I'm not asking for any schematic/diagram here...just some general discussion/feedback (suggestions)
I'll make/post my Eagle files for 'review' once done...
I want to whip up a custom pcb that is basically a stripped don 'Arduino' with an on-board RGB led (to stick in some lamp project), and an HC-05 bluetooth module embedded.
anyways.. I started to think that using a high powered RGB LED (star) might be better way to go (for maximum brightness)..
the specs for the led are as follows:
Red: 2.5V ~ 3.0V, 350mA
Green: 3.2V ~ 3.8V, 350mA
Blue: 3.2V ~ 3.8V, 350mA
- Star size: 20 x 20 x 1.6mm
- Note: each color channel is able to take a maximum of 350mA of current, thus a 1050mA combined current input and the 3W rating
I have only designed/worked with these RGB led stars in a single channel fashion (1 regulator, 3 x transistors and only one channel/die active at any time, no color mixing).
This time I want to be able to color mix. (so have more than just one single die active at any given time)
Would I just plan on:
* using a 12v wal-wart to power this thing? Is there a better approach here? I not too keen on trying to use a 12v input source that gets chopped down to 5v (or whatever) by the vRegulators
* would I need to use 3 separate vRegulators? one for each color/channel?? (along with 3 transistors..etc)
In general what would the best approach to tackle this with? Any other suggestions?
I'm not very clear/comfortable on making a constant current circuit for this type of set-up..
I had used (which I was told later is not the best approach) an LM317 as my base
I had followed the datasheet and was my first/only constant current anything.
If there is a better way with a different chip that is even easier to set-up (not a bunch of other components needed is a key point for me, along with easy to follow/understand wiring, since I'm just a hobbyist)
the best battery pack, that has enough voltage/current .....that allows for all components (arduino circuit, bt module and rgb led star) voltage drop.... close enough in the vF of the leds (and the vRegulator needs) so it doesnt burn un-needed heat...etc with a nice, EASY chip for making constant current circuit for the led as well..
thoughts? suggestions? feedback?
Thanks in advance!