I would like to use a Sparkfun Beefcake for mains switching. I have seen conflicting reports that say I could connect the +5 on the Beefcake to the +5 on the PI, and Gnd to Gnd. And that I could use one of the 3.3v GPIO pins on the PI to switch the signal on the Beefcake.
Some links talk about needing to switch using an additional transisitor.
I would be grateful for your guidance in this.