I work remotely from Minnesota, but anyways I did somewhat manage to get to 1KHz, but I can't confirm that it was 1KHz, as I don't have an oscilloscope handy, but it appeared to be flickering so fast that it almost seemed steady.
I accomplished that by just using
Do[(
DeviceWrite[arduinoObject,<|pinNumber->1|;
Pause[1/2000];
DeviceWrite[arduinoObject,<|pinNumber->0];
Pause[1/2000]),
{1000}]
However when I wrapped that in Timing, it took about seven seconds to evaluate, and the light would flicker as I mentioned for about twoish seconds (again, don't have an oscilloscope handy, so can't confirm the time), then it would flash on and off for about two more seconds, then after that it would stay steady on either on or off, depending on which time I ran it, i.e. sometimes it would end with being on, sometimes it would end with being off. So that leads me to suspect that Mathematica is either doing stuff after sending the commands that takes seven seconds, or that it is getting "confused" with all the serial output such that it doesn't output correctly, on top of being slower than suspected.
Also, thanks for the tip on Mac serial discovery, I may have to integrate that into the FindDevice functionality!
Ian
