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Can you help me out with this? I really need help Answered

I know its long but you would help me immensely if you answered my doubts, questions, and inquiries. I would greatly appreciate it.

Alright, I need to bring in a project for school. So I'm bringing in an XBOX controller to mod. To put in LED's for the ring, the guide button, and the ABXY buttons. However, Im not to sure what exactly to do for everything else other than the lights for the ring.

Obviously you solder the 0603 smd's but then for the guide button I want to put 2 2.5mm Ultraviolet Super High Brightness LED's for that. And before anything 5mm do fit. Im not sure why other tell me they dont but they do I've tried them.

But anyways, My rechargeable battery for my controller gives out 2.4 Volts. If I could I would use this but I do not know if this voltage is too low for all the lights to light up correctly. So I was thinking of using the battery pack with the 2 batteries which give out 5 volts. But If I dont have to please correct me.

In addition I'm not sure if I need resistors, but I heard if the supply voltage of the LED's are over 3.0 for a wireless controller, that you dont need any type of resistor. Im guessing I should solder them to the prongs or the rumble wires. So yeah.

Then I want to do the buttons. I will use 1 White 5mm High Brightness LED's for each of the buttons. They run at 3.3 volts. However again I do not know what to do. To solder it right to the prongs I'm guessing so that way they're on while my controller is also on.

There is one problem though, the rubber pad. How would I conect the wires to the prongs or rumble wires if the rubber pad is there to activate the buttons. I was thinking of making a very small hole in the rubber where no contact is needed to activate anything and run the wires through there. If I should'nt just tell me otherwise.

And if your still reading, Thank you for taking your time and doing so. So once again I would greatly appreciate it if you take your time and answer my inquiries.

Thanks, Really Appreciate it,



You said you need to "bring in a project for school". What are the requirements for this assignment?

The reason I ask this question is because I think there's a real possibility you've chosen a project that's more complicated than it has to be. Moreover I think there is danger that any one of these complications, including:
  • tiny hard-to-solder SMD parts
  • the need to route wires around existing button structures
  • insufficient voltage (only 2.4 V) from existing battery pack
could sink your project.  I mean if you have nothing else to do but work on this, you can knock out these problems one by one, but it's going to be a long arduous struggle.  And if it's for some kind of school project, that implies there is a deadline, a deadline that will be hard to meet. 

It's not that I don't like your idea.  Rather I see too much effort for too little reward.  That's why I am wondering what the actual requirements for this project are.  I suspect there may be an easier/better solution.

Well honestly there is no due date. Im in mechanics class and the teacher says that I will grade you on your effort and your progress on the project. You can take as long as you want on it, just you need to be active and not asleep during class.

I just need a hand and someone to tell me what direction to go. So if you could thanks a plenty.

This is a secondary school level "mechanics class" ? If you live in the former United States secondary school is called "middle school" or "high school".  This is not for a college level mechanics class, right?

Since the class is called "mechanics", I am going to humbly suggest that your project should actually be something mechanical, something involving forces and  motion.  I get the impression you like electronics, so maybe it could be something both electrical and mechanical.

Something I always wanted to build, but have not got around to yet, is one of these "solar pendulum" toys.  Basically what it is is a pendulum, a mass that swings on the end of a string, except that it is actually powered by an external source of energy so that it doesn't stop.  It just keeps swinging forever, or as long as its power source endures. I.e. it stops when it runs out of sunlight, or batteries, or whatever the electrical power source is.

The link below is to a retailer that sells this project in the form of a kit.

But I just checked, and they're sold out. However the instructions for this kit, which contain almost all the information you'd need to know how to build it, these instructions are available for free in a pdf, here:

I searched a little on Instructables to see if someone had written an 'ible for this "solar pendulum" toy, but I didn't find anything. Maybe that means I have to be the one who writes one.

I don't what you think of this pendulum toy idea.  If it looks too complicated for you, the other thing I would suggest, that is both mechanical and electrical, is some sort of generator toy.  For example a "windbelt" made from old hard drive parts. There are ibles on this subject.

Also, I wrote a generator-toy instructable kind of recently, here:
Although I'm not sure if that's what you're looking for. It was pretty easy though.

Honestly I just want to put in all the LED's in my controller. I t is something that I have been wanting to do for about 5 months now and I have now been pushed or more anticipated to do it since I have time at school.

I also play Xbox for quite a bit of time. About 2-3 hours on the week and 6-7 on the weekend so I see it as something that i can actually use.

So yeah. But if what I'm doing doesnt work out I'll check out the solar pendulum.


When turned on an LED has a characteristic forward voltage, Vdiode, for both large and small amounts of current.   The easiest way to drive such an LED is with a voltage source and a resistor. The voltage source, Vsource,  has to be greater than Vdiode, and the resistor is chosen to set the current according to the formula I = (Vsource-Vdiode)/R.   Notice that since Vsource>Vdiode,  I is positive.  In the case where Vsource<Vdiode, the formula doesn't apply.  When Vsource<Vdiode, you don't get negative current.  Instead you simply get no current, or I=0.

The resistor is necessary.  It's what limits the current. It keeps the LED from drawing too much current and burning itself out.

Take a look at this page and see if it makes sense to you.

And test all your LED circuits wired together outside the controller first, before attempting to move them inside the controller.  This way you won't make a mess of the existing controller circuit board, or what I mean is it will be less of a mess than if there are several false starts and you have to keep going back to the controller board to change things around.

If Im supplying 6 LED's with 3 volts of power how will it burn the LED's out. It will probably run out of battery quicker but other than that the LED's will still light because there is a power source and the circuit will be made.

LED's in buttons wired in a parallel circuit and then soldered to the rumble pads, or the vibrators, and then the guide button LED's will be also wired in a parallel and these wires will be soldered to the battery pack prongs.

The negative to the positive and positive to negative.Thus completing the circuit for all LED's.

Am I correct?

If not please correct me.

You must be allergic to resistors, but who knows? Maybe the laws of physics will see things your way. Just try it and see if it works.

Not that I'm allergic, just that its just another step I have to do. Another site of soldering and for me just a huge step, too incrompehensible for me, if thats a word. So, are you tellimg me that it wont work? Or are you really tellimg me to try it and see if it works?

LEDs don't want voltage. They want current. The amount of light an LED puts out is proportional to the amount of current flowing through it.  I don't know. If you hook up your LEDs to a voltage source, maybe that'll work. Really what I'm telling you is that I think it won't work. But at the same time why should you believe me? My advice to just try it was sincere too. I mean, should you trust your own eyes?  Or trust some random person on an online forum? How do you find out what works and what doesn't?  Just get in the lab, or your garage or basement or whatever, and try stuff. That's how you learn.

Will do.

I will test it out with some other LED's I have laying around and another controller I have laying around as well.

I would have never thought of testing it out on something else even though it is the obvious thing to do. Thanks.


7 years ago

Well, 2.4V isn't really quite enough to run UV and white LEDs, at least not at full brightness. That might actually be OK, since you really don't want these LEDs to be blinding you while you play. And it's true, if you feed an LED less than its required brightness then you can probably omit the resistor - but it might be good to use a small one in there anyway (10 ohms, even).

As for how and where to mount them, I cannot say. But, as long as you don't interfere with the mechanical movement of the buttons or the electrical connections, you could put the LEDs anywhere. You probably could put holes in the rubber and run wires through.

Alright dude thanks man. So instead of using 2.4 volts, or the wireless rechargeable battery pack which outputs 2.4 volts, I should use the normal one which outputs 3 volts or so. Maybe give the LED's a little more brightness.

Kind of. But I just want mine without resistors if thats possible.

Mmm, if you're following a precedent, the scientific way is to reproduce the previous, then do it again better.
Which one are you looking at with the resistors in it?


http://www.llamma.com/xbox360/mods/xbox%20360%20Controller%20LED%20Mod.htm#Lighting the Dome

This website but again, as mentioned earlier I don't want resistors because I honestly think it makes things a whole lot more complicated