rusefi.com

Do you know the response time of the existing sensors? The MPX series has a certain delay I think it was 1mS. Do you know the delay of the existing sensors? You may need to add some delay or filtering to get the same signals. If the MPX has a faster response time, the extra noise might cause problem...

I had posted this some time ago, it might be handy for a comparison. http://jaredharvey.com/Files/projects/Engine_control/snow_blower/Murata_temp_curve.xls To change to 3.3V change cell C5 to 3.3 instead of 4.5. Take note that many thermistors do not like to go over 2mW, so when column G goes over 2...

I would think an early item you need to figure out is what signals they provide over a variety of pressures. Once you know those graphs, then you can figure out if you need CPU or not. You might find the MPX series of chips are good enough as they are now. I believe you are looking to do something w...

Long time no speak, good to see you around. I forget the details of your bike. I seem to recall the existing sensor was a pressure sensor, not a flappy paddle, and not the hot wire thing. So it's a MAP not MAF sensor. Is that correct? Do I also recall you had multiple sensors, not one? Where do thos...

Ooops, I see D2 now. To add via, simply add trace to pad, then press V for via. Add the via at the edge of the pad, such that part of the via touches the solder pad. Hmmm, I see what you are saying. G1, G2, G3 and G4 should be added to the symbol. Then they will get a net name, then you should be ab...

I finally got to solder it up, only to find I purchased the wrong op-amp, and the op-amp I want is hard to get. To fix this would require a respin, and waiting a month. Blah. The op-amp I wanted was the SOIC package with this part number, MCP6G01T-E/SN. However I ordered MCP6G01T-E/OT in a SOT-23 pa...

If one chooses a tablet, I'd suggest picking one from this list http://wiki.cyanogenmod.org/w/Devices#vendor=; that will allow much more flexibility from a developer stand point.

Generally, the 2 internal layers are PWR and GND. Also generally you place the GND vias as close to the GND pin as possible, as well as the PWR via and you avoid any physical barriers on those planes. Then the signal traces are on the top and bottom layers. So I would say yes the STM wants the 4 lay...

I got one of those nextbooks and I'm a bit disappointed. It does not allow for the playstore to be installed, so it's quite difficult to get programs installed. I'm looking to see if I can get a different OS installed on it, as it appears the playstore issue is purely a software issue not a hardware...

From an eyeball inspection, I'd say it's good assembly. These are hand soldered, so assembly quality will probably vary from build to build. However for this board it appears they used enough solder, they did allow it to reflow long enough to bond to via's properly, they either cleaned it, or used a...

The Discovery F4 is a 4 layer board design. I seem to recall the gerber files are out there some where. Kicad can import a gerber, this may be helpful. However in the past I've failed to connect the gerber traces to a schematics netlist. Perhaps there are new tools in this most recent version, or pe...

Sweet order recieved. Total lead time from when ordered to when received here in the USA was about 1 month. The assembly time was less than 1 week, and an initial inspection shows they probably did the assembly correctly. http://daecu.googlecode.com/svn/Hardware/trunk/MCU_pin_protect_PCB_1channel/pi...

why buy new if i can find used,old electronic ? My take on this is that we should provide a MFG part number and at least one supplier part number, such that you can buy it from a supplier if you prefer. However you don't have to use that if you don't want. For screw terminals, I used these http://o...

Perhaps worth mention, this is an opensource mixed scope software. http://dangerousprototypes.com/2011/07/10/sump-logic-analyzer-with-2-scope-channels/ it's handy as it also can decode SPI streams and such in side by side with the analog signals. Perhaps you can make your serial stream match the SUM...

Unplug one side, it should float to 2.5V, then connect the other lead to the hall. It will go from 0V to 5V, when it crosses over the 2.5V threshold, it will toggle the output.

Good data. Do you happen to know if the OEM connector is an Tyco connector or something like that that can be purchased? If so I can probably make you a break out adapter, or perhaps even something that plugs into the OEM harness. One issue to consider with hall, is that they often have internal aut...

This is probably a better place to answer my questions about the build than in the hello thread where I asked them. I see you have already answered some of my questions in this thread. So lets carry on here instead of there.

Has the "LM267X Made Simple (Version 6.0)" software been used to do some kind of verification? I see that software is noted in the datasheet for the switcher. Upon a quick look, my primary concern would be ripple rejection. Do you know what kind of ripple to expect on the 6V? Also do you k...

Digikey BOM is probably not much of an issue. I've been putting such information in the schematic symbols, which means a BOM can be created by simply exporting the BOM when in the schematic. In the schematic symbols, I generally put in fields for the MFG and MFG, as well as one supplier typically Di...

I had once done this on an IO board. See page 2 found here http://daecu.googlecode.com/svn/Hardware/trunk/KICAD_Project_TRK-MPC5634_P3-P4-ETPU_IO_proto/TRK-MPC5634_ETPU_IO-board-sch_RA.pdf Look bottom right, for the TJA1051 chip. It wouldn't hurt to add the RF choke and ESD noted in the schematic ab...

We really need to get you a scope of some kind. A $7 USB sound card and a DIY interface goes a long way. http://www.electronicsfaq.com/2010/05/poor-students-oscilloscope.html is a good reference. I suggest the CM108 chip set. Also good reference http://www.automata.hk/projects/scope this interface i...

Blah, that's far worse of a spike than I was planning for. My plan was just a guess and was based on if you exceeded 20V for more than around 5 to 10 mS, it would blow an upstream fuse. I'll have to re-evaluate each design after I get to absorb that spec. Which will take a couple days. I'm also sure...

Beware the rail to rail bits of many op-amp limit the input voltage to less than V+1, so an op-amp powered by 5V will shunt current to the 5V rail if you exceed 6V on the input. This will cause the rail to pull up from 5V if you don't have something pulling it down.

Can you shorten the GND loop from the pencil coil? In the video it appears you have that connected to the driver board's screw terminal. That's probably lifting when the spark current pass through the GND. If it lifts by only a couple V, it will cause the pin to detect as high instead of low. Also d...

Oops, I really should use MMBZ18VALT1G (18V) instead of GSOT24C-GS08 (24V). You are correct that 20V g/s is lower than the 24V clamp I was using and should be clamped to 20V or less. Note the 18V will really be closer to 19 as I'm using both diodes back to back. I'm not crazy about adding extra part...

Perhaps of interest, see assembly technique found on this page, where the connector is put on the edge of a PCB.

The coil on plug will pull massive amounts of current, and when powered via the STM board, it likely exceeds the boards ability to provide that power. You could try a massive cap preferably at the pencil coil across the 5V lines. It looks like you are USB powered, I seem to recall USB can only provi...

Nice, I understand that's fuel pump, all fuel injectors, and spark control, with OEM sensors. Good job and keep up the good work.

Opendous has a good SD card KICAD reference picture found here http://code.google.com/p/opendous/wiki/LPC313x_DIP_Board uses this connector http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3M5607CT-ND