IMHO the purpose is to fry the Arduino rather than the Pi in the case of a bad mistake. The Arduino is the cheaper item to replace.
Weirdly this got me thinking about the old school mainframes I used to work on. The folk history says that they only had one processor doing everything. In fact this was far from the truth, many of them had processors to manage I/O for the CPU...
--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, John Ferrell <jferrell13@...> wrote:
> The purpose of integrating the Arduino with the Pi is to support the
> Arduino, not the other way around. I have a couple of prototype
> plugboards mounted on a piece of plywood (6x8") with the Pi. The Arduino
> will just be the chip, xtal & caps.
> Another project is simply to implement a MCP3008 AD with the spi
> interface. I think this is well documented at ADAFRUIT. Think of it as a
> lab project.
> Also, I think I would feel more secure with opto-isolator coupling for
> any attached relays. I am using simple Fets to drive the rotator relays
> from a MicroChip 16Fxxx processor now.
> I have yet to explore the details of an I2C lab project.
> Your web page http://n1jmm.no-ip.org/linux/commands.html has been a big
> help. I suggest you add ". <myscript.sh>" to run a script in BASH. Then
> again, may be I was working too late!
> BTW, I am looking to try the KALI linux distro on a PC to further my
> Linux skills. I understand KALI has the same roots as RasPI which is the
> Wheezy Model.
> I think the Gertboard is a good buy but I want to try this way this time.
> 73 de W8CCW John
> On 5/6/2013 9:51 AM, Jim Thisdale wrote:
> > Everything except ANALOG interface should be doable on the Pi
> > directly.. The analog could most
> > likely be done with some add-on chips. Have you looked at the
> > GERTboard? It is an I/O expansion card
> > for the Pi, not sure what it's features are. I think the Pi can do
> > these tasks without the help of
> > the Arduino. I haven't experimented with the I/O yet, just collected
> > up some I/O expansion chips to
> > experiment with.
> John Ferrell W8CCW
> That which can be destroyed by the truth should be.
> P.C. HODGELL