rusefi.com

That's a trick question because it depends on how it blows up. But the odds are that the FET drain to source will stay open, which means the MCU input will stay pulled up. At least, that's based on my experience with them.

Here is my suggestion for input: A simple NFET like 2N7002K is perfect for general purpose discrete inputs. Vgs can handle +/-20V. ESD protected gate. It is dirt cheap too. You can add debounce low pass filter if needed. http://www.onsemi.com/pub_link/Collateral/2N7002K-D.PDF This is what I will be ...

Anyone speaks chinese? lol I'll try to dig more too. But I think we should be able to track down the people who make those OBD2 to OBD1 conversion harness sold on ebay. Check this out: $17 shipped. http://www.banggood.com/Auto-OBD2A-To-OBD1-Jumper-Conversion-ECU-Harness-For-Honda-Civic-p-912667.html...

Ah, I see. At first I thought we are reinventing the wheel, but I get it now. Anyways a 4 layer design is easier to get clean return paths for high speed signals. Otherwise, you can introduce crosstalking if the returns paths are interrupted. General rule of thumb is that at high speed, return paths...

So what exactly is the purpose and difference of this board?

I am assuming we are looking for a DIY approach and not a product. If thats the case, what about using something cheap and readily available like the MiniFit Jr. Then find a cheap way to seal it? Like dipping it in silicone or something. Another thought, since you already have TE 176122-6. Why not g...

I have re-tested this with separate power supplies: +12 coil and +5v for the injector board are coming from my spare desktop power supply discovery is powered via USB by my primary desktop everything is on the same ground Unfortunately, same noise issue :( If I am less tired tomorrow I will feed th...

Don't worry, it's not even close to completion. I haven't had time to continue yet. I do have a few questions for yo. And I will need you or anyone to help with pinout at the top level for the STM32. STM32 Pins that needs to be assigned: In1-In10: Inputs to the STM32 G: enable pin for VR drivers; Hi...

kb1gtt, as you mentioned before, the Maxim chip inputs are listed to be -0.3V to Vcc+0.3V. I don't see why it IN+ needs to go negative at all with respect to ground. IN+ only needs to be negative with respect to IN-. In this case it will be. IN+ will be opposite logic of IN- and will cross their 'ze...

Hm I don't use TortiseGit, only the command line, but did you try adding .git? https://github.com/DanMoto/ECUStimS.git Sorry I realize git isn't popular here, but it is the only one I know how to use. I can move it to SVN if this a problem. Edit: I just found out that you can checkout github resposi...

I am a bit frustrated with Kicad now. It seems all footprints for the newer version is on github, separately for each class? Anyone know an easy way to get all the footprints? I might just end up making all my own footprint.

Progress...
https://github.com/DanMoto/ECUStimS

I normally use OrCad. So far, it looks straight forward using KiCad, so it not be a problem. I'll create small KiCad modules like all of the other designs you guys have already. I'll most likely use existing modules like the "high side and low side driver module - TC4427." It should drop r...

Yes, the STM32 can capture as well as the OLS. I have already planned to route to both. :twisted: :D Because the STM32 knows the state, STM32 can provide a trigger for the OLS to capture as well. I don't think STM32 will be a very good capture tool on its own. STM32 will be good for capturing timing...

x3 MCP42010-I/SL-ND x2 10x2 pin headers (black on the sketch) xX 5.08 screw-in terminals (red on the sketch) There are few things I want to clarify. 1. Russian, is there a reason you choose the 10x2 header at those positions? 2. I don't see VCC on the header. Do you intend to power this externally?...

We might have to be careful with ground referencing. Most RS232 are not isolated. For example, if our stimulator only provide VR signal and nothing else, then it is all good. But that's not the case, we have other signals as well, which can create a potential ground loop if the stock ECU designer de...

@kb1gtt Yes, I only suggested RS485 because RS232 was used with success. And because it was cheap and readily available. I really should verify the details first before making suggestions :( I do have a bad habit of jumping to conclusion really quickly. But thanks for pointing the details out to me....

RS485 is a bidirectional differential pair. So you only need to use to transmitter part of it, which is the driver. DI - Driver input, send your 1 and 0s here with your MCU. DE - Driver enable, set 1 for on, 0 for off. /RE - Recevier enable, set 0 for off, 1 for on. Normally this is tied together wi...

I can draw the schematic. I was planning to do one of my own anyway. I just need to figure out what else needs to be on the board. Based on what's been discussed, if you just need the VR driver, RS485 breakout board are dirt cheap. http://www.ebay.com/itm/MAX485-module-RS-485-TTL-to-RS485-MAX485CSA-...

As far as the physical driver, using RS232 driver is a very good idea. RS485 driver seems even better since it is differential. I think I will use that. Thanks for the idea!

:shock: That just doesn't sound right and should be illegal. Lol :D But seriously. You would have to synchronize the MCU and AD9858. Also any glitch you produce from turning it off can falsely trigger a zero crossing event. It sounds more effort than generating your own signal. Unless you have somet...

Again, no need for a DAC to simulate VR outputs. But if you want to go there, AD9858 (can probably sample it for free, otherwise around $5 USD on ebay) is probably a good choice- it's a function generator. I might sample a few and work something out. http://i.imgur.com/dhlQzJ4.gif I just reminded m...

But it's not theoreticals if its from a stock ECU. Those are proven outputs. The ECU doesn't care of its a real engine or not, it will still output the same result. I am not saying we shouldn't log the actual engine running. This is just a safer way to verify a design without possibly destroying mot...

I agree that logging is ultimately what's useful. The ability to log without having an engine is where I find the value of the stimulator. I think what we all want as the end result is to have an engine emulator. We can have feedback from the ECU for injection and ignition. We can create test profil...

Assume a 36 tooth wheel at 10000 RPM: 360000 teeth per minute / 60 seconds = 6000 teeth per second = 6KHz signal / 12KHz if you're counting rising and falling edges. MSP430G2553 @ 16MHz core clock (little brother to the F5529 in the LP I mentioned) can toggle pins well in excess of 50KHz; I suspect...

kb1gtt, your idea is simular to what I have in mind. And it seems to be the simplest/cheapest/most versatile method for low-medium speed signals. As far as VR simulation, the only problem I see with the VR simulation is that the signal bandwidth needs to be MaxRPM*Teeths*Resolution, which is most li...

Skimming through that ION sensing article, it seems that it requires a detonation initially before it can sense the angle. Perhaps one can use bank injection in the beginning to get it started, Then use ION sensing for precise angle and sequence. :idea: I am afraid this might be out of my range of s...

Ouch, 1ms delay sounds terrible. Thanks for the info, so I didn't have to find out the hard way. I think I will either fabricate a trigger wheel or perform bank injection. I haven't heard of ION sensing, but I will read up on that. Since it is costly as mentioned, I may not want it. I am pretty chea...

MAP sensor is an excellent idea. I really like it! Is this commonly done with success?

I should scope out how the map sensor output look in detail and see what I can come up with. But just brainstorming, I suppose I can AC couple an analog map sensor signal and look for the transition.

Thanks. I agree with you kb1gtt. My project is still in the beginning stage of just gathering parts. Basically, I want to convert my Honda CB600 into fuel injection. I am somewhat stuck on an idea while brain storming. Since the OEM setup only have a crank position sensor and wasted spark. I am stil...