rusefi.com

PWM / DAC should be before the opamp.

Perhaps vref source could be optional PWM / DAC input? I know the goal is no firmware, but having a software adjustable threshold is likely a desirable feature. These PWM / DAC are handy as you can PWM digitally or if you have a DAC you can just DAC the thing. This would allow for an adjustable thre...

LCR tweezers are handy
https://www.seeedstudio.com/Mini-Digital-Tweezers-DT71-p-4696.html

I guess error check the temperature profile and trigger an error. Aka if engine is not warm after 10 minutes then limit power. Frozen block, loss of coolant, broken sensor can cause bad temp readings. Limit power to limit the damage. I guess the same for a stuck thermostat. Wrong profile could cause...

Hmmmm if etb claims 0% yet MAF = WOT then limit fuel to 10% or ignore high sensor and only use lower power sensor or do something like that.

DB37 = evil.

How much lower cost is this than a TLE8888? I see thru hole, so that's expensive. STM32 with TLE8888 is about all you need, and it's reasonably low cost.

Here are some notes about how I merged two kicad projects (both schematics and PCB) in KC5. -- Copy one project as a startting point, AKA PT2000 --> TestMergeProject -- Delete extra files, .csv, gerbers, .net, etc. Modify files like knownissues.txt -- Rename core files AKA Common_Rail_PT2000.XXX -->...

-- If rpm rate of change is bad 5krpm to 0rpm in one rotation then cut fuel pump. -- if over temp then limit hp or do something to protect the engine -- if speed density sensor failure, then switch to alpha-n or average two fuel algos or something like that. -- if unreasonably air temp then ??? -- i...

Looks like jlc has shift registers.
https://jlcpcb.com/parts/componentSearch?searchTxt=Shift%20Registers

How about 36 dip switches connected to a shift register so you can emulate a 36-1 wheel? 100% hardware and emulates a common crank pattern.

Doesn't the discovery have a headphone jack?

This is where it used to be, see the history on this page, it has a honeywell app note, spreadsheet, and many details about VR's.
https://rusefi.com/wiki/index.php?title=Manual:Hardware_Trigger&oldid=2806#VR_lower_level_details.2C_formulas.2C_app_notes.2C_etc

How do you search the new wiki for content? I know there was a honeywell app note and spreadsheet that was on the old wiki, it also detailed many specs of the typical VR sensor. I used to search the old forum for "300V VR" but that does not work any more. How do I find it on the new wiki?

Pictures can be uploaded to the rusefi forum. You do not need the external service to host the pictures.

Do you have a simulation for this? I'm not fully following how parts of it work. I'm concerned that it would be weak against common mode noise. Can it be adjusted to use the opamp as a differential input?

Would dedicated STM32 that is independent of rusEFI firmware an OK solution, or does that also cross the no firmware solution? AKA dedicated chip, instead of integrated solution.

This is an article about a tool that helps with searching JLC parts. https://hackaday.com/2020/10/11/improved-part-searches-for-jlcpcb-parts/ The general process is that you browse to the below page, you click the update in the top, then wait for a while to download and update and add the components...

Posted in April of 2020
https://www.electronics-lab.com/convert-easyeda-files-kicad-just-one-click/

These are snippets found in the below link. Of course if they said it on the internet, it must be true. https://www.theglobeandmail.com/globe-drive/culture/commentary/the-problem-with-ethanol-in-gasoline/article29103634/ Because it is an alcohol, ethanol dries out the rubber components in a fuel sys...

The MRE is very small as is. The TLE8888 chip is fairly small. Sure we could save some space with different less capable chips, but not very much. Perhaps the size of your thumb nail. Why is MRE to large? My lawn mower and snow blower wheel's are not going to buckle under the weight of MRE. Perhaps ...

Hmmm, 3.3 may also be a concern. I would suggest changing to all 2.2 if you can stomach it.

While your at it I suggest changing the oil prosper switch. It's cheap and a bigger to change. I also understand the injectors will be stuck. You might want to consider just breaking then all out and replace them. I understand even with the head off they are difficult to get out.

Perhaps put a 5.6V Zener or similar voltage limiter on the output of U14. Perhaps something like this. I have not check the watts, so I'm not sure this 1W would be OK, but something like this could be added to clamp the voltage.
https://octopart.com/1n4734a-on+semiconductor-1310081

In Figure 3 of the below PDF, it notes with +/-5V (a 10V swing) you only get 6V range, so I expect you loose about 2V on the low side and about 2V on the high side. The range is often not exactly centered, in your case it appears yours is 1.5V from the bottom rail. https://www.st.com/resource/en/dat...

Grinder seems like a good plan

Yeah, the old push before you pull, that's huge with those connectors. I often give a dab of WD40 to help break them free on the push.

Very nice. The LCD looks nice and bright. I'd be that can be seen well in daylight. It has a decent refresh rate as well.

Looks like allot of the schematic is very similar to this one Waltech did, except STM32 instead of AVR. Good to see a more useful version of the design being done. https://waltech.com/cszcms/wide-band-oxygen-sensor-project-report Once a standalone board is done, could this be merged native rusEFI fi...

What opamp are you using? Opamps do not go to the rails, as well there are things like offset, and gain which are important. Plenty of opamps can actually drive to the rails - the MCP6004 used on Frankenso, MRE, and Proteus can, for example. The opamp's open loop gain is largely unimportant, as nob...

What opamp are you using? Opamps do not go to the rails, as well there are things like offset, and gain which are important. What program is this done in? Could you share the native file format? I'm assuming your program can do things like highlighting a net, which is handy when trying to track tagg...