Rav4.2 Milage Computer Information

[anchorman]

Yes yes, quite...........

[Hoovie]

I liked to think of myself as a part-time electrics/electronic geek, but I think I'm now heading to the bar with the others :P

[St Thicket]

For you people looking like a questionmark... A PIC controller is a small computer-on-a-chip that can be programmed to do whatever you like. You'll find microcontrollers everywhere, even in your coffeemashine if it's advanced enough...

[anchorman]

I liked to think of myself as a part-time electrics/electronic geek, but I think I'm now heading to the bar with the others :P

Smooth bitter please mate

[local hero]

I liked to think of myself as a part-time electrics/electronic geek, but I think I'm now heading to the bar with the others :P

Smooth bitter please mate

Pssst! Are any of these people coming to the motor show?.. :( :shutit:

[anchorman]

I liked to think of myself as a part-time electrics/electronic geek, but I think I'm now heading to the bar with the others :P

Smooth bitter please mate

Pssst! Are any of these people coming to the motor show?.. :( :!Removed!:

I suspect Norway is a bit far for a Fokker and an Airbus goes about 250mph too fast for Docklands but if shcm comes we'll just give him a printed circuit board with a fault to play with. Its the equivalent of giving bubble wrap to most people. However, we must not be disrespectful to our computer whizz as without him we are all flocked

Actually that Hoovie is worryingly clever at times so I think shcm should come just to balance things up!!! Oh but we've got Chatman coming and he is a software whizz.

Well Stew I can pull a gearbox apart and then fix it and I know you can make wooden 4X4's. Do you think we will be OK?

Another smooth bitter then!

[shcm]

I think a 16F628 will be sufficient.

Yep, it's not a bad little chip - I've used it a couple of times. No ADC of course for the sensor input, but not too difficult to implement a sigma-delta type ADC with the voltage ref and comparator modules.

Pssst! Are any of these people coming to the motor show?.. :( :shutit:

I'm sorry I/this bores you Stewart. I expect your comment was in jest but it is difficult to tell? St Thicket was, after all, asking for information to make a mod to his RAV and I was only trying to help. I thought that was at least one of the points of this forum? Perhaps I'm wrong?

On the other hand, nobody is forcing you to read this thread.

No, you're safe Stewart, I won't be coming to the motorshow. I'll never get out from under all that puke and smeg, dumped by Chatman and Kingo: ;)

Fuji. Thanks for that info, should I have my full English in Landon then rather than Manchester? I dont want to have to open the window at 15,000 feet and hurl the aforementioned on Birmingham............or should I???

I normally flush the Plane toilet over Birmingham... ;) ;)

That's a flocking (or should that be CLICK HERE) relief eh Stewart? :)

[Fujisan]

That's a flocking (or should that be CLICK HERE) relief eh Stewart? :)

I wonder if that is an external and INTERNAL polish?

[local hero]

Pssst! Are any of these people coming to the motor show?.. :( :shutit:

I'm sorry I/this bores you Stewart. I expect your comment was in jest but it is difficult to tell? St Thicket was, after all, asking for information to make a mod to his RAV and I was only trying to help. I thought that was at least one of the points of this forum? Perhaps I'm wrong?

On the other hand, nobody is forcing you to read this thread.

No, you're safe Stewart, I won't be coming to the motorshow. I'll never get out from under all that puke and smeg, dumped by Chatman and Kingo: ;)

My apologies SHCM, it is never my intention to slight anyone and 90% of what i post is rightly or wrongly done in jest, in my earlier reply to this topic i put..but for someone who only learned how to switch a computer on 6 months ago, this is far too much for me to understand, but good luck with it though..

and no i dont have to read this thread, nor do i have to watch university challenge, but i do so in the remote possibility that i may get a question right, again you are right about helping people on this forum, and on the rare occasion when i can help someone i will, and have! As to you coming to the motorshow, it would be as much a pleasure to see you there as it was to meet you at Warrington.. :) Stew

[St Thicket]

I think a 16F628 will be sufficient.

Yep, it's not a bad little chip - I've used it a couple of times. No ADC of course for the sensor input, but not too difficult to implement a sigma-delta type ADC with the voltage ref and comparator modules.

Nevermind... I thought it had an ADC... It's been a couple of years since I last messed around with the uC, that I forgot it doesn't have ADC. I'll probably step up to the 18F2550, which is quite advanced for my application. I could use the 16F877, but it requires external crystal, which I don't have.

With the 18F2550, I can add USB interface, so if I get a carputer in the future, it enables me to log the temperature! Now thats really geeky B)

Anyway, I've done som calculations on the thermistor, using the mean values for the termistor (which I believe is the most accurate). I Think the resistance at 25 degrees is 1700, and tried to find the beta value and the konstant. I found the beta value using the formula:

R(temp)=R(temp25)*B*exp(1/(temp)-1/(temp25)). I did this for all mean temperatures that was listed in your table, and then I calculated the mean B value. It was about 3900. Then I calculated the K, which i found to be 1/290.

Then i calculated the resistance for all temperatures from -10 to 60 degrees, and tried with different B values until the R25 became about 1700 ohms. Here's my result:

B 3903

K 0,0035088

Formula to find resistance at given temperature:

Rt=K*exp(B/T)

Where :

Rt=resistance at given temperature

B=beta constant

K=konstant

T=temperature in kelvin

°C	Kelvin		Calculated 	Mean 
			Rt		resistance	Error 

-10	263,15		9694,9				
-9	264,15		9165,5				
-8	265,15		8668,8				
-7	266,15		8202,3
-6	267,15		7764,2
-5	268,15		7352,5
-4	269,15		6965,5
-3	270,15		6601,4
-2	271,15		6258,9
-1	272,15		5936,5
0	273,15		5632,8
1	274,15		5346,7
2	275,15		5077,1
3	276,15		4822,9
4	277,15		4583,1
5	278,15		4356,9
6	279,15		4143,3
7	280,15		3941,6
8	281,15		3751,0
9	282,15		3570,9				
10	283,15		3400,7		3365		35.7
11	284,15		3239,6				
12	285,15		3087,3				
13	286,15		2943,1				
14	287,15		2806,5				
15	288,15		2677,2		2665		12.2
16	289,15		2554,7				
17	290,15		2438,6				
18	291,15		2328,5				
19	292,15		2224,1				
20	293,15		2125,0		2125		0
21	294,15		2030,9				
22	295,15		1941,7				
23	296,15		1856,9				
24	297,15		1776,3				
25	298,15		1699,8		1700		-0.2
26	299,15		1627,0				
27	300,15		1557,8				
28	301,15		1491,9				
29	302,15		1429,3				
30	303,15		1369,7		1375		-5.3
31	304,15		1312,9				
32	305,15		1258,8				
33	306,15		1207,3				
34	307,15		1158,2				
35	308,15		1111,4		1110		1.4
36	309,15		1066,8				
37	310,15		1024,3				
38	311,15		983,7				
39	312,15		944,9				
40	313,15		907,9		900		7.9
41	314,15		872,6				
42	315,15		838,9				
43	316,15		806,7				
44	317,15		775,9				
45	318,15		746,4		750		-3.6
46	319,15		718,3				
47	320,15		691,4				
48	321,15		665,6				
49	322,15		641,0				
50	323,15		617,4		600		17.4
51	324,15		594,8				
52	325,15		573,2				
53	326,15		552,5				
54	327,15		532,6				
55	328,15		513,6		520		-6.4
56	329,15		495,4				
57	330,15		477,9				
58	331,15		461,1				
59	332,15		445,1				
60	333,15		429,6		430		-0.4

As you can see, theres not much error compared to the mean resistance from the datasheet. If the temperature is wrong when i try this out, then I'll just alter the constant to make it correct again.

[St Thicket]

I've ordered a plug like this to be able to connect to my car without cutting any cables.

The plug itself was 7.50 GBP (calculated from NOK), and I had to buy the pins with leads for (hold tight) 6.50 each!

If I were to fully interconnect with 13 leads, then it would cost 92 pounds!!!

I just bough one lead, because that is what i need for now. If I nedd more, then I'll just buy a stereo-adapter for about 15 pounds and just pull the leads from it...

For reference:

The 18 pin plug has part number: 90980-10819

The pin with lead has part number: 82998-12340

[shcm]

I wonder if that is an external and INTERNAL polish?

Er, External, I can't possibly think why it should be internal :D

My apologies SHCM

No problem Stew! I think I also got out the wrong side of bed on Sunday morning. It's the heat, I blame the heat...... :)

As you can see, theres not much error compared to the mean resistance from the datasheet. If the temperature is wrong when i try this out, then I'll just alter the constant to make it correct again.

All looks reasonably valid to me - more than sufficient. good stuff I'm not 100% that the thermistor curve I found is exactly the one you want, but I don't think is is far off and if it isn't, it shouldn't be too much work to redo the exponential fitting.

You realise, you've also provided an insomnia cure for some (only some) of our TOC members ?

[St Thicket]

You realise, you've also provided an insomnia cure for some (only some) of our TOC members ?

Yeah, I noticed

[shcm]

For reference:

The 18 pin plug has part number: 90980-10819

The pin with lead has part number: 82998-12340

Did you go straight to Toyota for those or did you source them from a connector supplier and if so, which one?

Cheers

[St Thicket]

For reference:

The 18 pin plug has part number: 90980-10819

The pin with lead has part number: 82998-12340

Did you go straight to Toyota for those or did you source them from a connector supplier and if so, which one?

I contacted my local dealer, showd them the picture and said: Get me one of those :)

Why make it more complicated? B)

I tried to look around other places, but the connector is quite unique, so I my safest bet was my dealer.

[St Thicket]

I Talked to my dealer today, and they had ordered the exact same connector as the one installed in the car, no the one on the picture I sent them... bummer! :(

This means the part numbers in my posts above are incorrect. I'll try to look for the connector, but I don't know if it's worth the effort. I can just buy a standard stereo harness, and use the widest connector just by modifying it. You can see the resemblance here:

As I discovered, all the imporant connections are located in the middle section.

[rave]

I Talked to my dealer today, and they had ordered the exact same connector as the one installed in the car, no the one on the picture I sent them... bummer! :(

This means the part numbers in my posts above are incorrect. I'll try to look for the connector, but I don't know if it's worth the effort. I can just buy a standard stereo harness, and use the widest connector just by modifying it. You can see the resemblance here:

As I discovered, all the imporant connections are located in the middle section.

How is that project going?

[St Thicket]

I'm currently on vacation, som I'm obviously not progressing

I'm back in september, so I'll continue then. I might post a new thread with project status and etc.

[rave]

I'm currently on vacation, som I'm obviously not progressing

I'm back in september, so I'll continue then. I might post a new thread with project status and etc.

Maybe you can make a patent...and sold it where.... ;)

[St Thicket]

I've thought about it, but its too much hassle.

There's no money to make by doing it, so I think I'll rather release the result under GNU lisence or creative commons or whatever, so that everyone that want's to make it themselves can do it.

[Hoovie]

Not sure if you still need this info, but here goes anyway ........

The part numbers for the connectors that got INTO the radio unit are as follows:

18-Pin (R3) 90980-10817

12-Pin (R4) 90980-10803

10-Pin (R5) 90980-10997

6-Pin (R6) 90980-10996

8-Pin (R20) 90980-11533

[tblo163]

interesting stuff since after i sold all my kenwood gear i'm building my own ice / carpc. but i have a 2001 petrol and can use the obdii bus for this info. have a look at here may be you can get some useful info there.

Thx for the link. Doesn't help me much, since my diesel doesn't support obd2... i have an ELM327 for sale though... :-)

on that forum they NOT only talk / write about odbii interfaces... if you are a geek then you will search a bit more on that forum and find lots more info's

the same goes here what is more pointed to the uk.

[tblo163]

Most of the toyota cd radios with the trip milage function are made by Panasonic,I have fitted the toyota W58802 unit to my volvo,with the help of a comprehensive wiring diagram downloaded FREE from Panasonic,this diagram shows all the components on the circuit board & their values,Go to the panasonic site and search their list of ref,numbers,mine wasCQTS7170L it took me straight to it,I have downloaded it,and have saved it for future ref;I you have any problems finding this site let me know,I will retrace my steps to find it good luck Terry

[tblo163]

Most of the toyota cd radios with the trip milage function are made by Panasonic,I have fitted the toyota W58802 unit to my volvo,with the help of a comprehensive wiring diagram downloaded FREE from Panasonic,this diagram shows all the components on the circuit board & their values,Go to the panasonic site and search their list of ref,numbers,mine wasCQTS7170L it took me straight to it,I have downloaded it,and have saved it for future ref;I you have any problems finding this site let me know,I will retrace my steps to find it good luck Terry

[Hoovie]

Tried going on panasonic.com and co.uk, also googling this and no joy. any clues on where to find?

I did find a couple of sites that were selling manuals for the CQ-TS7170L but none that provided a free download