Instructables

R2D2 - Dark Roast Edition

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Step 12: Wire it up

Picture of Wire it up
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Wiring up the coffee maker is easy, provided you didn’t just cut the existing wires while taking the coffee maker apart.  Most connections are done with connector clips.  When these are undone while you take the unit apart, make sure to re-plug them back together as you go.  If you do have to cut a wire, mark it with a piece of tape and a sharpie.  When you wire up the unit just reconnect the wires as you go.  Mine was a two burner unit though, so I end up just cutting off and sealing the wires I didn’t need any more.  The indicator light and switch just didn`t mesh with the design so I went for an old school toggle switch and a industrial indicator light.  Installation was a snap and if you want to use the original BUNN light and switch you always can, a little trickier to cut out though.  I was originally going to use them on the chest and you can see the rectangular holes I cut out for them.  I decided against it, and thought about making a whole new body.  Instead I cut out a patch panel to cover the holes instead.  At first I was going to put the panel in the inside, and lightly weld and grind my mistake away, but decided I liked the look of the panel on the out side.
Grounding the unit is very important; you don’t need to fry yourself in the process of enjoying your coffee.  Originally my unit had only one spot where it was grounded.  I spoke to one of the electricians I work with about this and he said it should be fine as long as all steel components have a solid connection.  I was a little dubious and decided to ground on not only the base of the unit, but also to the tank itself.  The point where R2’s dome meets the body should be fine, but I thought better safe than sorry.   If you are unsure about this you should have a licensed electrician give a once over.  Most electricians will be happy to help, just bring the whole mess to them to have a look at.  Haven`t met one yet who will charge for something like this, but you never know.  If you’re still worried, only plug the unit into a GFCI plug.

Lastly the LED eye, this may seem like a silly way to power it but it was easy and free.  I didn`t bother to use a switch for it as BUNN coffee makers don`t use a switch for the main tank either.  So when you plug them in, they are always on.  Tying the LED to the tank seemed wise as it would be a reminder that the unit was still plugged in.  Now the LED I used is designed to handle 13.5 volts of DC power, or rather its resistor is rated for that.  It is actually 2 LEDS, one red and one blue soldered to a teeny circuit board.  I pried it out of wind-shield washer spray unit designed to light up the hood of a car.  I`m all about recycling, so I used what I had.  The coffee maker on the other hand is designed for 120v of AC power, so I couldn’t just hook them together.  Instead I took advantage of R2`s big hollow feet.  I simply hid a small cell phone charger that converts 120v AC in and outputs 4v DC.  Even though the resistor is rated for 13.5v the LEDs themselves only require 3.5v, with the other .5v going to resistor heaven.  I simple tied the ac plug section of the small transformer into the power going to the coffee maker.  When you plug in the coffee maker, the power splits to light the LED and turn on the coffee maker, unplug it and it the coffeemaker turns off as does the LED
 
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