Can't Connect to DFPplayer on Arduino Every Board

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I'm curious to know why SoftwareSerial does not work on the Nano Every. Maybe somebody has an idea?

"doesn't seem to work" is always a poor description. Can't you control the player? Do the leds not work? Something else like not compiling?

As said, not familiar with your the components of your setup. Some observations so.

  1. I do get warnings when I compile.
colorWipe(strip.Color(0, 0, 0), 300); // Resets all LEDs to off

colorWipe() takes an uint8_t as the second argument (wait); 300 does not fit in that.

But that argument is not used in the colorWipe(); so that would not be a problem

  1. The description for below is not quite correct; due to delay(0) in the function, it might look like all leds change colour at the same time.
// This function fills the dots one after the other with a color.
void colorWipe(uint32_t c, uint8_t wait) {