<div class="iw_mail" dir="LTR" style="font-family: Times New Roman,Times,Serif;font-size: 16px;">To all,<div><br></div><div>According to "KISS" I should use the relays for my set-up. They work well, are not expensive, and easy to program (although I really dislike the 'Low = On' of this approach). Were I not using pre-made track turnouts and could then have individual solenoids for each direction I'd probably want to create a MOSFET setup. One thing I will change in the current relay-based setup is to make sure I have a common ground between the Pi and the other components. It never dawned on me that having a ground for the Pi, a ground for the 5 volts running the relays and the 12 volts switching the track was bad design. I will keep playing with the MOSFET solution just for the fun of it, but discard it for the present time for the Raspberry Pi projects here at the museum. I also can't afford to make a mistake and burn out a turn-out -- they are a little expensive. (I've already burned out 3!!)</div><div><br></div><div>I'm going to look for another project that could utilize a MOSFET or a relay to show how the coding is different (active HIGH versus active LOW) for each and how a solid state device has advantages over a mechanical switching device. </div><div><br></div><div>Rick, Rodney, Glen, Paul . . . thanks for your suggestions and guidance.</div><div><br></div><div><br></div><div>Brian</div></div>