kb1gtt wrote: ↑Tue Apr 09, 2019 4:46 pm
What are your problems with the 9926? Is this that low tooth count issue? I understand many honda's have a 3rd signal. Also is your signal a VR?
The math has probably been beaten to death here, but if I'm correct I need to be above 350rpm to beat the 85ms watchdog with the 4-tooth cam wheel, and over 1400 for the single tooth.
I've tried a little to play with the 9926, but I don't think any of its modes are really suitable for what I need it to do, and the fine pitch makes it difficult to rework in place.
I believe the way I've been getting engine starts so far is being close on the 4-tooth, and random triggers being close enough that the engine is able to catch to get into the usable range of the wheel. Having a distributor probably helps here, since I can't be too far off and still get a usable spark.
What I would like to do is emulate what Honda did on this engine originally, which is use the 4-tooth wheel for cranking only and then switch to the 16/1 trigger for sequential running. I think this might be possible through the FSIO config, but I need a reliable trigger before I start messing with that.
kb1gtt wrote: ↑Tue Apr 09, 2019 4:46 pm
I recall someone once was doing some stuff with a fairly generic op-amp. I recall some rough schematics posted some years ago. I think that might have been in the Russian side of the forums. Perhaps they have something of interest.
I have seen a few diagrams and designs with generic comparators and such, but this looks to be an integrated solution that just requires a few passives and a lot less board space, not to mention it's cheaper than buying the individual parts.