TL;DR: can you power a low voltage (NiMH cell) charger from the combined PWM output of a HUE lightstrip?
TL:
This is probably a weird one, and I'm just looking to discuss ideas, not for someone else to come up with a design. I don't have any EE friends I can bounce thoughts off..
I would like to design a circuit that can "scavenge" power from an LED light strip (HUE controlled) to power a single LED (~25mA) - it will turn on when the strip turns off, that part I have worked out, no different than a solar powered accent light.
The part I would like to discuss is harvesting power from the PWM LED strip (it's a 5-wire W/R/G/B/Gnd, but I also have 4-wire (R/G/B/Gnd) that I might end up using. That part isn't important. I'd like it to be adaptable/universal. Could be 12V, could be 5V, it's all much more than the charge voltage needed.
I am thinking just using diodes from each channel, feeding a moderate cap., from which a simple charge circuit operates. The output feeds a single LED. Just describing it, it sounds like it should work just fine. Again, just looking to discuss with like-minded folk.
Much more TL:As some will probably wonder, I just need to project a small circle of light from the top of a cabinet (where the LED strip resides) across a room to illuminate a wall clock when lights go out. The clock already has AC power, but the design prevents illuminating the hands. The mechanics using a focusable head from a 1.5V LED flashlight works perfectly. Yes, I could just power the LED from AC, but I like making/designing, and this seems more elegant. No, there's no elegant way to illuminate the hands from the clock - I already have an LED strip surround (that's why it's powered..)
TL:
This is probably a weird one, and I'm just looking to discuss ideas, not for someone else to come up with a design. I don't have any EE friends I can bounce thoughts off..
I would like to design a circuit that can "scavenge" power from an LED light strip (HUE controlled) to power a single LED (~25mA) - it will turn on when the strip turns off, that part I have worked out, no different than a solar powered accent light.
The part I would like to discuss is harvesting power from the PWM LED strip (it's a 5-wire W/R/G/B/Gnd, but I also have 4-wire (R/G/B/Gnd) that I might end up using. That part isn't important. I'd like it to be adaptable/universal. Could be 12V, could be 5V, it's all much more than the charge voltage needed.
I am thinking just using diodes from each channel, feeding a moderate cap., from which a simple charge circuit operates. The output feeds a single LED. Just describing it, it sounds like it should work just fine. Again, just looking to discuss with like-minded folk.
Much more TL:As some will probably wonder, I just need to project a small circle of light from the top of a cabinet (where the LED strip resides) across a room to illuminate a wall clock when lights go out. The clock already has AC power, but the design prevents illuminating the hands. The mechanics using a focusable head from a 1.5V LED flashlight works perfectly. Yes, I could just power the LED from AC, but I like making/designing, and this seems more elegant. No, there's no elegant way to illuminate the hands from the clock - I already have an LED strip surround (that's why it's powered..)
