I would like to make a bright light, with 5-10 3W RGBLEDS connected in series (these ones).
I have a 24V 1.5A AC adapter that plugs into the wall, to give me a constant current and voltage...
I'm thinking of how I could make this work, and I'm a real newbie to doing anything outside of just connecting things straight to the arduino and connecting the arduio to my PC, so I'm really not sure of some things, and I don't know if this will work. I'm thinking that maybe, I could connect the arduino in parallel with something like the L7805CV to drop the voltage from 24V to 5V, and have the arduino control 3 variable resistors hooked up to the other branch of the circuit, that feed into the each RGBLED pin. That way I could vary the voltage as needed to alter the colors. I am planning on connecting multiple of these RGBLEDS in series so that I'm not pumping 24V straight into the pins... But I have some areas where I'm confused.
- I see online that the different pins for R,G and B require different resistors on account of the differing forward voltages of the different colors. Could I just account for that in my variable resistors and not bother with the resistors in front of the LEDS?
- Very similar to my first question, but still something I need specific clarification on: Do I need to have a resistor like this before each RGBLED, or can I just use the variable resistor at the start?
- I see that these LEDS require a driver. I don't know how to use one, but I can find out.. Unless I don't need one because of my constant 24V current adapter. Is this the case, or do I still need a driver? If so, which one would suit my purposes?
Is there anything I haven't considered that would derail this whole project?
As far as the programming goes, I am a programmer and can manage. I really just need help with the physical setup.
Any help would be greatly appreciated.