4 ms·
Indeed, manufacturing is hardly a problem in the software world. =) Maybe get it laser engraved into aluminium and mount it... somewhere? Grey code is essentia
by shezi 6y ago
Indeed, manufacturing is hardly a problem in the software world. =)
Maybe get it laser engraved into aluminium and mount it... somewhere? Grey code is essentially a more robust spiral pattern, so that's the same idea.
What if you put a roll sensor on the chain instead and infer crank angle from that? Chain slip is rare enough not to worry about it, right? You'd also have more space and could use off the shelf components.
I don't think measuring against gravity will be precise enough to be one in 7200 parts. So you'd need a second sensor for that in any case (and likely already have, don't you?).
- hazeii 6y agoNice idea on the laser engraving, maybe we could use that inside the bottom bracket - thanks. We have considered the chain, trouble is both chains and chainrings wear and often cranks/rings aren't terribly-well centred (as fixed gear bike riders know, from variations in chain slack). For the gravity part we've tested a range of accelerometers; vibration is quite an issue though. Thanks for the interest!
- shezi 6y agoDefinitely do a writeup for HN when you find a suitable solution!