The sketch used in the demo is posted below
#include "TrinketFakeUsbSerial.h" void setup() { TFUSerial.begin(); } void loop() { TFUSerial.task(); // this should be called at least once every 10 ms if (TFUSerial.available()) { char c = TFUSerial.read(); if (c == 'a') { TFUSerial.println("hello world"); } else if (c == 'b') { TFUSerial.println(millis(), DEC); } } }