Should I add a decoupling capacitor to my RGB 16x32 LED matrix powered directly via the 5V pin?
When I display a spectrogram, the current load is fluctuating quickly in the 100-250 mA range (on average, the full range is 50-300 mA).
If yes, which capacitor should I pick for this purpose?
I have 0.01 μF, 0.1 μF ceramic and 1 μF, 2.2 μF, 4.7 μF, 10 μF, 100 μF electrolytic caps.
EDIT: I'm also interested to know about this WS2812B LED strip i've connected to the 5 V pin to another Arduino.
After reducing the brightness it has similar current consumption and fluctuation of the LED matrix.
In this tutorial they suggest to add a 1000 μF cap, but in my case the currents are much smaller.