Usb serial + DMX serial

Projects General Guidance
1

Demo DMX program works on an Arduino v3.

Trying to add usb serial control from a Jetson doesn't.

Is this an issue of two processes using one serial port?

Will the Arduino Leonardo solve this? What other ways are there around this?

3 
#include <DmxSimple.h>

void setup() {
  DmxSimple.usePin(3); // using digital pin 3 for DMX output

  /* Set up DMX to use Serial0 (the same one that goes to USB on
Arduino UNO and Pro Micro)
     This homemade shield occupies pins 0, 1 (Serial0 - RX, TX) and
pin 4 (for RS485 direction)
     Note: DMX channel set to 512 but you can set to your max required channel
  */
  DmxSimple.maxChannel(512);
  randomSeed(analogRead(0));
}

void loop() {
  for (int ch = 93; ch <= 103; ch++)
  {
    int rand_val = random(0, 256);
    DmxSimple.write(ch, rand_val);
  }
  delay(1000);
}

Here is the working DMX code. I've been through lots of iterations of the version that takes serial commands from the Jetson Nano. I can post some of those attempts, but I'm open to any approach.

Looking at SoftwareSerial now.

6

I'm using the TinkerKit DMX shield.
That doesn't seem to work with R4 right?

Would it work with R3 and SoftwareSerial?