Looks like the receiver board from the third eye just spits out the raw data, and robby's PIC decodes it..
Which means we buy the TDA5200's, build the board and robbys circuit, and then order $100 worth of in-wheel sensors =] There! We've already cut costs in half!
I would much rather see a home-grown solution anyway. The problem with taking the pre-built unit and hacking it is that makes you dependant on the manufacture and supplier of the other unit. Plus, you are buying a $250 item and not using half of it.
I mentioned earlier that I can get a hold of a couple of different TPMS reciever units. I can get an 08 Honda, 08+ Kia, and a few others. Robby, if you want me to send you some of them, just let me know. This may help in developing our own version of this thing.
Well if some 1 can get me the whole working module/kit at a reasonable price i would like to have 1 as well pls
what I think would be sweet would be if you were able to do robbies interface & still have the display too, is this possible? tap into the data instead of diverting the data?
just curious, def not a deal breaker, but that would be cool to for some installs I think...
Exactly :) That's why I want to do it this way, it would help in saving costs...Quote:
Originally Posted by inh
From an electronic perspective this would be easy, as you can intercept the datastream where it heads into the factory decoder pic, and divert it to Robby's solution......then you have the best of both worlds.Quote:
Originally Posted by turbocad6
Thanx Robby, I could actually read the code of one of your pictures, the TDA5200 part that is.Quote:
Originally Posted by robbybmw
I know the 16C926 fairly well as an integrated LCD driver pic, so they must use the 16C621A for decoding then.
Well, this really confirms then that we need to find TPMS receivers running 433.92Mhz, making use of FSK - so it narrows the field down a lot.....even the 315Mhz USA version receivers should work just fiine - generally 433.92Mhz is used in the EU, and 315Mhz receivers in the USA.
Just something to look at for, but it is generally just a case of changing the onboard crystal oscillator to a different speed rating, and maybe changing the 64x or 128x freq multiplier on the chip to either ground or floating....
Well, I will do some reading on this on the weekend, and notify you guys of anything interesting.
Being a digital stream it should be ok, it is the same as if sitting ontop a RS-comms link and snooping data, or, for a better example, consider a standard ethernet netowork :)
The data is available to anyone, but only those that needs to respond will.....so, in this case, you send the data down the link, and whoever is "authorized" to listen can.....
Viva TPMS update:
If anyone would like to order the kit right now, you can use coupon code "3RDEYE10%" to receive an instant 10% off.
Charges will be adjusted depending upon how many end up purchasing the TPMS, meaning the more orders, the higher the discount (max discount = 25%)!
cool, I just ordered mine :D
robbies gonna send me the pic, now I just gotta figure out how to get a board made, this is a really cool setup...