I'm pretty new with electronics and I am building an aquarium controller. I am just working on the lighting at the moment and need to work out how to drive the leds.
I am going to have 30x 3 watt leds in total.
14x cree xp-e cool white
10x blue 3w 700ma 3.5-4v
3x green (not ordered yet but similar to above
3x red again not ordered but similar to above.
To slightly complicate things I want to have individual control of the LEDs e.g. 30 channels, whilst maintaining efficiency, high performance (smoothing dimming with no flickering all the way down to completely off), perhaps some protection thermal, current, spikes etc and finally not too expensive.
I am using a netdino and have 2 TLC5940s daisy chained which provides me with 32 channels of open drain pwm outs.
As I say my knowledge of electronics is somewhat limited and thats what I'm hoping you can help me with.
I know that having multiple leds in a chain would be more efficient, but is there a way I can still achieve a decent level of efficiency with 1 LED per driver?
I have been suggested using the ATTINYs for a driver and I have been trawling the net for a few days trying to find alternative options, but there seem so many options and I just don't know enough to make a decision or to even know what I should look for.
As I say it is important to keep costs down, but I still want to achieve high quality dimming and good efficiency. Also any schematic suggestions would be much appreciated.
Thanks in advance,