Custom USB tyre pressure monitoring interface - Page 49

mrbean_phillip · 08-09-2008, 11:18 AM

Hey Robby,
Thanx, will test tomorrow!

Will notify you of the results

Kind regards,
MrBean

Dj-[NRG] · 08-10-2008, 09:36 AM

I tried to pair my sensors today using the new software (tpms doctor 1.3 and rrtms) but with no success...

just to be sure i did nothing wrong, here's what i did:

- closed CF
- opened tpms doctor and did a master reset (however, is it normal that when i press "master reset" it does not give me a notification that the reset succeeded?)
- opened rrtms
- clicked on my front left tire
- deflated the tire with 0.5 bar
- waited 30 sec

nothing happened

all i could do was press "abort" or wait longer (however i was at a public gasstation and there were other people waiting to check their tires :s )
so how long does it normally take to detect the tire once it is deflated?
anything else i did wrong?

Greetz

Dj NRG

Robby BMW · 08-11-2008, 09:49 AM

Quote: Originally Posted by Dj-[NRG]

I tried to pair my sensors today using the new software (tpms doctor 1.3 and rrtms) but with no success...

just to be sure i did nothing wrong, here's what i did:

- closed CF
- opened tpms doctor and did a master reset (however, is it normal that when i press "master reset" it does not give me a notification that the reset succeeded?)
- opened rrtms
- clicked on my front left tire
- deflated the tire with 0.5 bar
- waited 30 sec

nothing happened

all i could do was press "abort" or wait longer (however i was at a public gasstation and there were other people waiting to check their tires :s )
so how long does it normally take to detect the tire once it is deflated?
anything else i did wrong?

Greetz

Dj NRG

Normally it take betwen 10 and 40 seconds, depends on how much and how fast you deflate the tire.
Are you sure it is not just a problem of poor RF reception?
Where do you have placed the interface with the receiver?
In my car I had to place the receiver near the windshield, behind the rear-view mirror in order to get a good reception.
Also an external antenna could be helpful.

Dj-[NRG] · 08-11-2008, 10:00 AM

I will try again with receiver on other places and wait longer when inflating /deflating the tire.

I'll let you know if it works

Greetz

Dj NRG

DigitalVampire · 08-11-2008, 10:50 AM

Quote: Originally Posted by Robby BMW

Normally it take betwen 10 and 40 seconds, depends on how much and how fast you deflate the tire.

Does this mean that it takes a minimum of 10 seconds for the change in pressure to be detected by the TPMS?

Is this the 3rd Eye kit's limitation? I'm curious since I've seen OEM systems responding much faster.

bes51659 · 08-12-2008, 05:39 AM

When I did the learning yesterday I could keep an eye on the screen at the same time as I releaseed preasure with a tooth-pick.

My feeling for timing was that it was pretty much instantanious. But then I had the receiver on the floor next to the tire...

I did not notice any lag. Waiting did not help. If tmps config did not detect the sensor I had to reduce pressure even more.

btw. Could maybe the size of the tpmsdoctor and the config app be reduced to fit 480x800, please?

Robby BMW · 08-16-2008, 05:13 AM

Quote: Originally Posted by DigitalVampire

Does this mean that it takes a minimum of 10 seconds for the change in pressure to be detected by the TPMS?

Is this the 3rd Eye kit's limitation? I'm curious since I've seen OEM systems responding much faster.

The interface adquires the data in real time, the delay is due to the PC software that does a data request every 10 seconds.
I have chosen a time of 10 seconds in order to not overload the slowest systems, but it can be easly changed by recompiling the plugin with a different data pooling time.

DigitalVampire · 08-16-2008, 09:11 AM

Quote: Originally Posted by Robby BMW

The interface adquires the data in real time, the delay is due to the PC software that does a data request every 10 seconds.
I have chosen a time of 10 seconds in order to not overload the slowest systems, but it can be easly changed by recompiling the plugin with a different data pooling time.

Thanks for the explanation Robby...

It would be great if the polling time is configurable by the end user. A rapid decline is tire pressure should be an important situation to know as fast as possible.

Or

Is it feasible to make this interrupt driven rather than 10 second polling? ie, If any parameters (pressure, temperature, battery) change, the interface should send an interrupt to the PC application over USB and then the SW reads the PIC registers to update the values on screen.

I confess that my awareness of USB protocol is very less and I'm not even sure whether the interrupt mechanism is possible over USB since it is only a differential data bus with no control lines. I'd imagine a soft interrupt mechanism would exist for USB.

WuNgUn · 08-16-2008, 09:16 AM

Are you certain your TPMS is even working at all? Maybe it got wrecked during the cutting/soldering?

Robby BMW · 08-19-2008, 07:26 AM

Quote: Originally Posted by DigitalVampire

Thanks for the explanation Robby...

It would be great if the polling time is configurable by the end user. A rapid decline is tire pressure should be an important situation to know as fast as possible.

Or

Is it feasible to make this interrupt driven rather than 10 second polling? ie, If any parameters (pressure, temperature, battery) change, the interface should send an interrupt to the PC application over USB and then the SW reads the PIC registers to update the values on screen.

I confess that my awareness of USB protocol is very less and I'm not even sure whether the interrupt mechanism is possible over USB since it is only a differential data bus with no control lines. I'd imagine a soft interrupt mechanism would exist for USB.

I don't think the interupt way is practicable, but I can certainly make the polling time configurable by the end user.
I will take it in consideration for the next release.

Dj-[NRG] · 08-19-2008, 04:01 PM

Hey Robby,

i tried to pair again, waiting longer and putting the receiver closer to my tires (+- 40cm), however, i was still unable to pair em...

i guess the only thing left i can do is make that antenna thing?

Greetz

Dj NRG

amiganut · 08-19-2008, 06:25 PM

Hello all,

I've been following this thread from the moment I found it and I have a couple of questions.

1: would it be possible to have a SMD PIC instead of the through mount version?
2: is the waeco set compatible and if so what are the connections that need to be made?

I want to make my own PCB but as I don't have a PCB driling tool I would like to make a full SMD PCB, and just to save me some money I would rather buy the waeco set than the 3rd eye one.

Gerard

Robby BMW · 08-20-2008, 09:15 AM

Quote: Originally Posted by Dj-[NRG]

Hey Robby,

i tried to pair again, waiting longer and putting the receiver closer to my tires (+- 40cm), however, i was still unable to pair em...

i guess the only thing left i can do is make that antenna thing?

Greetz

Dj NRG

It's really strange that even one sensor is not been coupled, it sounds like your receiver doesn't work or has some problem.
If you wish, I can check your interface, please send me a PM.

f1racr · 08-26-2008, 12:17 AM

Robbie, I'm hoping you can help me out.

I've got some boards and your PIC's from LYTSPEED and recently got my 3RD Eye kits and put them all in place, but I'm not sure on what I should be seeing.

I've downloaded your TPMS Doctor and it seems to see the sensors, but I can't really tell.

I've put one of the sensors into a small sprayer so I can pump it up to simulate pressure in the tyre as I don't want to mount it on the car yet.

1 of the sensors shows 1.8psi, the other 3 show - .4psi which in itself is interesting since that means they're in vacuum, but it's so small I'm not worried.

When I try and run the TPMS config tool and select pair, then pump up the sensor, nothing happens........... I don't know why one sensor shows higher than the others.

Only thing I can think of is that when I was soldering the boards in place, there was a resistor I think in the place where one of the pins from the PCB needed to be soldered. I'm not sure if I need to solder on one side or the other side of this resistor, I'll show a picture below........

Can you tell me the best process I can go through to test my sensors.

I have 3 kits in total, 3 USB interfaces and 12 sensors to sort out.

_Dejan_ · 08-26-2008, 03:45 AM

1.) Do you use latest TPMS doctor and learning tool?

2.) Did you try clear data?

3.)Try learn sensor which show you 1.8psi to other location. Maybe is sensor defect...

4.) About resistor, If I remember I have connection trough resistor but Im not shure, I think here in this thread are Robby say if is important to make connection on both side of resistor. Maybe if you quick check pages you will find this...

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