[TriEmbed] Raspberry Pi & Port Expanders

[Robert Gasiorowski]

Yes there is, MCP23S17 and MCP23S08, both SPI.

Rob.

On Mon, Nov 9, 2015 at 9:22 AM, Grawburg via TriEmbed <triembed at triembed.org
> wrote:

> as many of you already know I'm a big fan of using an I/O port expander
> (MCP23017 or MCP23008) when I'm working with anything that uses voltage
> other than 3.3 VDC. I want to make sure the Pi is fully isolated from the
> devices.  I realize that the Python coding is a bit more involved when
> using an I2C device and that it doesn't currently run on Python 3. I just
> think the trade-off with protecting the Pi is worth it.  Now, here's my
> question: Is there a situation when I should not use an I2C chip, keeping
> in mind the projects I'm dealing with are, by most standards, relatively
> basic?
>
> At tonight's meeting I'll have part of my pipeline valve and pump project
> that is using a single MCP23017 because I need more than 8 I/O pins. If
> there is an interesting alternative to the I2C I'd like to know about it.
>
>
> Thanks,
> Brian Grawburg
>
>
>
>
>
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