![]() (See Wikipedia for a big article.) If you can’t get this exact module, I suggest you order what you can with the same features and then find a project box to fit it. The one I picked has a feature called “optoisolation” which means that the high voltage is electrically isolated from any wires going back to your microcontroller. About the relay: When I wrote this, these pre-made relay boards had become pretty common and were available from a lot of different vendors, ready to connect to your favorite microcontroller. So we’re sealing the relay inside a small box and using hot glue to keep water from getting in. Now this is standard, many hand-held household appliances work this way (hair dryers, steam irons, etc.) but since we’re going to use this where it’s out of sight, at night, I wanted to make things as safe as possible. Why am I taking this much trouble on this project? It’s because the remote control that comes with these foggers has line voltage running through it. Once this is assembled we’ll hot-glue everything in place so it won’t move, and so water can’t get in, and then screw the top on. The connection to the prop controller plugs in on the left, and the cable to the fog machine connects to the relay on the right. ![]() The relay will be mounted inside the project box. Here’s what it will look like when it’s done. Jacobs Ladder - Large arcing electrical spark. Mail box trauma- mailbox pops open and hand comes out. Pour some dry ice into a large serving bowl (preferably insulated), and nest another, smaller bowl inside to fill with appetizers or a creepy figurine of your choice. Trash Can Trauma (c) - Character pops up out of trashcan. Hot air gun or hair dryer (for heat shrink tubing) Lawrence Lund's Halloween page - Lawrence Lund worked with others on many of these projects, each authors contributions are noted on each prop page.Exacto knife and something to cut on (small board, etc).You can make one yourself, check these out: You can substitute similar parts for many of these. 2095437 4x Screws 4-40, 1/2” 4x Nuts 4-40 1x 1” piece of plastic tubing, ¼” outside diameter, for stand-offs 1x Servo extension cable – connects the relay to the stereo jack 1x 3-wire cable – connects the stereo plug to the controller, 12” or more if needed 1x zip tie Heat shrink tubing The parts list is attached as a handy Excel file, with part numbers and websites. 1x Project box - comes with screws to hold it closed in a small plastic bag. Parts: 1x 5V Relay Module – SKU: 157153 1x IEC extension cable – this will connect to your fog machine.
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