Doug emailed me with some questions:
> These days, embedded control generally means a web page for monitoring and controlling the device.
Well, IMHO the rPI makes this VERY easy, see
> Need a small board that has a header that plugs directly into the rPi header
Check out this:
This was mentioned in
> ... buffers for the GPIO lines -- not sure how to address direction.
IMHO Easiest to dedicate lines for out and in. Take a look at this:
http://ve3epp.blogspot.ca/2012/08/raspberry-pi-safely-interfacing-to-gpio.html (first part)
I bought 10 74HC14N off eBay from a cdn supplier for $0.50 each. Looks like he still has some:
> I am thinking seriously of included a dedicated Rs232 interface -- I am a
> big fan of using RS232 for automation interfaciing ( it is reasonable
> robust, and you can always go debugging without a lot of special equipment
Yes, I like good old RS232. If you don't need the full +/-12 volt swing, you can just do a 3.3 to 5 v ttl conversion. See above. Also see:
> I am also interested in 1-wire interface.
Have not done much with this yet, but a lot of people have, see here
You may get the idea that reading some of my old blog posts MAY be useful :-)
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