Ok so I need a SUPER SIMPLE circuit to make some digital outputs negative. (Can only use the following: NPN's, PNP's, Resistors, Diodes & VERY Common Capacitors.(All types))
;D ;D ;D -Thank You- ;D ;D ;D ~TECH GEEK~
The question is unclear, what do you mean by negative ? How negative? What is your goal? Where is the Arduino in your equation?
I need to control a RGB LED 43 Cube. I need to control both the 16 columns & the 12 layers(4 Layers w/ each conecting all Red or Green or Blue pins on the same Layer (4 * 3 = 12))
Each column has the 4 RGB LED's Common Anodes conected together. So I plan on on just conecting a few (16) NPN's to each column.
The layers however need a negitve signal and I think that my newly bought Arduino Mega (ATmega1280) provides "POSITIVE 5volt" Signals(High) or "0volt" Signals (Low).
What I need is a "NEGITIVE 5volt" Signal when the output pin is @ (High) or a "0volt" Signal when the output pin is @ (Low).
You have LEDs that drop a Negative voltage?
the 64 RGB leds are in 4 layers & 16 columns
I need to control both the common anode of each LED (by applying a positive voltage to a wire connected to the 4 common anodes of the LEDs in the column.)
to allow individual control of the 4 led's in each colomn I connected all red, all green & all blue pins together to make a layer of conected RGB pins. Then I did this again on the other 3 layers of RGB pins.
I need to control the layers as well by appling a negitive signal to the RED GREEN and/or BLUE wire conecting all the RED pins, all the GREEN pins, & all the BLUE pins on the layer being controled.
see this: http://www.instructables.com/id/The-4x4x4-LED-cube-Arduino/step4/Construct-the-cube/scroll over yellow squares for info
I basicly have same setup as picture
Well the OP shouldn't feel bad or even wrong about using the term 'negative' and we might all lighten up on him a little. It's not the most intuitive, clear, or consistent term used in electronics. If you have say a simple nine volt battery, all would agree to say it has a positive terminal and a negative terminal.
However there is a kind of 'magic' that seems to happen if in a given circuit the batteries 'negative' terminal is wired to the circuits 'common' or 'ground' connection, all of a sudden the name negative seems to go away and we then call it the batteries 'ground' terminal. What we mean by such terms as negative, positive, common, ground, and reference is kind of reliative to the circuit we are talking about. Oh and the magic word negative reappears if we are talking about say a op-amp circuit that is using a three terminal power supply to be able to provide both a negative and positive voltage (in reference to circuit common!). Even formal introductory instructions often don't do a very good job to define these terms in their proper context.
That is why a schematic drawing, a picture really, is indeed worth a thousand words. 
PS: And how in hell can I wire something to ground in my car, it's mounted on four rubber wheels? Oh you don't mean that kind of ground do you? A ground rod and wire was really going to limit where I could drive to.
Lefty
Even formal introductory instructions often don't do a very good job to define these terms in their proper context.
Which is why I always reccommend to newbies to pick up a copy of Grob's "Basic Electronics" and read it; it is defined in great detail there!
ok then how can i make the output pin control a ground source
What would the recomended way be?
A ground rod and wire was really going to limit where I could drive to.
You just need a long enough wire. ;D