DIYEFI.org Forum

Please correct me if i am wrong: there will be two possible cases for ignition high current driver: 1. logical 0 = dwell state (high current charges the coil), logical 1 = no current through coil, causes magnetic field collapse if transitioned from logic 0. 2. the other way around injection: 1. logi...

Who's datalogging, this thread is specifically about power control of the EMS , not accessories that attach to it which will implement their own schemes. Furthermore, we established that people with worn out half arse batteries are out of luck and that the rest of us will do just fine on the consta...

None to little. Because you are neglecting the need of the user to have either polarity at their discretion. If this works, the user is relieved from having anything to do with polarity - no jumpers, no check boxes, no fried coils and flooded engines, no figuring needed polarity out - it just works...

That's because there was nothing in your link about properly handling of filling the capacitor at on time after an outage and then hard connecting it etc. A lot of complexity that isn't required. Worst case is you lose some logged data of some sort such as AFR differences from target or off duratio...

I don't see how your diagram helps with users that need the IO inverted for their application. Fred. ok let me try and make sense of it: (.. while looking at the diagram) case 1: logic level 0 causes the output driver to saturate (conversely, logic level 1 closes it shut) - upon the startup, assumi...

I doubt TA will do anything about the bootloader because, as far as I know, they use the unmodified Freescale version. This is basically what Karl implied attached is a scan of my analog-noob attempt at implementing the idea i described earlier. Perhaps people who dealt with op-amps can say if it'l...

Fred, by ON do you mean push-pull logic level 1 , or also high-imp (configured as input) and pulled up internally? did you just voltmeter it with no load? personally, don't see why freescale/TA would change this IO states/behavior, but for fool-proofness we can add specific instructions to specifica...

update:

just got off the phone with Karl @ TA.ca
he says that to his knowledge, bootloader leaves majority of the IO pins at their reset state (inputs, high-impedance)
He recommended going through the source code of the serial bootloader to make sure.

Alex

I think my idea would require them to be in high imp state in order for it to work (with your requirement to keep the original bootloader in-tact). The possibility of having automatic default polarity detection keeps exciting me. anyway, let me share the abstract idea: we need to come up with a feed...

Fred wrote: Links please?

no schematics, but general idea is discussed here. Didn't strike me as being tricky, in theory, but then again, i never implemented it.
http://sourceforge.net/forum/forum.php? ... 4&abmode=1