I'm using two shift registers to control 16 digital outputs using only 3 pins on my microcontroller. The parallel outputs carry <= 20 mA DC, their sole purpose is to power LEDs. My microcontroller pins do the following:
- One is a serial binary data stream (5 or 0 Volts DC). In my case it's a 16 bit periodic pattern which mutates every second.
- One is the input clock pulse for the shift registers. It sends a HIGH pulse for each bit in the data stream. Depending on how I tune the program, the frequency could be anything from 50 Hz to about 16 MHz.
- One is the output latch clock pulse for the shift registers. It sends a HIGH pulse for every 16 bits in the data stream.
Does it matter whether I use solid, multi-stranded or Litz wire in this project?
I've read that the main point of Litz wire is to reduce AC resistance at high frequencies. I suppose nothing here really qualifies as AC, and I'll admit the question is mostly academical. But I'm a bit curious since there are some (possibly) high frequencies involved. This formula and these values from Wikipedia give a skin depth of 65 µm for copper at 1 MHz, so the skin effect certainly is significant, at least for true AC.