[TriEmbed] MOSFETs or Relays

Glen Smith mrglenasmith at gmail.com
Thu Jun 26 18:20:00 CDT 2014

Is the 12v supply ground and the pi ground tied together? If not you can
see some wacky results with 2 power supplies floating relative to each

- Thumbed one letter at a time on a 2.25 x 1.25 inch Galaxy smartphone
keyboard, please forgive any errors.
On Jun 26, 2014 5:12 PM, "Grawburg" <grawburg at myglnc.com> wrote:

> Rodney asked for more detail;
> Attached is the single n-MOSFET circuit (it's from the project manual I'm
> creating).
> The MCP23017 is an I/O port expander between the devices and the Raspberry
> Pi.
> Each MOSFET connects to a different output port.
> The ground is the ground for the 12VDC, not the Pi.
> I have not checked the output voltage from the chip; I will try putting a
> resistor in-line as suggested.
> Brian
> <https://en.wikipedia.org/wiki/Arthur_Schopenhauer#cite_note-55>
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