Custom USB tyre pressure monitoring interface

**wiggy** · 07-14-2008, 01:27 PM

Have tryed both of these ..centrafuse and RRTMS Config out of the RR file

Also using TPMS DOCTOR to do a master reset..although sometimes it takes 2 or 3 goes to clear the pic !!

**a__l** · 07-15-2008, 01:47 AM

Originally Posted by Robby BMW;

The transistor has the dual function to invert the signal and bring it to 5V, as the output from the receiver is about 3.8V.

Robby, Thanks for the answer :-) In case of WAECO the output from the receiver is also about 3-4V but my micro controller (Atmel MEGA) recognizes 0 and 1 in the input. Does the PICs can't recognize 1 within 3.8V in the input? (I mean, might be I can put away this part from my realization).

**Robby BMW** · 07-16-2008, 12:37 PM

Originally Posted by wiggy

Have tryed both of these ..centrafuse and RRTMS Config out of the RR file

Also using TPMS DOCTOR to do a master reset..although sometimes it takes 2 or 3 goes to clear the pic !!

Ok, try this:
Do a master reset to the PIC with TPMS DOCTOR, then perform the learnig procedure trough RRTMS Config taking care to place the receiver at least 1 meter from the tyres and to wait at least 1minute between a tire and the other.

**Robby BMW** · 07-16-2008, 12:40 PM

Originally Posted by a__l

Robby, Thanks for the answer :-) In case of WAECO the output from the receiver is also about 3-4V but my micro controller (Atmel MEGA) recognizes 0 and 1 in the input. Does the PICs can't recognize 1 within 3.8V in the input? (I mean, might be I can put away this part from my realization).

Maybe, but for safety I put the transistor which also operates as a sort of Schmitt trigger.

**a__l** · 07-17-2008, 02:12 AM

Originally Posted by Robby BMW

Maybe, but for safety I put the transistor which also operates as a sort of Schmitt trigger.

For safety just to make sure that the voltage will not more that 5V (safe for PIC input)? Is it correct?

**Robby BMW** · 07-17-2008, 04:27 AM

Not exactly, since the receiver is powered by the same voltage of the PIC (5V), it is impossible to get an output level over 5V.

**a__l** · 07-17-2008, 10:16 AM

Originally Posted by Robby BMW

Not exactly, since the receiver is powered by the same voltage of the PIC (5V), it is impossible to get an output level over 5V.

Yes... agree :-) (my assumption was wrong) .... nevertheless what kind of "safety" did you mean?

(Managed to get data from WAECO system .... thanks for your answers)

**Robby BMW** · 07-19-2008, 10:15 AM

I should have had to say "just to be sure"... just to be sure to get a good signal.
My bad... in Italian "for safety" can also mean "just to be sure".

**GizmoQ** · 07-19-2008, 10:09 PM

Originally Posted by LYHTSPD

I do not have any of the 3rd Eye kits left, but I do have several of the USB converters left. They are complete with Robby's PIC, case, and USB cable. PM me if you are interested.

Thanks to LYHTSPD, RRFusion and RRTMS, I now have my fusion brain/TMS skin fully operational. Now I just need to buy and install the sensors and receiver.

**goosey2099** · 07-19-2008, 10:39 PM

I'm having a littlebit of an issue here. It seems that if i place the receiver within that 1m from the tire then the RRTMS Config learns the sensor. But if i keep the receiver in the middle of the car I have no connection to any tire. This is really starting to drive me insane as it allmost looks like there is not enough power comming into the receiver. Also I have this plugged into a 8port usb hub and all 8 ports are being used for something. Can anyone shed some light on this issue?