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That board looks pretty nifty, and the fact that it uses the same IDE, and by assumption OS, then that means that all my code should be more or less a direct port. The built in microsd storage and beefier voltage regulator are definitely big pluses. Who wants to pick one up and give it a whirl? chib...

Is this 8 cyl high impedance injectors? What RPM range are you looking for? I'm also assuming the typical sensors like coolant temperature sensor, pot for throttle position and pressure sensor for mass air flow. This is the 4cyl engine, I believe they are high impedance injectors, and the RPM range...

And we have lift-off!!

...or at least an injector that cycles when I tell it.

What's your general application and goal? What other circuits do you need? Basically, I just need to be able to drive injectors(4 for now, but functionality for more later would be good) in a lowside configuration(seems most injectors are set up this way) and down the road I will need a way to driv...

Are we talking about http://oshpark.com/shared_projects/IIL9xWih ? Yes it's a 2-layer board. I have ordered a set of three yesterday, you can either order yourself or wait till I get mine because I probably would not need three pieces. I am expecting to get them around Dec 2nd. Yes the plan is to g...

That's a 2-layer board that it needs to go on though right? Are you buying it printed then just soldering your components on?

Thank you for putting up with my questions and (probably wrong) assertions along the way. I really do read and try to understand everything people tell me, but my communication style sometimes puts people off when I restate things wrongly. At this point I am just in need of a working system, which I...

Thanks for the explanation, I'm kind of learning as I go. If I have the diode going to the 3.3V pin off the board, then even if it somehow manages to conduct, it will be putting voltage onto a 5V tolerant pin(one of them at least, no clue if the 3.3Vout pin on the board is 5V tolerant), I think. Any...

The RPM signal will be isolated from the injector circuitry, but to begin with I'm not going to be doing PWM on the injectors, just turn it on and leave it on while I check all the values, then put it on like a 50% duty cycle and see what the voltage tops out at. I can also wire it to a pullup input...

TTTriple PPPost PPPower!!! So I have the circuit all laid out and consolidated as much as possible... I can hook an injector up to it and see if it makes it click on and off... but what should I really be testing for? Just run it a while and see if it overheats? Watch voltage with a multimeter on t...

TTTriple PPPost PPPower!!! So I have the circuit all laid out and consolidated as much as possible... I can hook an injector up to it and see if it makes it click on and off... but what should I really be testing for? Just run it a while and see if it overheats? Watch voltage with a multimeter on th...

Or could I alter the circuit so that the diode in question dumps to the 5V regulated rail, not back to the 3.3V of the board, then the 5V regulator would take care of anything going above that, and as long as I made sure to use a 5V tolerant pin(which my board has) then everything would be fine righ...

Okay, that makes more sense... but the way he did the circuit, the MCU pin isn't connected to the injector, or the mosfet, it's connected to a mosfet driver that's supposed to 'shield' the board, right? By no means am I saying that's wrong, actually the more I read it definitely points to that being...

The above pencil sketch circuit looks fine, until you get some kind of transient spike. That's when the diodes will dump electrons to the 5V rail, causing the 5V rail to go higher than 5V. Most MCU's are only spec'ed for a max 5.3V some times as high as 5.7V. After that bad things happen. By this y...

*Artist's rendition of my wiring job(note the breadboard it's on!)

Joking aside, I'll post up once I get it hooked up to the board and consolidate my wiring a bit.

I had an Arduino Uno sitting in my room and I was using it to test my board(although I crashed my laptop about 4 times running two serial monitors at once). I just whipped up a quick sketch to output the crank pulse, TP voltage, and read the output from a single injector channel. Are you looking for...

I looked at that circuit, which is if I am reading it correctly... for power regulation to the board?

I really need to learn more about the circuitry side of things... I'm going to test the one I already have built and see if it works, then go from there.

Let me preface this with the fact that I know essentially nothing about circuits... but I think I can explain a few choices that were made in this one. The guy who has been helping me on the hardware side of things has been doing hardware design longer than I have been alive, and while I'm more than...

Parts engines are always nice!

What exactly do you mean by the multiple fuel systems? As in different types of fuel or different types of delivery? Sounds interesting either way and I'll try to help out if possible, I know a lot of the theory and a decent bit of the physics/math that apply to engines, injectors, carbs, tuning.

There's a teaser

Not particularly software related, but... ordered the parts to build my injector drivers and power supply just now.

Here's a shot of the schematic, poorly drawn of course...

20 degree accuracy is still under 3% at 800.

How hard would it be to translate the signals from one of those thermocouples into something readable by the MCU? It can't be that complicated of circuitry and I doubt it'll cost anywhere near $190 in parts.

It wouldn't be hard to test the accuracy of it though... And I wonder why they would include PIDs in the ECU labeled as EGT with it being fed from there with it being too horribly wrong. The precision needed I would assume isn't that much, when you're at 1700 degrees, 50 degrees is only 3%, which wi...

I could be very wrong, but from my few minutes of learnin' I just did, I'm pretty sure the qualification for it being able to report temperature is it being a 5-wire sensor, which I found this one http://www.ebay.com/itm/INNOVATE-BOSCH-OXYGEN-SENSOR-3737-/250910232518?_trksid=p2054897.l4275 on ebay,...

Like I said, I have almost zero experience with FI cars, except for what I remember from digging around in my friends Mazdaspeed Protege, which I was pretty sure had the O2 before the turbo. But I guess that doesn't really matter... You could always use a WBO2 for temperature readings without actual...

Most newer wideband O2 sensors(heated) also have a temperature output, or at least provide enough data for you to be able to derive a temperature from it. I don't know what kind of accuracy you need out of an EGT sensor in a turbo application, I'm not a turbo guy, but I know the stock O2 in my daily...

I'd love to have a completely closed loop setup, essentially eliminates tuning, just gotta get your algorithms right. I'd be worried about it wandering pretty quickly between lean/rich conditions though, it'd be essentially chasing its tail constantly... The theory for doing closed-loop process con...

The car we race is a hatchback 1993 Mustang, with the 2.3L I4 in it. For this year, it has all of the bells and whistles that Ford wishes they could forget they ever tried, including but not limited to an 8-plug distributorless ignition system to go along with a poor flowing and excessively spark pl...

It really seems to accomplish the same things as the ChibiOS/RT system, but with a bit more base level functionality. I tend to like the stuff that's actually backed by the manufacture, just for less chance of it disappearing out from underneath you like some open-source projects do, but the base le...