but maybe there is a better way?
I have also been revisiting the idea of running the shift registers at 3.3v instead of 5, reduce the 5vs to 3.3, and resister the data pin so that it gets 3.3v from the arduino. I was thinking maybe having a voltage regulator (like an lm317) drop the voltage from 5 volts to 3.3. Then I would have to resister the red LEDs, and run the other leds on 3.3vIs that a reasonable solution?
maybe i should just order some inexpensive driver chips instead?
but the didnt blow from quick testing 3v.
Is that a reasonable solution?
Told you so,
I see the touch button thing, it looks like they use a photo resistor, and maybe capacitive touch on the other button.
Heres a video of a guy that made circuit boards on glass slides,
so a stack of shift registers,
it was pretty impressive.
Quotebut maybe there is a better way?Yes you have the LEDs, connect them up with something like a 330R resistor and actually measure the forward voltage then you can do the math correctly to get your current.