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07-23-2009, 12:10 PM
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#1021
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Low Bitrate
Join Date: Feb 2008
Posts: 67
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i will lok im hoping to use the same logic analyzer program to get enough samples to enable you or robbie to figure out how to implement it into some universal format.
Az1324 at the end of the day your still going to need a programmed chip it handles the learning sensors etc.
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07-23-2009, 02:40 PM
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#1022
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VENDOR - Portal Media
Join Date: Feb 2008
Posts: 141
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Az1324 I think you are hoping for a bit too much. These receivers are being built in runs of 100 boards, there is simply not enough volume to reduce the costs to that point. If I could make a run of 1000 boards the cost of the kit would easily be less than $150.
@ Xargon, i think Ax1324 is right, you won't need the PIC chip as the protocol is probably completely different. The learning process may even differ significantly. You need to get a logic analyzer and see what kind of communication is going on in your exisiting TPMS system, chances are you may need to tap into your actual TPMS electronics and see the 1's and 0's that are being transmitted on the frequency. You may not be happy with how your car looks at the end...
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07-23-2009, 03:01 PM
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#1023
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Variable Bitrate
Join Date: Sep 2000
Location: LA, CA, USA
Posts: 442
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Quote: Originally Posted by Lok  Az1324 I think you are hoping for a bit too much. These receivers are being built in runs of 100 boards, there is simply not enough volume to reduce the costs to that point. If I could make a run of 1000 boards the cost of the kit would easily be less than $150.
Even at 100 qty parts costs should be <$25. It's just that expensive automated assembly line driving up the costs.
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07-23-2009, 04:08 PM
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#1024
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Low Bitrate
Join Date: Feb 2008
Posts: 67
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i am aware that the programming for the tpms system will likely be very different but i cant tap into my cars setup with out delving into the dash and i drive the car daily im hoping that i can use the reciver setup to capture the data packets sent by the sensors to see see if we can decode them. the main problem for me is that the tpms system is built into a smart junction box on my car that handles all the communications traffic for the car.
im using you setup as i just need a platform that i know is working and powered, i am going to use a laptop and the logic analyzer program that robbie found to see if i can capture the data packets just to see where it can go. this is just my idle tinkering and im not expecting much out of it. my programming skill are not the greatest so i would probable send you and/or robbie the data so you can have a look at it
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07-23-2009, 04:34 PM
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#1025
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VENDOR - Portal Media
Join Date: Feb 2008
Posts: 141
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Quote: Originally Posted by az1324 Even at 100 qty parts costs should be <$25. It's just that expensive automated assembly line driving up the costs.
Are you suggesting that placing the components by hand is cheaper? If that were the case then whats the point of automated machinery? why not do everything by hand? Parts actually cost much more than $25, I can tell you because I have made the bill of materials. Also parts are not the only costs associated with the device (labor, development, support, packaging, advertising). Even after the product has left my facility I still have to provide support in case there are issues or people need help getting software installed. Also I am not sure if you know this but my parent company is a Contract Electronic Manufacturer so I am getting the boards manufactured with internal pricing, I don't think you will find too many developers in the Car PC industry with the kind of resources I have. I operate out of the US so I can't pay my employees 50 cents an hour like they do in China.
Last edited by Lok; 07-23-2009 at 04:42 PM.
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07-23-2009, 05:48 PM
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#1026
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FLAC
Join Date: Sep 2007
Posts: 1,200
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Quote: Originally Posted by Lok Do you have the LED version of the board??? If so then there are two LED's on the device, one should remain on once the USB link has been established and the other should blink every time you recieve a new packet.
Red is on when plugged in...red flashes when new data arrives. Haven't seen the green LED do anything yet! 
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07-23-2009, 07:21 PM
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#1027
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Variable Bitrate
Join Date: Sep 2000
Location: LA, CA, USA
Posts: 442
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Quote: Originally Posted by Lok Are you suggesting that placing the components by hand is cheaper? If that were the case then whats the point of automated machinery? why not do everything by hand? Parts actually cost much more than $25, I can tell you because I have made the bill of materials. Also parts are not the only costs associated with the device (labor, development, support, packaging, advertising). Even after the product has left my facility I still have to provide support in case there are issues or people need help getting software installed. Also I am not sure if you know this but my parent company is a Contract Electronic Manufacturer so I am getting the boards manufactured with internal pricing, I don't think you will find too many developers in the Car PC industry with the kind of resources I have. I operate out of the US so I can't pay my employees 50 cents an hour like they do in China.
Obviously automated is better but usually involves high setup costs so small runs are hard to justify.
I'm not trying to imply that you are adding unreasonable markups I am simply saying it would be possible to get the receivers made and distributed much more cheaply if different choices were made. Personally I would be happy with a $30 unassembled receiver kit and no tech support but that's just me. I think plenty of people are happy with what you are offering.
Last edited by az1324; 07-23-2009 at 07:24 PM.
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07-24-2009, 09:56 AM
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#1028
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VENDOR - Portal Media
Join Date: Feb 2008
Posts: 141
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Quote: Originally Posted by WuNgUn Red is on when plugged in...red flashes when new data arrives. Haven't seen the green LED do anything yet!
I belive Robby may have made the changes to the latest firmware which only required 1 LED as opposed to two. Let me do some testing with a new board and get back to you.
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07-26-2009, 04:12 PM
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#1029
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FLAC
Join Date: Sep 2007
Posts: 1,200
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I've also had strange data readings...
I don't think my front 2 wheels have updated since I 'learned' them...I've gotten new data from the rear, but it never updates regularily.
Actually, I recieved data on the front right once...but that's it.
Could it be the reciever is too CLOSE to the front? It's mounted INSIDE the center of the dash, behind the touchscreen...
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07-27-2009, 08:35 AM
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#1030
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Maximum Bitrate
Join Date: Aug 2005
Location: Italy
Posts: 558
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Maybe the touchscreen generates a kind of interference that prevents the reception of the sensors.
__________________
_______________________________________
Car installation 95% [ ■■■■■■■■■■■■■■■■■■■■]
Current project: Parking sensor USB interface
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07-27-2009, 09:23 AM
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#1031
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Confusion Master
Join Date: Sep 2003
Location: If you go down to the woods today, You're sure of
Posts: 11,928
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Quote: Originally Posted by Robby BMW Maybe the touchscreen generates a kind of interference that prevents the reception of the sensors.
Very likely.
I have found it already affects my remote central locking.
For a while I had my screen powered off the PC and it stayed when the key was out of the ignition. The range dropped to about 10 inches (25cm) above my bonnet.
Now the screen is back to being switched from the ACC so as soon as the key is out the screen goes off. Now the Remote works as normal from across the street.
Get some shielding on that/those screens.
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07-28-2009, 07:56 PM
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#1032
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Constant Bitrate
Join Date: Apr 2008
Posts: 192
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Quote: Originally Posted by Enforcer Very likely.
I have found it already affects my remote central locking.
For a while I had my screen powered off the PC and it stayed when the key was out of the ignition. The range dropped to about 10 inches (25cm) above my bonnet.
Now the screen is back to being switched from the ACC so as soon as the key is out the screen goes off. Now the Remote works as normal from across the street.
Get some shielding on that/those screens.
dude! that's why! i thought my key fob battery was dying. now it works again, and "coincidentally" after i had my touchscreen switched to ACC as well.
hmm, when i moved my TPMS receiver box further back away from the touchscreen closer to my 4th sensor, it started refreshing again, though sometimes it still gets stuck with old data especially when my kids are loaded up in the back. maybe my baby boy emits some sorta of interference with his cries?
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08-01-2009, 03:18 PM
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#1033
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FLAC
Join Date: Sep 2007
Posts: 1,200
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Well, I went out and bought a 6ft USB extension...I put the TPMS reciever behind the sunroof motor access door (basically, center-forward ceiling), and it's picking up the sensors and updating regularly now...Weeee!!!!
But I think left rear is still a BIT distant, as it was the slowest to update.
All-in-all, a much better setup!!
Thanks for the help guys!
BTW, when it was in my dash, and struggling to read the RF data, I got problems with the plugin again...sluggish CF respones, and the occassional freezing.
Seems better in this respect now, however...
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08-01-2009, 04:57 PM
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#1034
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Constant Bitrate
Join Date: Jul 2006
Posts: 113
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where can i get TPMS doctor software?
I checked the whole site, but can't find download links anywhere.
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08-01-2009, 05:08 PM
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#1035
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Constant Bitrate
Join Date: Jul 2006
Posts: 113
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hahaha...stupid me...i searched the wrong area.
Never mind. 
Anyway if anyone else wants to know.
Here is what looks like the official release.
Info and download for TPMS Doctor v1.3 (at time of this post)
http://www.mp3car.com/vbulletin/port...ml#post1171817
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