I should have mentioned you'll probably want to insulate the electronics with something like heatshrink, tape, hotglue, a bag, plastic box...
If you put the Hacked Servo light circuit on a Stick or Potentiometer channel on your radio, it will let you have dimming through the radios Pulse Width Modulation. Maybe you want dimmable interior lights, or underglow, or something.
If you're running a more complex circuit that has a timer chip or something, you'll need to step up to a Recciever Switch instead of just a hacked servo. Most servos aren't going to drive the Output close enough to 100% duty cycle to ever let it run, so it'll constantly be resetting many times a second. You *could* make a transistor H-bridge setup still using the servo board to trigger on/off, but if you wanted to do that ya wouldn't be sitting in the back of the class with me.
An example, I built a Wig-Wag using a 555 timer chip circuit, which alternates 2 light circuits. It fails miserably hooked up on the Hacke Servo, but works perfect on a Recciever Switch. These switches generally add 2 or more "channels" of control (even though only using 1 actual radio channel) that are accessed by sequences of + and - throws from the radio, and really go beyond our scope of let's mangle some trash to make something cool. Plus they're pretty cheap too.
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Those nerds way up at the front of the class are doing some pretty cool stuff that can usually be adapted to our needs.
https://os.mbed.com/users/4180_1/not...-for-modelers/
Some sellers of interesting effects i've run across, but I have not done business with and can not vouch for.
https://www.modeltrainsoftware.com Evan designs
https://www.miniatronics.com/Merchan...ategory_Code=2 Miniatronics
http://www.bakatronics.com/shop/category.aspx?catid=133 Bakatronics
https://tennentm.wixsite.com/ironpenguin Iron penguin
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Questions are welcomed, if you try any of this i'd love to know and see pictures!