Mastodawn

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ceemos 4d ago

@memdmp oh god they trying network rid again, which qualcomm reps wrote the proposal this time?

ceemos 5d ago

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LeoDJ 5d ago

Sooo. Before I procrastinate it any longer (because my perfectionism claims that it's not finished enough), I've decided to finally publish the current, unfinished state of the firmware and some accompanying documentation for the #startergenerator

https://github.com/RainbowLabsDE/BSG-Driver

I hope it helps ;)

GitHub - RainbowLabsDE/BSG-Driver: A WIP firmware to control a 48V belted starter generator (BSG) out of a Mercedes MHEV

A WIP firmware to control a 48V belted starter generator (BSG) out of a Mercedes MHEV - RainbowLabsDE/BSG-Driver

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ceemos 6d ago

@siliwan nominal range is 1000km around frankfurt iirc and we should be well within that, but maybe there is some noise source on 77kHz (popular with power supplies these days)

ceemos 6d ago

so the (not that) old radio clock thingy somehow stopped synchronizing time with dcf77. maybe züri is just a bit far away (but it used to work?), maybe there is a bit too mich noise in the apartment now?

anyways, after thinking of solutions to fix this, it appeared to me to just google "ntp to dcf77" and ofc that exists, and it worked immediately, and now we have on somewhat accurate clock again

https://github.com/ORelio/DCF77-Transmitter

(this was my first time using an esp controller, actually)

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ceemos Mar 11

@helle that might still work but it makes it more cursed -- instead of nice +-15V drive levels you might end up with +10/-20, but that would still be ok

but also you need to be sure the controller does not do anything stupid at startup/shutdown, or at least give the mosfet some thermal mass in case it goes linear for a bit... generally i'd only considered that for high power low efficiency stuff, not sure how it would scale down

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ceemos Mar 11

@helle if you know you will always convert down to less than 50% of input, you could go the cursed route of putting a gate drive transformer in between

i have thought about that for way too long but never tried it, it is also very cursed, but it should just work

the only dangerous operating mode would be very long on times, where the positive output might not turn on the mosfet properly any more while the negative gets too close to the max gate voltage

ceemos Mar 7