(ECT and VSS work!) Yet another s2000 cauge project [READY]

Post by **nate** » Fri Aug 15, 2008 3:06 pm

Nice! Once it's done and 100% you're gonna make me one right? lol

Orthello · Post by **Orthello** » Fri Aug 15, 2008 3:31 pm

As I said... my hands were itching.... so I have the ECT 100% working since last night

The only thing I can offer you Nate, are the specs of the signals.

ge0ne · Post by **ge0ne** » Sun Aug 17, 2008 5:27 am

So no one will be making one and sell???

Orthello · Post by **Orthello** » Sun Aug 17, 2008 8:52 am

I'm not sure yet. Modifry and Mark Lamond also offer converter services. My convertor does not have as much functionality as the one of modifry and Mark. I'll think about it, but at this moment I'm not planning any production or service activities. But I'm still willing to provide all the specs of the ECT and VSS signals.

HRTuning · Post by **HRTuning** » Sun Aug 17, 2008 3:17 pm

Production of something like this would be fairly easy.

Orthello · Post by **Orthello** » Mon Aug 18, 2008 4:00 am

True. Production is simple. But it's not only the production. If I sell something I also need to provide some sort of support and aftersales. I don't have the time to awnser questions over and over again.

HiProfile · Post by **HiProfile** » Mon Aug 18, 2008 10:14 pm

Thats why you sell the information only. (or post it plainly if you're not greedy like us

) The key is to cover all your bases, make it a DIY deal, and tell them how it is - no support. THe ones who get it will make units for those who don't. Thats how the world usually works.

JaredKaragen · Post by **JaredKaragen** » Tue Aug 19, 2008 2:52 am

Orthello; I am interested; I would love to put an S2k cluster in my EJ1, and my father is an electrical engineer for Cisco systems... so I can probably get a board and well sourced components easily =) When I get a cluster and get boards etched I will provide the specs/schematics/.brd open source if you wish

My email is: my username (at) gmail. com

Orthello · Post by **Orthello** » Tue Aug 19, 2008 4:16 am

Well... Let's go with the signal specs... VSS and ECT are both 0~5v digital signals. High is 5v, low is 0 volt. S2000 VSS is 39 times faster then the older VSS signals. So take a upic or AVR. Use a timer and an external interrupt to measure the pulse width of the incomming pulses. Then devide the measured pulsewidth by 39 and us that to produce a new pulse output to the S2000 VSS input with the internal PWM module set at 50% duty cycle and the desired frequency. Use the internal PWM module. This saves you procesor time, as it keeps working on the background and the best part of that... it gives a very stable reading on the gauge. Don't forget to program something for the first and the last (stop the PWM) incoming pulse! ECT is a PWM-ish signal. The 'high' part of the pulse is always 30ms. The low part changes with the temperature. ALWAYS use the ECT signal which is provided to the ECU. Don't use the signal of the original gauge. That signal is just an indicator and not accurate enough the drive 'inteligent' electronics!! I created a table with transistion points for the 7 segment AP1 ECT gauge. Unfortunatly I don't have an AP2, so I don't know the transistion points of that one. Use an upic or AVR with an ADC module. Measure the analoge voltage of the ECT sensor. create a lookup table to decide how many segments should be lit. And produce the desired signal based on that table (see below) During development I worked with a 16F877A upic. For the real converter I decided to have the ECT and VSS work independant from eachother. There are a few reasons for that. 1) it keeps the programes simple and small (less then 50 lines of code) 2) a big 40 pins upic is a real overkill for this simple job and... because I'm from Holland....

3) it's cheaper the have two small upics instead of a big one For VSS I use the 16F628A. This is a dip18 upic with a PWM module and external interrupts (RB0) For ECT I use the 12F675. This is a dip8 upic with an ADC inside These two together are cheaper and smaller then the big big big 16F877A. But the big mamma is very handy for development though.

Code: Select all

    high, low  1 bar &#40;always on&#41;    30ms, 1197ms  2 bars    30ms, 1034ms  3 bars    30ms, 553ms  4 bars    30ms, 368ms  5 bars    30ms, 274ms  6 bars    30ms, 182ms  7 bars &#40;red&#41;

This is all you need to know about the signals. Now you need to decide for yourself which temperature should lit 2,3,4,5,6 or 7 segments. Hopefully this will help the DIY guys here

Blue: OEM S2000 segments Red : Modifry/Orthello S2000 segments Black: ECT temp (F) vs. voltage (V)

HRTuning · Post by **HRTuning** » Tue Aug 19, 2008 3:17 pm

Thanks for the specs and info.

If Jared is going to put this out, then I won't worry about doing it, but it seems like something more and more people need. I'll keep my eye on what happens here.

Orthello · Post by **Orthello** » Tue Aug 19, 2008 3:32 pm

Feel free to do a PayPal donation to ronald[at]ronsoft[dot]nl

JaredKaragen · Post by **JaredKaragen** » Wed Aug 20, 2008 12:47 am

Orthello wrote:Feel free to do a PayPal donation to ronald[at]ronsoft[dot]nl

As soon as I got cash in hand, expect a payment and PM

Up untill this point everyone who has done the legwork has not shared... About a year ago I gave up and never bought my S2k cluster cause of this.

ge0ne · Post by **ge0ne** » Thu Aug 21, 2008 4:39 pm

I want a module for the S2K cluster to work in EG and i don't care about support, as long as i have the converter in hand i can work all the problems out myself... It is for my car not a customers.... So i am free to experiment...

Post by **nate** » Thu Aug 21, 2008 8:53 pm

ge0ne wrote:I want a module for the S2K cluster to work in EG and i don't care about support, as long as i have the converter in hand i can work all the problems out myself... It is for my car not a customers.... So i am free to experiment...

Same here

JaredKaragen · Post by **JaredKaragen** » Fri Aug 22, 2008 3:11 am

Well; I will probably be able to come up with some sort of SMT board and solution... need to get a cluster first then away I go