Miniature home made fuel only bike ECU

[Brian]

Hi, this is my first post, here is something I soldered up with a nanocore12max. It's a one-off PCB, designed for fuel only, alpha-n, with baro correction. The spare TO220 slot is for PWM fast idle valve. Inj drivers are IRF540. It was designed to run on MS firmware, hope it works. I own a MS2 daughtercard that has never controlled an engine, but done a lot of bench testing. It is sad to me that doing things like this aren't cool on the MS sites, but that's OK, whatever.



There is another 20 passive components mounted under the PCB under the Nanocore.

[Fred]

Hi, welcome along :-)

That is a very nifty little board indeed :-) I like it.

Two things :

A) Do you mind if I move it to non-free as this area is supposed to be for non EMS stuff and I think it fits best there.
B) Please don't publicly share your PCB designs for B&G stuff on this site (keeps me out of trouble). (don't mind the pictures at all though).

What are the dimensions of it? looks like maybe 50x80 or so?

Thanks,

Fred.

[Brian]

Sure, put it where it belongs. I looked around but didn't know where it fitted and "soldered" sounded like a best fit. 50 x 80 is close enough. This is for a bike, so size is important. : )

[Fred]

Cool :-)

Check out Tony's thread on his bike in th user rides section, those are his home built bike boards too :-) Pretty cool stuff both of you IMO.

I'll move it now.

Fred.

[jharvey]

Nice and I like the SMT work. It looks like you used and soldering iron and solder wire to make your PCB, then perhaps through a re-flow. I might recommend the paste from this guy.

http://www.zianet.com/erg/ShopSolderPaste.html

He has some nice video's recommending how to use it. My personal preference is to use the paste and an iron, but that's mostly because I'm impatient. Ever since I started using the paste, I haven't been able to go back, and go back I mean to through hole, or SMT w/ solder wire. It makes it so easy if you can get good paste.

[Brian]

Thanks for the link, haven't done SMT for a long time. I used to do SMT rework years ago using a hollowed out soldering iron tip (Hakko) and flux. For this PCB I bought a flux pen from Jaycar and used a normal temp-controlled iron and solder. Can't access the videos due to old Win98 machine but have access to an XP machine and will check it out. Would be really good if I can learn to hand solder LQFP packages. Might have to get some of that solder paste you linked to and practise on a broken Fisher&Paykel PCB from a washing machine that I have lying around somewhere.

[Fred]

http://www.diyefi.org/forum/viewtopic.php?f=24&t=166

Check that out :-)

Fred.

[toalan]

Nice Job.

Please keep us posted.

Regards,

Alan To

[Brian]

It's in and running, needs tuning, but rideable, it's a bit too rich under load and a bit too lean on cruise. No hardware bugs so far, rode a few trips total maybe 30 mins, all is well so far. Then I ran out of weekend, so will be tuning next weekend. It has just 10 wires (22 gauge) between it and the main connector. The DB9 is for RS232. The IRF540 inj drivers seem to be doing well, I have not used them before.

[Fred]

It's so cute! :-)