[Diy_efi] Microcontroller based Auto Related Projects

Wed Oct 31 16:41:11 UTC 2012

Crap !

I meant Uninitiated!

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Aaron
Sent: Wednesday, October 31, 2012 12:32 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Microcontroller based Auto Related Projects

What automotive grade microprocessor / hobby board would you recommend for
the ininitiated?

Arduino, PIC, Basic Stamp, Freescale Evaluation Board like the
KIT33812ECUEVME?

From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Bill Shaw
Sent: Wednesday, October 31, 2012 8:41 AM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Microcontroller based Auto Related Projects

The operating voltage is not a significant decision factor when choosing an
automotive microprocessor.? The MPC5554 we are using has a 1.3 volt core and
3.3 volt I/O.? It is an awesome? automotive microprocessor,? but the array
of peripherals and registers would be a bit daunting for the uninitiated.

Best,

Bill
On 10/31/2012 12:16 AM, Alan To wrote:
It is a 3.3v chip and you really want 5v operation for automotive. The new
Arduino Due will be a trainwreck, an epic one.

On 10/30/2012 6:47 PM, xyz Q wrote:
There's an ARM based Arduino. What would you say about that for a choice?
On Oct 31, 2012 1:22 PM, "Avery Nisbet" <anisbet at gmail.com> wrote:
1. ?Most of the hack a day projects are by IT/computer sci guys that look
down on getting their hands dirty with cars. If you look deeply at some of
the projects they will have really shoty electrical engineering in them.
Some of them are pure hacks and would not work in a production sense. ?Some
are pretty decent.

2. Pics from an architecture point of view kinda suck. They were not
designed for use with stack based compilers(One working register).
The Motorola stuff was some of the 1st used in the automotive space.
The architecture lends itself to use with a compiler. ?They are designed for
the harsher automotive environment. ?Some will say they have nicer hardware
peripherals. ?I would say some of the peripherals were designed specifically
for the automotive market. There is also a pretty big code base to look at.
?Oh and mostly anyone who went to school for software or hardware who is
older than say 30 was forced to learn 6800(68HC11) or 68000 assembly
language. ?This usually involved getting ahold of the purple data books
motorola gave away for free that were well enough written so you could get
your class work or real work done. I probably have 2 or 3 copies of the
68HC11 books laying around somewhere. This being said there are many other
options today and I would look to ARM or AVR before I looked at PIC. ?ARM is
already dominating the cheap 32bit market and is pretty easy to pick up.
This will help in the job search later. AVR's are pretty good for the 8bit
scene. ?GCC supports them and ATMEL makes some automotive environment parts.

3. ?Go get yourself an Arduino(or other uC of choice), BIP373(OR GM ignition
module) and some optoisolators. ?Then build a distributor and/or crank
trigger based ignition system. Then try turning that into a full engine
management solution using the peak and hold add in board by Jbperf. Start
researching the mega squirt schematics at the timing
input(tach) and the ignition output. Build those circuite on a bread board
and test on a bench. Then move them on to your test engine. It could be a
lawn mower engine or a V8 monster. Read up on timing advance and program the
Arduino to do a simple RPM only based timing curve. ?Then add a MAP and/or
TPS sensors and add load as a factor of your timing curve. ?Then engine temp
to add some cold start advantages and you have all the sensors needed to do
open loop EFI. ?After adding injectors you could add a wide band O2 sensor
such as the LC-1 from innovative motor sports or just a heated narrow band
for cruze.

-Avery

On Mon, Oct 29, 2012 at 8:13 PM, xyz Q <xyzqhtc at gmail.com> wrote:
> Hi, I've been on the list for some time, on and off mainly reading 
> bits, trying to find some interesting ideas. Unfortunately I was 10 
> years too late, when this forum had been in its prime.
>
> So here are my first set of questions that I hope on getting some 
> answers, hopefully.
>
> 1. Why are there so little auto related uc based projects and ideas 
> out there on the net? Look at hackaday.com, for example. Many 
> projects,
talented
> people but all they do is prove a point that some thing can be done. 
> But guess what hardly something is really useful. I may have missed 
> some good worth while so please put them here if you know.
>
> 2. If PICs are so popular, why are Motorola MCUs popular with auto
projects?
> In terms of features aren't they on the same "level"?
>
> 3. The way I see to learn microcontroller based EMS or ignition is to 
> look at it piece by piece. Megasquirt is great but it's hard to learn 
> a
complete
> system. Aren't there any web sites (I've seen DIYEFI) that have info 
> on
say
> ignition control, RPM handling with an MCU or other basic control 
> concepts that can form the basis for EMS/Ign. related projects. I'd 
> like to learn
the
> basics and if there are specific approaches to this, I'd like to hear 
> your side of the story. It would be helpful.
>
> Thanks and regards to all on the forum. Some projects here are really 
> nice and inspiring.
>
> Nik.
>
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