[maemo-users] [maemo-users] Wired keyboard and N800

From: Simon Moore simon.moore at ndirect.co.uk
Date: Thu Feb 1 12:27:45 EET 2007
Please don't say we can't use host mode on 800! 
Surely this can't be true? Anyone confirmed it is not possible?

Something work mentioning to the person trying to 
get the keyboard working is that some USB devices 
are very sensitive about the voltage it needs to 
be pretty much dead on 5v under load.  We use a 
maplin regulated camera charger (about £10 
believe it or not) for the 770 and it has enough 
to power the 770 and all the various USB bits we 
use (network, serial, hub and custom circuit board).

Note: if anyone makes a charger for the Nokia 
powering from the powered hub, you should be 
aware the nokia tuns off its charging circuits if 
the voltage is too low or too high also.  It also 
charges in a weird way that causes voltage ripple 
and pull back that may effect other USB devices 
(consider adding diodes and capacitors, to 
prevent nokia effecting other USB devices 
power).  Still it is pretty clever and stops charging when the battery is full.

I'll mess with the 800 when I have a bit more 
time in a week or so and see what I can get to work if no one beats me to it.


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