There is only one ground. The two ground pins are connected to each
other at each module, and the two ground wires are connected at the
power supply.
The only MOTM modules that use two grounds, are the digital modules
that use 5V.
On 9/27/07, randaleem put forth:
>Hi MOTM'ers!
>
>Quick question for y'all,
>
>Does the MOTM system use a clean/dirty GND? The two GND pins suggest
>it, but perhaps not?.
>
>If there is a separate dirty gnd pin, which of the two pins is
>considered the dirty gnd? (The one next to -V or the one next to +V?)
>
>Continuing, if there is a dual gnd setup: Do all MOTM modules respect
>this division of the return paths?