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

[Joerg <joergsch@xxxxxxxxxxxxxxxxxxxxx>]

DJ Delorie wrote:
>> Of course, the super deluxe solution would be PoE but that is a recipe 
>> for project drag because now you'd have to add a litte switch-mode 
>> converter.
> 
> I've looked at PoE before.  I need an AC reference signal anyway, I'll
> just use that.  I mean... I'm inside the source of power for the
> house, I shouldn't need to go elsewhere for power ;-)
> 
>>> Of course, with ethernet, I need a separate programming circuit.
>> If they all got a different IP address wouldn't it work with just 
>> routers and hubs? The last 4:1 hub I bought was under $10, IIRC from 
>> Walmart. Plus a bootloader in the uC in case you need to re-flash that.
> 
> The R8C has a built-in bootloader that uses a serial port and two
> control pins (mode and reset).  I use an FTDI usb to serial chip to
> interface to that.  If I use ethernet for communication, I still need
> some connection to the serial port and control pins.
> 

I don't know the R8C. But for other uC such as the MSP430 you can write 
a little "Delorie-Bootloader" that works without the manufacturer 
prescribed HW-handles. People have, for example, written bootloaders for 
rough environment use where you can pipe the whole new code into it via 
a little photodiode. The downside is that all this adds to the project time.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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