Air temp would also be a good contribution. We often start day in very low temps and end high. I do not think a 50 degree spread would be very unusual for a days drive. No way we can set pressure alarm at anything close to 15%. Even pavement makes a difference in tire pressure. Blacktop heated by the sun will produce higher tire temp/pressure than concrete as will sun shining on tires. Except for front tires I have found tire temp worthless. Our front aluminum wheels have short stems and the sensor is recessed and protected. Rear wheels have much more exposed valve stems and hoses with sensor and stem exposed to lots of moving air. Temps on our rears are probably pretty close actual air. This is a complex and very technical study. Looking forward to the progress reports and changes in thinking from start to finish. As a very old EET I respect the effort and time needed for such a project. Have Fun Jamie.
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Old 05-07-2018, 04:02 PM   #59
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Yeah these sensors are on the end of the valve stems to the temp they read won't be as high as the temps inside the tires, and with the windowflow over the front sensors..
hmm I should look at my front vs rear temp data...

LOL well the right front sensor got to as high as 95F and the right inside tire only got to 83F--I would suspect that this may be due to sunshine as the sensors are the little black things which would heat up in the sun. (Left front only heated up to 89F.)
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Old 02-24-2019, 09:28 PM   #60
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Great thread, I've read it all and still don't know what to use. Jamie, I can't believe how deep you went into this project, if I only had some knowledge and patience.
Jamie thanks for the posts
Bob Demon thanks for the laughs
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