flat4power's Guepard - a VW type 1 oriented board

A home for new designs that are growing but haven't quite got their legs yet!
User avatar
Fred
Moderator
Posts: 15431
Joined: Tue Jan 15, 2008 2:31 pm
Location: Home sweet home!
Contact:

Re: Guepard board

Post by Fred »

See, now that you've been specific about this, I can point out that the ground path for those ICs, in our application, is virtually unused. Much like the 12V path on the injector FETs. Do you see it? That's because there is absolutely no current in that case, the flow is from ground in, to ground out. For the ignition IC it's from 12V or 5V in to the same out. Ground isn't really involved, except to reference the input signal.

The general point is good, of course, however it's useless, especially for someone whose English is very clearly weak, to make broad sweeping statements like that.

And, if that particular topic is a concern, and you're interested in obtaining a Jaguar, you might want to crack open kicad and do a thorough layout review of it before 0.6-alpha goes to print. You could've cracked out git/kicad for this too, it's on github. Screenies were a mere convenience for lazy (read busy) mongrels like me ;-)

Fred.
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!
johntramp
LQFP112 - Up with the play
Posts: 119
Joined: Sat Apr 24, 2010 1:42 am
Location: New Zealand

Re: Guepard board

Post by johntramp »

I had cloned the repo and the PCB files weren't up. The most recent commit was 3 weeks ago.
User avatar
Fred
Moderator
Posts: 15431
Joined: Tue Jan 15, 2008 2:31 pm
Location: Home sweet home!
Contact:

Re: Guepard board

Post by Fred »

Then give him hell for it ;-)
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!
User avatar
flat4power
LQFP112 - Up with the play
Posts: 100
Joined: Mon Sep 24, 2012 8:19 am
Location: France

Re: Guepard board

Post by flat4power »

Image

MPX4250 3D module is wrong :)

I go update my git
User avatar
Fred
Moderator
Posts: 15431
Joined: Tue Jan 15, 2008 2:31 pm
Location: Home sweet home!
Contact:

Re: Guepard board

Post by Fred »

What is the big round thing in the middle?

How do you have bluetooth and ftdi connected?

What are the two tiny ICs each side of the big round thing? (near FTDI and near MPX4250)
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!
User avatar
flat4power
LQFP112 - Up with the play
Posts: 100
Joined: Mon Sep 24, 2012 8:19 am
Location: France

Re: Guepard board

Post by flat4power »

big round in the middle is the CR2032 battery for RTC

bluetooth is connected to RX1 and TX1 and FTDI to RX0 and TX0

between MPX4250 and battery holder you have the MCP2551 for CAN
between UC and battery holder is M41T56M6 for RTC
User avatar
Fred
Moderator
Posts: 15431
Joined: Tue Jan 15, 2008 2:31 pm
Location: Home sweet home!
Contact:

Re: Guepard board

Post by Fred »

Just curious: Why do you want an RTC? What are you planning to do with CAN?
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!
User avatar
DeuceEFI
LQFP144 - On Top Of The Game
Posts: 578
Joined: Thu Feb 25, 2010 3:57 am
Location: Gosport, IN USA
Contact:

Re: Guepard board

Post by DeuceEFI »

Can you push the .brd file so I can double check your MAP and AAP sensor traces?
I just did a "git pull" and a "git checkout dev" and the .brd file does not show up.

From your schematic and PCB photo it appears you are using a SMD AAP sensor, which according to the schematic should be "wired" correctly, but it appears you are using the through hole MAP sensor which should use pins 1,2,3 instead of 2,3,4 (like the SMD part). I would double check your datasheets and make sure the schematic and PCB traces are correct for the parts you are using.

Thanks!
User avatar
flat4power
LQFP112 - Up with the play
Posts: 100
Joined: Mon Sep 24, 2012 8:19 am
Location: France

Re: Guepard board

Post by flat4power »

RTC and CAN is for future use ;) not necessary

I'm going check my datasheet for AAP

with the last version of kicad no .brd but a .kicad_pcb
I just did a "git pull" and a "git checkout dev" and the .brd file does not show up.
I don't now how made that.
I had you to collaborator on my repository
User avatar
Fred
Moderator
Posts: 15431
Joined: Tue Jan 15, 2008 2:31 pm
Location: Home sweet home!
Contact:

Re: Guepard board

Post by Fred »

No need to add him as a collaborator, please reverse that, even if you intend to seek help from him :-)
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!
Post Reply