Bonjour, Le Sun, 31 Jul 2016 20:51:51 +0100 Luke Kenneth Casson Leighton <[email protected]> a écrit:
> On Sun, Jul 31, 2016 at 8:34 PM, Albert ARIBAUD > <[email protected]> wrote: > > > Thinking more about it, maybe you were thinking about up to 16 keys > > being depressed rather than 8, and the inputs' fan-ins adding up to > > twice more and the output's fan-out not being able to cope, leading > > to the input voltage not falling low enough for the keys to be > > detected as down. > > not quite... maybe i was but hadn't quite got it through from > subconscious into words.. but that's a good point - i was thinking if > you used 8 fan-in and press 9 keys... if you have 16 fan-in and press > 9 keys... > > basically the 16 fan-in it "activates" 50% less of the matrix. Hmm... Not getting what you're hinting at. Can you develop? > > Technically, I should have taken the switches' impedance (about 200 > > Ohm) into account in case it worsens things; but those 200 Ohms > > would increase the pull-up impedance and reduce the current, so > > actually a 0 Ohm switch impedance is the worst case already. > > > > So I think that's OK, but you know what? Let me try it. :) > > :) I'll do that tomorrow evening, though. Real World is looming. :) Amicalement, -- Albert. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
