30 Jun
2012
30 Jun
'12
6:04 p.m.
On Fri, Jun 29, 2012 at 06:38:01PM +0100, Mark Benson wrote:
On 29 Jun 2012, at 07:38, Tothwolf wrote:
Wrong, the Micro-USB connector is actually a standard (and not just 'standard'
as the barrel connector). So, a device gets powered via Micro-USB connector?
Fine, I can grab a random wallwart with Micro-USB connector and it will work.
I can even order a random dirt cheap wallwart from $RANDOM_CHINESE_SUPPLIER
and it will work. I can even just connect it to the nearest computer and it
will work.
Micro-USB is a fully defined standard:
- the connector is standard, no surprises
- pin configuration, voltages and power limits are standard
Compared to a device powered via a barrel connector:
- which diameter?
- which polarity?
- or maybe it wants AC?
- which voltage?
- how much power?
Chances are, I don't have a suitable wallwart in my pile of wallwarts for
that.
Kind regards,
Alex.
--
"Opportunity is missed by most people because it is dressed in overalls and
looks like work." -- Thomas A. Edison
I work with a lot of embedded boards these days.
Design wise, I rather like the Raspberry Pi.
It is a nice piece of kit, especially at the price point. For embedded or
semi-embedded work it's really nice, my only gripes are the SD IO speed is
terrible, and the 5V power input is via a USB Micro connector not a 2-pole
barrel connector which would have been more 'standard'.