Re: gEDA-user: powermeter board, with less ground planes :-)

[Steven Michalske <smichalske@xxxxxxxxx>]

On Nov 4, 2008, at 4:28 PM, DJ Delorie wrote:

>
>> Theoretically you could use a doorbell transformer,
>
> Hmmm... theoretically, I could use the doorbell transformer I already
> have, on that panel at least.  The other two panels don't already have
> that.  But I need to get the data off the board and into a PC too.
>
>> For data USB needs a direct connection and if that's all the R8C
>> got, what can you do?
>
> Actually, it's got a serial port.  I'm using a FTDI chip to do the
> USB, but it allows me to do remote programming as well as
> communication.

you could isolate the FTDI and have it be bus powered.  RS-232 lends  
itself well to opto-isolation.

>> Ethernet would be isolated but I don't know what's out there on the
>> market to isolate USB.
>
> There's probably a simple radio link for the UART too.  If I knew it
> could get out of the metal box and across the house, I'd take the time
> to figure it out.  It would save me having to put computers near each
> box to take measurements, too.
>
> But I know how the USB circuit works, and it'll be good enough for my
> purposes.
>
>
> _______________________________________________
> geda-user mailing list
> geda-user@xxxxxxxxxxxxxx
> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user