Help with code for DS3132 and dfplayer mini combo on Elegoo Uno r3

[markd833]

@anon26492357

static const uint8_t PIN_MP3_RX = 0;  // Connect MP3 TX to Uno's RX (pin 0)
static const uint8_t PIN_MP3_TX = 1;  // Connect MP3 RX to Uno's TX (pin 1)

SoftwareSerial softwareSerial(PIN_MP3_RX, PIN_MP3_TX);

You should use pins other than 0 and 1 for your software serial port as these pins are used by the hardware serial port.