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putting an LED in a mouse

S

stringcheeseincident

Gawd
Joined
Aug 7, 2003
Messages
807
i have an old logitech 2 button nonscroll ps2 mouse i want to drill holes in and put a LED in. i saw another tutorial where they put a LED in a mouse. they soldered wires directly onto the circuit found in the mouse. i dont know which side of the circuit is ground and which gives power. how can i find out these things? i havent even soldered a LED onto anything, but we do have an electrician friend who can help me. i just need to find out which metal parts of the circuit give out which charges. the markings read

Logitech 99
331115-1001 S15.1
6893-20500 0110A
 
Have you tried testing the red and black wires on the mouse cord with a multimeter? Those might yield +5v, and you can solder a wire from the underside of that white connector, and run it to wherever you need it.
 
i looked on the opposite side of the entire circuit board and there are 4 little pins sticking out right under where the 4 wires go in. do i test those with a multimeter to see if they're getting a charge?
 
Yes, just set your multimeter to dc, around 5 volts, and touch the black lead from the multimeter to the pin on the underside of the board that corresponds to the black wire on the connector. Touch the red lead on your multimeter to the pin under the red wire, and see if the meter reads 5 volts. If it does, then your set, otherwise, check other pins. Chances are it'll be the red and black wires.

Also, be sure to touch only the pins you're trying to test with the multimeter leads, if you accidently touch two pins together, you might short something out.
 
I can't see the back of the board, but consider this an educated guess, since I've done this mod a few times to similar Logitech mice.

Check out the filter cap next to the power supply:
logitech-filter-cap.jpg


I'll bet you a cold one that There's +5V across that cap if you measure with your multimeter. Pop it out and drop the LED + series resistor in its place. If you feel like it, you can also replace the cap in parallel. It's there to make sure the DC power looks like DC. I've found no ill effects from removing them, your mileage may vary.

It's even marked + and - for you. I'm pretty confident there's +5V across it, even without seeing the back of the board.
 
Originally posted by linear
It's there to make sure the DC power looks like DC. I've found no ill effects from removing them, your mileage may vary.
Click to expand...
Most likely it is a filter cap, so it would be unwise to remove it. While it may seem to work now, it might stop working or work intermittently under different situations because of unfiltered power. Lots of ICs don't like unfiltered power, so it would be wiser to keep it.
[edit]Aha! I just saw that you mention that it is probably a filter cap in the beginning of your post. I still stand behind my belief that it is better just to leave it. I HAVE had problems with some ICs working intermittently because of unfiltered power, so I do know that it can be (and is) important to use them to smooth out the supply.[/edit]

Looking here: http://www.shoshin.co.jp/computer/cons/ps2.html
Pin 4 of the PS2 connector is VCC (+5V in this case). Pin 3 is ground.

-special [k]
 
Originally posted by specialk

[edit]Aha! I just saw that you mention that it is probably a filter cap in the beginning of your post. I still stand behind my belief that it is better just to leave it.
Click to expand...

So you probably skimmed past the part where I said
If you feel like it, you can also replace the cap in parallel.
Click to expand...
too.
 
Originally posted by linear
So you probably skimmed past the part where I said
...If you feel like it, you can also replace the cap in parallel...
too.
Click to expand...
No, actually, I did read that. That's why I said:
it would be unwise to remove it
Click to expand...
I would discourage removing the capacitor in the first place (whereas you said to replace it if he felt like it). There would be no harm in keeping the capacitor there in the first place and if anything it would be beneficial.

-special [k]
 
Originally posted by linear
So I think we're agreeing, but I'm really not too sure.
:confused:
Click to expand...
I would agree ;) :p

So... stringcheeseincident, have you done it yet??

-special [k]
 
not yet, i just talked with the electrician guy we know. he said it would probably be easier to just splice the wires on the cable. now i need to find out which wire does which. red is +5v, and black is ground, right? will we need a resistor? what kind of led should i get, and where can i get one? will radioshack be fine? any more help is appreciated.

p.s.: the wires are yellow, orange, red, and black. i know there's a diagram for what pins on the ps2 plug are what, but that doesnt help me with the 4 wires on the other side.
 
You can use this LED Calcukator to find out what resistor to use. Your supply voltage will be 5 volts.

The red and black lines are most likely the ones you want to use. You can check this if you have a voltmeter.
 
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