<< Mentor Note -- Please read to the end of this thread -- important information about AC Mains connected projects is discussed >> Hello everyone, I am an electrical engineering student (though in the very beginner stage of it), and I could really use some help with understanding inputs and outputs of a device. My college's S.T.E.M. club is building a ring launcher, but we plan on making it display more of the levitation aspect of it (which is to say we do not want to launch it, but rather keep it in a levitating stage for roughly 30 seconds). We are all very inexperienced in almost every concept of the project, but are taking it on to learn as much as we can. At this moment, I have a pretty solid understanding of the way the actual device works, and most of the unseen forces at work. The thing I am struggling with, is understanding how to program certain functions into the display without taking on circuitry completely. (I simply figure that making something work once is much different than building a long lasting and safe circuit). After much research, I have come across "Smart Relays" from companies like IDEC, and they look very promising for accomplishing the goals we have, which I will list below. The biggest problem is that I don't know if I am understanding the website's listing of input and output correctly. It states the following: Product Type: CPU Base Module Operating Voltage: 100-240 VAC/DC I/O Range: 50 Input Channels: 8 Input Voltage: 100-240 VAC/DC Output: 4 Output Type: Relay I/O Expandable: 9 modules Then it lists key features as: Key Features 10A Relay Outputs Built-in Real Time Clock Optional Text Message Display panel Function block or Ladder programming New USB programming cable Worldwide approvals � cULus, CE, FM Class 1 Div 2, Lloyds Registered, and ABS approved My understanding is that the device can be hooked up in this fashion, 120V outlet > breaker > button > smart relay > two separate ring launchers, and I would like to ask for verification or dismissal (with explanations). I also see it as the device can handle 120V input, and output 10amps (If this is true, please help me understand how much energy I am actually putting into the ring launchers, and if it still equates to the same as simple plugging them into a wall). As mentioned above, the goals for the project are as follows: -Button is pushed -Power is turned on for the devices for 30-60 seconds -Buttons, knobs, misc can be pressed to activate the ring launchers -Once the 30-60 seconds is up, power is shut off for 30-60 seconds (cool down period) -Once cool down is complete, power can be supplied again (with button press), and cycle repeated. Could I also get verification that the smart relay can handle this with some program adjustment. Thank you for your time, and hopefully I explained this properly. The main thing we want to avoid is creating our own circuit(s) because to actually understand what we are doing completely with the circuits would push our timeline pretty far back.