[Diy_efi] Microcontroller based Auto Related Projects

Wed Oct 31 17:51:03 UTC 2012

I would stay away from the ARM based Arduino for maybe another year or
two. Let the software/hardware settle down a bit.
The 8bit AVR's on Arduinos have a simpler interrupt system.  Your
probably going to have to do most of the interrupt stuff by hand
anyway. Specifically the system timer.  The Arduino software hides
this from the user so it makes it hard to get really precise or just
bend it to your needs.  Writing up a board support package is much
simpler for 8bit AVR than it is for nearly any ARM. And what you learn
from it can be applied to your future ARM BSP.

If you want to look at whats involved in an ARM BSP check out this set
of articles http://www.state-machine.com/arm/Building_bare-metal_ARM_with_GNU.pdf

-Avery

On Wed, Oct 31, 2012 at 9:51 AM, Fred Cooke <fred.cooke at gmail.com> wrote:
> If you want something freescale, have a look at www.technologicalarts.ca
> they have some nice boards, not particularly cheap in these spoiled days,
> though.
>
>
> On Wed, Oct 31, 2012 at 5:41 PM, Aaron <aaron at creativeoverdrive.com> wrote:
>> 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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>>> Diy_efi at diy-efi.org
>>> http://lists.diy-efi.org/mailman/listinfo/diy_efi
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