rusefi.com

I would add thermocouple to the list. I would also say yes we want 3.3V and GND, such that devices are powered via this SPI bus. Can we mimic the UEXT connector such that we can use existing Olimex boards? https://www.olimex.com/Products/Modules/UEXT/ They have many ready made devices including LCD,...

Order shipped, yipee! Looks like this will be here before X-mas.

Nice, is this the high pressure stuff with the high voltage injectors? Also are you interested in trying to drive that kind of injector? I once drafted a PCB circuit to drive this kind of higher voltage injector. However I never built it as I don't have direct injection to play with.

Generally you'll find the TB is much more open when the computer can do it. Basically your foot pedal is for commanding power. Traditionally you commanded power by letting in more air. There is a complete range of rich and lean conditions that can obtain the same amount of desired power. When you ha...

For $11 breakout board found here http://www.pololu.com/product/1212

Curious as to why run a voltage divider into a unity gain op-amp as opposed to using the op-amp itself to do the voltage division? There are pro's and con's with any approach. If you front end resistor divide, then multiply via op-amp gain, you also amplify the op-amps offset voltage. So if the op-...

For SMB packages, I see a range from 70C/W to 150C/W. I would like to suggest an external heat sink be used with these packages. The issue is that the diode package doesn't have a good thermal bond as a diode is just a block of silicon. I see that even when connected to a block of lead the thermal r...

The PCB I laid out has copper on top and bottom, with several vias to help decrease the Rth from top plane to bottom plane. I'm not sure what the rest of that app note may have noted, however I think that "still air" will be hard to find in an automotive environment. So I think this graph ...

Hello Sergey89, my russian is only as good as google translate will allow, so I'm replying in English. Sorry for that. I'm a bit concerned about the use of Rja = 100 in this image http://rusefi.com/forum/download/file.php?id=142. From this link I expect Rja to be closer to 25 not 100. http://www.fai...

Very cool, and good to see. As a note at 9kRPM I expect each channel to produce about 3 watts of energy with an absolute max of 5 watts per channel. Do you have some temperature measurement equipment? Perhaps a multi meter with one of those temperature probes? I'd like to see when all injector chann...

For VNB10N07, if your load is 1A, and you have 10A current limiter, I don't see the problem. Do you plan to use more than 1A, even a lowZ is only 5A. Unless you have a short to GND, you shouldn't approach the current limitation. If you use closer to 10ohm instead of 10kohms, your issues with 3V will...

2.2k has a Ton of 8uS while 10ohms is in the nS range. It would work for the pull down, but not for the series resistor. It really wants to be lower resistance.

While we are at it, should we make it more friendly for OPL assembly by using 0603 resistors?

From pg 59 found here http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00086815.pdf the max that can be pulled into the MCU is 160mA, and the max each pin can source is 25mA. With a typical fault current of 15mA, and if all 6 channels fault, we could dump 90mA, or...

I see that Igf Fault sink current, is limited to 15mA, with out the series resistor, this may be a problem. I'll have to check the STM datasheet to make sure it can supply 15mA to 20mA. Many MCU's can provide this amount of current as it's common when driving an LED.

The datasheet notes IISS is 100uA. It's my understanding that if the diagnostics feature is activated, the input pin will try to sink 100uA. Normally there is no current flow in the gate of a MOSFET, just the short term small stuff from the dynamics as the gate capacitance is charged. The datasheet ...

Cool, one caution with that module, which I need to fix, the via's are a bit to small for that footprint. The pins fit really tight, so just FYI, you'll want to open those holes up a bit.

I've seen these chips with SPI that can allow PWM with out the need for an external IO from an MCU. Can this chip do that? The function was intended for things like a cabin light that was to be dimmed where exact timing is not required. Also what kind of diag can you get from the SPI? I have a footp...

KICAD module for that AS4988 board found here. https://github.com/jharvey/Cinch_enclosure_template/tree/master/KICAD_Project/PCB-modules/pololu

For only a couple more $, you can get one with documentation and a supplier that will probably be around for years to come. http://www.pololu.com/product/1182 It costs less than $10 in qty 1, and doesn't need a heat sink. Also lots of example software can be found for this Pololu board.

Is this chip really a sweet chip? I see it would save a couple bucks in overall costs, however that only applies if you need 16 channels of low side. It's likely nearly a wash in cost for a 8 cyl engine, when done in low qty. The key it offers is lower costs in high quantity production, and slightly...

Often what happens with these chips is that an EOM doesn't need exactly what the MFG will ship as a min qty. So an OEM will order via 3rd party, who ends up with like 200 extra off the order. So it's common that as OEM's place these orders there are little windows of time when small quantity orders ...

From SeeedStudio's PCBA, they'll be populating the resistors, caps and screw terminals, providing 2 assembled and 3 bare boards, for $21, plus $10 shipping. Sweet deal :) I still have to populate the op-amp, and a couple items they didn't have in the OSL, however they are populating 11 of the parts ...

A bit more OT, this is a nice low cost CAN interface board. http://www.wvshare.com/product/SN65HVD230-CAN-Board.htm I've got one so I could even help play with it.

Ordered on November 24th 2013.
Cost 3 boards at $4.10 per batch of three. $4.10

Now I to order the components.

I guess I'll order the board even though I didn't get any feed back about it. I know there is at least one issue with it, i was hoping someone would make note of that before I ordered it. I guess I'll order in about 12 hours to give people a last opportunity to comment before I spend some $ on it.

For those that are new to CAN bus, I thought a picture might help



Sorry I broke my funny bone when I was a kid, it never healed correctly

CAN bus is often used for OBDII, however CAN bus is far more. I might encourage CTU originally drafted by EssEss. I have hacked a setup with off the shelf components, for not much $, I think it was less than $50. We had this passing CAN traffic to and from an MCU. We used it as a serial interface fo...

Great write up. I'll try to follow it this weekend. How crazy and or wrong would it be for russian to SVN his copy of Chibios studio such that a new developer can simply check out the top level SVN, then run a bat script to fix the path, then compile? This would help ensure that people are using the...

I believe a buffer is required, but don't quote me. The above noted Olimex board schematic shows a MCP2551-I/SN used for CAN buffering. I seem to recall the CAN buffer can be obtained on a small board for low $.