DIYEFI.org Forum

:lol2: I know these loud scary backfires you talk about that result from way wrong trigger angle. (funny story with the kid there) I think i've used 320degrees for the #1 trigger (or whatever it's called, it's been awhile) running ms2extra on my US S50 (essentially bored,stroked and cammed M50, not ...

Got one of those hammond ones here are some spy shots, if anyone's curious: http://i3.photobucket.com/albums/y64/ababkin/projects/enclosures/hammond/IMG_0316.jpg http://i3.photobucket.com/albums/y64/ababkin/projects/enclosures/hammond/IMG_0317.jpg http://i3.photobucket.com/albums/y64/ababkin/project...

How about just using a tri-state buffer since we need a buffer anyway, to take care of undesirable/indeterminate bootloader/reset state potentials. Hold outputs in the 3rd-state (puts all outputs in high-imp) by pulling the appropriate buffer pin, until the MCU is out of bootloader , then overwrite ...

can someone please elaborate on the following - inversion driver - reverse-polarity input diode and what good would it do for the problem at hand? Also, Fred, did you miss my earlier post? Still waiting for reply. EDIT: i've decided to move my proposed solution to this problem here: http://www.diyef...

toalan: What ghetto analyzer you have? i haven't seen a free one for 3E jharvey: I think the time-critical part of EMS is the perfect field for programmable logic. Usually there is just not enough high res counters in regular uC's to cover many cylinders (barring the software ISR's with their indete...

No automotive projects i've seen

what board did you get? There is a free logic analyzer project for one of the digilent boards (spartan 3 , not 3e though)

Alex

^^ seems correct. You've described one possible scenario in regards to polarity. I am guessing, the whole discussion is about how to make freeEMS suit needs of people with different polarity options of their power circuits. A simple and flexible solution is jumpers and checkboxes, but it is not fool...

Ok, good, let's try again then is this what you are trying to say? : Two possible cases that depend on particular user's setup (types of high current drivers for inj and ign): case 1: MCU pin = 0 causes: output energize, aka saturate, aka pass current OR MCU pin = 1 causes: output to close shut, aka...

ok, i give up
seems like asking for clarity is asking too much

Is it just me or the above post is incomprehensible?
how can logic level 0 make it squirt and not squirt at the same time? unless there are plans to use quantum computer for EMS

does anyone else understand what Fred is trying to say?

Alex